The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Yoshinori Ikoma - One of the best experts on this subject based on the ideXlab platform.
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abscisic acid affects expression of citrus ft homologs upon Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Tree Physiology, 2018Co-Authors: Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Yoshinori Ikoma, Yumi Nakata, Hikaru Matsumoto, Naoko Nakajima, Mitsuo OmuraAbstract:: After a long juvenile period, citrus trees undergo seasonal flowering cycles. Under natural conditions, citrus flowering is regulated mainly by low ambient temperatures around 15-20 °C and water deficit stress. Recent studies have revealed that fluctuations in the expression of citrus homologs of FLOWERING LOCUS T (FT, encoding a flowering integrator) are correlated with their presumed role as flower-promoting signals. Previous ectopic expression analyses have demonstrated the flower-promoting function of citrus FT homologs. In this study, we examined whether abscisic acid (ABA) affects the expression of FT homologs and the flowering induced by low ambient temperatures. Application of exogenous ABA to potted Satsuma mandarin (Citrus unshiu Marc.) trees resulted in transient accumulation of citrus FT homolog transcripts. The promoter of one citrus FT homolog, CiFT3, was active in transgenic A. thaliana (Arabidopsis thaliana) and responded to exogenous and endogenous ABA. CiFT3 is preferentially expressed in shoots, and its expression was affected by flower-inductive treatments. Endogenous ABA accumulated in mandarin shoots during the Floral Induction period at 15 °C and under field conditions. The accumulation of ABA was correlated with the accumulation of FT homolog transcripts and flowering intensity. It was consistent with changes in the expression of genes related to ABA metabolism. The abundance of carotenoid precursors that serve as substrates for ABA biosynthesis decreased in leaves during the accumulation of ABA. Our data indicate that ABA and carotenoid precursors in leaves influence the flowering of mandarin trees induced by low temperature.
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increased cift abundance in the stem correlates with Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Journal of Experimental Botany, 2007Co-Authors: Fumie Nishikawa, Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Tokurou Shimizu, Mitsuo Omura, Yoshinori IkomaAbstract:After several years in the juvenile phase, adult citrus trees show seasonal periodicity of flowering. A prolonged exposure to low temperature is one of the most important environmental cues for Floral Induction in citrus. In the present study, the expression of floweringrelated genes during the annual cycle of flowering and inductive low-temperature treatment in Satsuma mandarin (Citrus unshiu Marc.) trees is investigated. Simultaneously, Floral Induction, which occurs before the period of morphological flower development, was estimated as the number of flowers after the forcing of sprouting by defoliation at 25 � C. The expression of citrus FLOWERING LOCUS T homologues, CiFT, showed a seasonal increase during the Floral Induction period and was also induced by an artificial lowtemperature treatment (15 � C) at which Floral Induction occurred. By contrast, the mRNA level of CiFT did not show any distinct changes following a warmtemperature treatment (25 � C) for 2.5 months, during which time Floral Induction was completely suppressed. Changes in the expression of the citrus homologues of TERMINAL FLOWER 1, LEAFY, and APETALA1 did not show any correlation with Floral Induction in the field or under artificial low-temperature conditions. In juvenile seedlings of Satsuma mandarin, which does not flower even under inductive low-temperature conditions, the mRNA levels of CiFT were not affected by the low-temperature treatment, unlike adult tissues. These results suggest that low temperature promotes Floral Induction via the activation of CiFT transcription in adult Satsuma mandarin trees and that, in the juvenile plant, CiFT transcription does not respond to low temperature.
Mitsuo Omura - One of the best experts on this subject based on the ideXlab platform.
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abscisic acid affects expression of citrus ft homologs upon Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Tree Physiology, 2018Co-Authors: Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Yoshinori Ikoma, Yumi Nakata, Hikaru Matsumoto, Naoko Nakajima, Mitsuo OmuraAbstract:: After a long juvenile period, citrus trees undergo seasonal flowering cycles. Under natural conditions, citrus flowering is regulated mainly by low ambient temperatures around 15-20 °C and water deficit stress. Recent studies have revealed that fluctuations in the expression of citrus homologs of FLOWERING LOCUS T (FT, encoding a flowering integrator) are correlated with their presumed role as flower-promoting signals. Previous ectopic expression analyses have demonstrated the flower-promoting function of citrus FT homologs. In this study, we examined whether abscisic acid (ABA) affects the expression of FT homologs and the flowering induced by low ambient temperatures. Application of exogenous ABA to potted Satsuma mandarin (Citrus unshiu Marc.) trees resulted in transient accumulation of citrus FT homolog transcripts. The promoter of one citrus FT homolog, CiFT3, was active in transgenic A. thaliana (Arabidopsis thaliana) and responded to exogenous and endogenous ABA. CiFT3 is preferentially expressed in shoots, and its expression was affected by flower-inductive treatments. Endogenous ABA accumulated in mandarin shoots during the Floral Induction period at 15 °C and under field conditions. The accumulation of ABA was correlated with the accumulation of FT homolog transcripts and flowering intensity. It was consistent with changes in the expression of genes related to ABA metabolism. The abundance of carotenoid precursors that serve as substrates for ABA biosynthesis decreased in leaves during the accumulation of ABA. Our data indicate that ABA and carotenoid precursors in leaves influence the flowering of mandarin trees induced by low temperature.
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increased cift abundance in the stem correlates with Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Journal of Experimental Botany, 2007Co-Authors: Fumie Nishikawa, Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Tokurou Shimizu, Mitsuo Omura, Yoshinori IkomaAbstract:After several years in the juvenile phase, adult citrus trees show seasonal periodicity of flowering. A prolonged exposure to low temperature is one of the most important environmental cues for Floral Induction in citrus. In the present study, the expression of floweringrelated genes during the annual cycle of flowering and inductive low-temperature treatment in Satsuma mandarin (Citrus unshiu Marc.) trees is investigated. Simultaneously, Floral Induction, which occurs before the period of morphological flower development, was estimated as the number of flowers after the forcing of sprouting by defoliation at 25 � C. The expression of citrus FLOWERING LOCUS T homologues, CiFT, showed a seasonal increase during the Floral Induction period and was also induced by an artificial lowtemperature treatment (15 � C) at which Floral Induction occurred. By contrast, the mRNA level of CiFT did not show any distinct changes following a warmtemperature treatment (25 � C) for 2.5 months, during which time Floral Induction was completely suppressed. Changes in the expression of the citrus homologues of TERMINAL FLOWER 1, LEAFY, and APETALA1 did not show any correlation with Floral Induction in the field or under artificial low-temperature conditions. In juvenile seedlings of Satsuma mandarin, which does not flower even under inductive low-temperature conditions, the mRNA levels of CiFT were not affected by the low-temperature treatment, unlike adult tissues. These results suggest that low temperature promotes Floral Induction via the activation of CiFT transcription in adult Satsuma mandarin trees and that, in the juvenile plant, CiFT transcription does not respond to low temperature.
Tomoko Endo - One of the best experts on this subject based on the ideXlab platform.
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abscisic acid affects expression of citrus ft homologs upon Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Tree Physiology, 2018Co-Authors: Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Yoshinori Ikoma, Yumi Nakata, Hikaru Matsumoto, Naoko Nakajima, Mitsuo OmuraAbstract:: After a long juvenile period, citrus trees undergo seasonal flowering cycles. Under natural conditions, citrus flowering is regulated mainly by low ambient temperatures around 15-20 °C and water deficit stress. Recent studies have revealed that fluctuations in the expression of citrus homologs of FLOWERING LOCUS T (FT, encoding a flowering integrator) are correlated with their presumed role as flower-promoting signals. Previous ectopic expression analyses have demonstrated the flower-promoting function of citrus FT homologs. In this study, we examined whether abscisic acid (ABA) affects the expression of FT homologs and the flowering induced by low ambient temperatures. Application of exogenous ABA to potted Satsuma mandarin (Citrus unshiu Marc.) trees resulted in transient accumulation of citrus FT homolog transcripts. The promoter of one citrus FT homolog, CiFT3, was active in transgenic A. thaliana (Arabidopsis thaliana) and responded to exogenous and endogenous ABA. CiFT3 is preferentially expressed in shoots, and its expression was affected by flower-inductive treatments. Endogenous ABA accumulated in mandarin shoots during the Floral Induction period at 15 °C and under field conditions. The accumulation of ABA was correlated with the accumulation of FT homolog transcripts and flowering intensity. It was consistent with changes in the expression of genes related to ABA metabolism. The abundance of carotenoid precursors that serve as substrates for ABA biosynthesis decreased in leaves during the accumulation of ABA. Our data indicate that ABA and carotenoid precursors in leaves influence the flowering of mandarin trees induced by low temperature.
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increased cift abundance in the stem correlates with Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Journal of Experimental Botany, 2007Co-Authors: Fumie Nishikawa, Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Tokurou Shimizu, Mitsuo Omura, Yoshinori IkomaAbstract:After several years in the juvenile phase, adult citrus trees show seasonal periodicity of flowering. A prolonged exposure to low temperature is one of the most important environmental cues for Floral Induction in citrus. In the present study, the expression of floweringrelated genes during the annual cycle of flowering and inductive low-temperature treatment in Satsuma mandarin (Citrus unshiu Marc.) trees is investigated. Simultaneously, Floral Induction, which occurs before the period of morphological flower development, was estimated as the number of flowers after the forcing of sprouting by defoliation at 25 � C. The expression of citrus FLOWERING LOCUS T homologues, CiFT, showed a seasonal increase during the Floral Induction period and was also induced by an artificial lowtemperature treatment (15 � C) at which Floral Induction occurred. By contrast, the mRNA level of CiFT did not show any distinct changes following a warmtemperature treatment (25 � C) for 2.5 months, during which time Floral Induction was completely suppressed. Changes in the expression of the citrus homologues of TERMINAL FLOWER 1, LEAFY, and APETALA1 did not show any correlation with Floral Induction in the field or under artificial low-temperature conditions. In juvenile seedlings of Satsuma mandarin, which does not flower even under inductive low-temperature conditions, the mRNA levels of CiFT were not affected by the low-temperature treatment, unlike adult tissues. These results suggest that low temperature promotes Floral Induction via the activation of CiFT transcription in adult Satsuma mandarin trees and that, in the juvenile plant, CiFT transcription does not respond to low temperature.
Hiroshi Fujii - One of the best experts on this subject based on the ideXlab platform.
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abscisic acid affects expression of citrus ft homologs upon Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Tree Physiology, 2018Co-Authors: Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Yoshinori Ikoma, Yumi Nakata, Hikaru Matsumoto, Naoko Nakajima, Mitsuo OmuraAbstract:: After a long juvenile period, citrus trees undergo seasonal flowering cycles. Under natural conditions, citrus flowering is regulated mainly by low ambient temperatures around 15-20 °C and water deficit stress. Recent studies have revealed that fluctuations in the expression of citrus homologs of FLOWERING LOCUS T (FT, encoding a flowering integrator) are correlated with their presumed role as flower-promoting signals. Previous ectopic expression analyses have demonstrated the flower-promoting function of citrus FT homologs. In this study, we examined whether abscisic acid (ABA) affects the expression of FT homologs and the flowering induced by low ambient temperatures. Application of exogenous ABA to potted Satsuma mandarin (Citrus unshiu Marc.) trees resulted in transient accumulation of citrus FT homolog transcripts. The promoter of one citrus FT homolog, CiFT3, was active in transgenic A. thaliana (Arabidopsis thaliana) and responded to exogenous and endogenous ABA. CiFT3 is preferentially expressed in shoots, and its expression was affected by flower-inductive treatments. Endogenous ABA accumulated in mandarin shoots during the Floral Induction period at 15 °C and under field conditions. The accumulation of ABA was correlated with the accumulation of FT homolog transcripts and flowering intensity. It was consistent with changes in the expression of genes related to ABA metabolism. The abundance of carotenoid precursors that serve as substrates for ABA biosynthesis decreased in leaves during the accumulation of ABA. Our data indicate that ABA and carotenoid precursors in leaves influence the flowering of mandarin trees induced by low temperature.
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increased cift abundance in the stem correlates with Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Journal of Experimental Botany, 2007Co-Authors: Fumie Nishikawa, Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Tokurou Shimizu, Mitsuo Omura, Yoshinori IkomaAbstract:After several years in the juvenile phase, adult citrus trees show seasonal periodicity of flowering. A prolonged exposure to low temperature is one of the most important environmental cues for Floral Induction in citrus. In the present study, the expression of floweringrelated genes during the annual cycle of flowering and inductive low-temperature treatment in Satsuma mandarin (Citrus unshiu Marc.) trees is investigated. Simultaneously, Floral Induction, which occurs before the period of morphological flower development, was estimated as the number of flowers after the forcing of sprouting by defoliation at 25 � C. The expression of citrus FLOWERING LOCUS T homologues, CiFT, showed a seasonal increase during the Floral Induction period and was also induced by an artificial lowtemperature treatment (15 � C) at which Floral Induction occurred. By contrast, the mRNA level of CiFT did not show any distinct changes following a warmtemperature treatment (25 � C) for 2.5 months, during which time Floral Induction was completely suppressed. Changes in the expression of the citrus homologues of TERMINAL FLOWER 1, LEAFY, and APETALA1 did not show any correlation with Floral Induction in the field or under artificial low-temperature conditions. In juvenile seedlings of Satsuma mandarin, which does not flower even under inductive low-temperature conditions, the mRNA levels of CiFT were not affected by the low-temperature treatment, unlike adult tissues. These results suggest that low temperature promotes Floral Induction via the activation of CiFT transcription in adult Satsuma mandarin trees and that, in the juvenile plant, CiFT transcription does not respond to low temperature.
Takehiko Shimada - One of the best experts on this subject based on the ideXlab platform.
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abscisic acid affects expression of citrus ft homologs upon Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Tree Physiology, 2018Co-Authors: Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Yoshinori Ikoma, Yumi Nakata, Hikaru Matsumoto, Naoko Nakajima, Mitsuo OmuraAbstract:: After a long juvenile period, citrus trees undergo seasonal flowering cycles. Under natural conditions, citrus flowering is regulated mainly by low ambient temperatures around 15-20 °C and water deficit stress. Recent studies have revealed that fluctuations in the expression of citrus homologs of FLOWERING LOCUS T (FT, encoding a flowering integrator) are correlated with their presumed role as flower-promoting signals. Previous ectopic expression analyses have demonstrated the flower-promoting function of citrus FT homologs. In this study, we examined whether abscisic acid (ABA) affects the expression of FT homologs and the flowering induced by low ambient temperatures. Application of exogenous ABA to potted Satsuma mandarin (Citrus unshiu Marc.) trees resulted in transient accumulation of citrus FT homolog transcripts. The promoter of one citrus FT homolog, CiFT3, was active in transgenic A. thaliana (Arabidopsis thaliana) and responded to exogenous and endogenous ABA. CiFT3 is preferentially expressed in shoots, and its expression was affected by flower-inductive treatments. Endogenous ABA accumulated in mandarin shoots during the Floral Induction period at 15 °C and under field conditions. The accumulation of ABA was correlated with the accumulation of FT homolog transcripts and flowering intensity. It was consistent with changes in the expression of genes related to ABA metabolism. The abundance of carotenoid precursors that serve as substrates for ABA biosynthesis decreased in leaves during the accumulation of ABA. Our data indicate that ABA and carotenoid precursors in leaves influence the flowering of mandarin trees induced by low temperature.
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increased cift abundance in the stem correlates with Floral Induction by low temperature in satsuma mandarin citrus unshiu marc
Journal of Experimental Botany, 2007Co-Authors: Fumie Nishikawa, Tomoko Endo, Takehiko Shimada, Hiroshi Fujii, Tokurou Shimizu, Mitsuo Omura, Yoshinori IkomaAbstract:After several years in the juvenile phase, adult citrus trees show seasonal periodicity of flowering. A prolonged exposure to low temperature is one of the most important environmental cues for Floral Induction in citrus. In the present study, the expression of floweringrelated genes during the annual cycle of flowering and inductive low-temperature treatment in Satsuma mandarin (Citrus unshiu Marc.) trees is investigated. Simultaneously, Floral Induction, which occurs before the period of morphological flower development, was estimated as the number of flowers after the forcing of sprouting by defoliation at 25 � C. The expression of citrus FLOWERING LOCUS T homologues, CiFT, showed a seasonal increase during the Floral Induction period and was also induced by an artificial lowtemperature treatment (15 � C) at which Floral Induction occurred. By contrast, the mRNA level of CiFT did not show any distinct changes following a warmtemperature treatment (25 � C) for 2.5 months, during which time Floral Induction was completely suppressed. Changes in the expression of the citrus homologues of TERMINAL FLOWER 1, LEAFY, and APETALA1 did not show any correlation with Floral Induction in the field or under artificial low-temperature conditions. In juvenile seedlings of Satsuma mandarin, which does not flower even under inductive low-temperature conditions, the mRNA levels of CiFT were not affected by the low-temperature treatment, unlike adult tissues. These results suggest that low temperature promotes Floral Induction via the activation of CiFT transcription in adult Satsuma mandarin trees and that, in the juvenile plant, CiFT transcription does not respond to low temperature.