The Experts below are selected from a list of 69084 Experts worldwide ranked by ideXlab platform
E.vanilla Kumari - One of the best experts on this subject based on the ideXlab platform.
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Seasonal Growth, Phenology and Spore Shedding in Polysiphonia platycarpa Børgesen (Ceramiales, Rhodophyta) of Visakhapatnam Coast, India
ALGAE, 2003Co-Authors: G Subba Rangaiah, S. Sudhakar, E.vanilla KumariAbstract:Variation in Seasonal Growth, phenology and periodicity in spore shedding in Polysiphonia platycarpa occurring on the coast of Visakhapatnam, India, have been described to know the Growth behaviour, reproductive periodicity and spore producing capacities. This alga occurs for a short period from December to May in the intertidal region of the Visakhapatnam coast, showing maximum Growth during January/February. Tetrasporophytic, carposporophytic and antheridial plants were observed in all months of their occurrence in the field. But the vegetative plants were not seen in January and February and all the plants collected were reproductive. The tetraspore and carpospore shedding was observed during all the six months of their occurrence.
G Subba Rangaiah - One of the best experts on this subject based on the ideXlab platform.
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Seasonal Growth, Phenology and Spore Shedding in Polysiphonia platycarpa Børgesen (Ceramiales, Rhodophyta) of Visakhapatnam Coast, India
ALGAE, 2003Co-Authors: G Subba Rangaiah, S. Sudhakar, E.vanilla KumariAbstract:Variation in Seasonal Growth, phenology and periodicity in spore shedding in Polysiphonia platycarpa occurring on the coast of Visakhapatnam, India, have been described to know the Growth behaviour, reproductive periodicity and spore producing capacities. This alga occurs for a short period from December to May in the intertidal region of the Visakhapatnam coast, showing maximum Growth during January/February. Tetrasporophytic, carposporophytic and antheridial plants were observed in all months of their occurrence in the field. But the vegetative plants were not seen in January and February and all the plants collected were reproductive. The tetraspore and carpospore shedding was observed during all the six months of their occurrence.
Derek H. Ogle - One of the best experts on this subject based on the ideXlab platform.
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A technical note on Seasonal Growth models
Reviews in Fish Biology and Fisheries, 2012Co-Authors: Emili García-berthou, Gerard Carmona-catot, Roberto Merciai, Derek H. OgleAbstract:The Growth of many organisms is Seasonal, with a dependence on variation in temperature, light, and food availability. A Growth model proposed by Somers (Fishbyte 6:8–11, 1988) is one of the most widely used models to describe Seasonal Growth. We point out that three different formulae (beyond numerous typographical errors) have been used in the literature referring to Somers (Fishbyte 6:8–11, 1988). These formulae correspond to different curves and yield different parameter estimates with different biological interpretations. These inconsistencies have led to the wrong identification of the period of lowest Growth rate (winter point) in some papers of the literature. We urge authors to carefully edit their formulae to assure use of the original definition in Somers (Fishbyte 6:8–11, 1988).
S. Sudhakar - One of the best experts on this subject based on the ideXlab platform.
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Seasonal Growth, Phenology and Spore Shedding in Polysiphonia platycarpa Børgesen (Ceramiales, Rhodophyta) of Visakhapatnam Coast, India
ALGAE, 2003Co-Authors: G Subba Rangaiah, S. Sudhakar, E.vanilla KumariAbstract:Variation in Seasonal Growth, phenology and periodicity in spore shedding in Polysiphonia platycarpa occurring on the coast of Visakhapatnam, India, have been described to know the Growth behaviour, reproductive periodicity and spore producing capacities. This alga occurs for a short period from December to May in the intertidal region of the Visakhapatnam coast, showing maximum Growth during January/February. Tetrasporophytic, carposporophytic and antheridial plants were observed in all months of their occurrence in the field. But the vegetative plants were not seen in January and February and all the plants collected were reproductive. The tetraspore and carpospore shedding was observed during all the six months of their occurrence.
Gideon Grafi - One of the best experts on this subject based on the ideXlab platform.
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Seasonal Growth of Zygophyllum dumosum Boiss.: Summer Dormancy Is Associated with Loss of the Permissive Epigenetic Marker Dimethyl H3K4 and Extensive Reduction in Proteins Involved in Basic Cell Functions
Plants (Basel Switzerland), 2018Co-Authors: Janardan Khadka, Narendra Singh Yadav, Gila Granot, Gideon GrafiAbstract:Plants thriving in desert environments are suitable for studying mechanisms for plant survival under extreme Seasonal climate variation. We studied epigenetic mechanisms underlying Seasonal Growth cycles in the desert plant Zygophyllum dumosum Boiss., which was previously shown to be deficient in repressive markers of di-methyl and tri-methyl H3K9 and their association with factors regulating basic cell functions. We showed a contingent association between rainfall and Seasonal Growth and the epigenetic marker of dimethyl H3K4, which disappears upon entry into the dry season and the acquisition of a dormant state. DNA methylation is not affected by a lack of H3K9 di-methyl and tri-methyl. Changes in methylation can occur between the wet and dry season. Proteome analysis of acid soluble fractions revealed an extensive reduction in ribosomal proteins and in proteins involved in chloroplasts and mitochondrial activities during the dry seasons concomitantly with up-regulation of molecular chaperone HSPs. Our results highlight mechanisms underlying Z. dumosum adaptation to Seasonal climate variation. Particularly, summer dormancy is associated with a loss of the permissive epigenetic marker dimethyl H3K4, which might facilitate genome compaction concomitantly with a significant reduction in proteins involved in basic cell functions. HSP chaperones might safeguard the integrity of cell components.
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Seasonal Growth of Zygophyllum dumosum Boiss.: Summer Dormancy is Associated with Loss of the Permissive Epigenetic Marker Dimethyl H3K4 and Extensive Reduction in Proteins Involved in Basic Cell Functions
2018Co-Authors: Janardan Khadka, Narendra Singh Yadav, Gila Granot, Gideon GrafiAbstract:Plants thriving in desert environments are suitable for studying mechanisms for plant survival under extreme Seasonal climate variation. Zygophyllum dumosum Boiss, like many other Zygophyllaceae species, displays a unique epigenetic mechanism whereby the repressive markers di- and tri-methyl of H3K9 do not exist. We studied epigenetic mechanisms underlying Seasonal Growth cycles in Z. dumosum and their association with factors regulating basic cell functions. We showed strong association between rainfall and Seasonal Growth and the epigenetic marker of dimethyl H3K4, which disappears on entry into the dry season and the acquisition of dormant state. DNA methylation is not affected by lack of H3K9 di and tri methyl and changes in methylation pattern are apparent on entry into the dry season. Proteome analysis of acid soluble fractions revealed extensive reduction in ribosomal proteins and in proteins involved in chloroplasts and mitochondria activities during the dry seasons concomitantly with up-regulation of molecular chaperone HSPs. Our results highlight mechanisms underlying Z. dumosum adaptation to Seasonal climate variation. Particularly, summer dormancy is associated with loss of the permissive epigenetic marker dimethyl H3K4, which might facilitate genome compaction, concomitantly with significant reduction in proteins involved in basic cell functions (i.e., protein synthesis, photosynthesis and respiration).
