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Tatsuya M. Ikeda - One of the best experts on this subject based on the ideXlab platform.

  • exogenous methyl jasmonate alters trichome density on leaf surfaces of rhodes grass chloris gayana kunth
    Journal of Plant Growth Regulation, 2010
    Co-Authors: Hidekazu Kobayashi, Mikiko Yanaka, Tatsuya M. Ikeda
    Abstract:

    Jasmonates, including jasmonic acid and its derivatives such as methyl jasmonate (MeJA), are Plant Growth Substances that control various responses. Jasmonates regulate leaf trichome density in dicotyledonous Plants, but their effects on the trichome density of monocotyledonous Plants, such as those in the Poaceae, remain unclear. In the present study we examined the effects of exogenous MeJA on the trichome density of Rhodes grass, which has three kinds of trichomes: macrohairs, salt glands, and prickles. Exogenous MeJA significantly increased the densities of macrohairs and salt glands on the adaxial and abaxial leaf surfaces and those of prickles on the adaxial leaf surface. Because exogenous MeJA significantly reduced the leaf area, we calculated the number of trichomes per 1000 epidermal cells to eliminate the effects of reduced leaf area. Exogenous MeJA significantly increased the number of macrohairs per 1000 epidermal cells on both adaxial and abaxial leaf surfaces, but it significantly decreased the number of salt glands per 1000 epidermal cells on both surfaces. Exogenous MeJA had no significant effects on the number of prickles per 1000 epidermal cells on either of the leaf surfaces. These results indicate that exogenous MeJA alters the trichome density by affecting leaf area and trichome initiation, and the effects of exogenous MeJA on trichome initiation differ among the various trichome types.

  • exogenous methyl jasmonate alters trichome density on leaf surfaces of rhodes grass chloris gayana kunth
    Journal of Plant Growth Regulation, 2010
    Co-Authors: Hidekazu Kobayashi, Mikiko Yanaka, Tatsuya M. Ikeda
    Abstract:

    Jasmonates, including jasmonic acid and its derivatives such as methyl jasmonate (MeJA), are Plant Growth Substances that control various responses. Jasmonates regulate leaf trichome density in dicotyledonous Plants, but their effects on the trichome density of monocotyledonous Plants, such as those in the Poaceae, remain unclear. In the present study we examined the effects of exogenous MeJA on the trichome density of Rhodes grass, which has three kinds of trichomes: macrohairs, salt glands, and prickles. Exogenous MeJA significantly increased the densities of macrohairs and salt glands on the adaxial and abaxial leaf surfaces and those of prickles on the adaxial leaf surface. Because exogenous MeJA significantly reduced the leaf area, we calculated the number of trichomes per 1000 epidermal cells to eliminate the effects of reduced leaf area. Exogenous MeJA significantly increased the number of macrohairs per 1000 epidermal cells on both adaxial and abaxial leaf surfaces, but it significantly decreased the number of salt glands per 1000 epidermal cells on both surfaces. Exogenous MeJA had no significant effects on the number of prickles per 1000 epidermal cells on either of the leaf surfaces. These results indicate that exogenous MeJA alters the trichome density by affecting leaf area and trichome initiation, and the effects of exogenous MeJA on trichome initiation differ among the various trichome types.

Hidekazu Kobayashi - One of the best experts on this subject based on the ideXlab platform.

  • exogenous methyl jasmonate alters trichome density on leaf surfaces of rhodes grass chloris gayana kunth
    Journal of Plant Growth Regulation, 2010
    Co-Authors: Hidekazu Kobayashi, Mikiko Yanaka, Tatsuya M. Ikeda
    Abstract:

    Jasmonates, including jasmonic acid and its derivatives such as methyl jasmonate (MeJA), are Plant Growth Substances that control various responses. Jasmonates regulate leaf trichome density in dicotyledonous Plants, but their effects on the trichome density of monocotyledonous Plants, such as those in the Poaceae, remain unclear. In the present study we examined the effects of exogenous MeJA on the trichome density of Rhodes grass, which has three kinds of trichomes: macrohairs, salt glands, and prickles. Exogenous MeJA significantly increased the densities of macrohairs and salt glands on the adaxial and abaxial leaf surfaces and those of prickles on the adaxial leaf surface. Because exogenous MeJA significantly reduced the leaf area, we calculated the number of trichomes per 1000 epidermal cells to eliminate the effects of reduced leaf area. Exogenous MeJA significantly increased the number of macrohairs per 1000 epidermal cells on both adaxial and abaxial leaf surfaces, but it significantly decreased the number of salt glands per 1000 epidermal cells on both surfaces. Exogenous MeJA had no significant effects on the number of prickles per 1000 epidermal cells on either of the leaf surfaces. These results indicate that exogenous MeJA alters the trichome density by affecting leaf area and trichome initiation, and the effects of exogenous MeJA on trichome initiation differ among the various trichome types.

  • exogenous methyl jasmonate alters trichome density on leaf surfaces of rhodes grass chloris gayana kunth
    Journal of Plant Growth Regulation, 2010
    Co-Authors: Hidekazu Kobayashi, Mikiko Yanaka, Tatsuya M. Ikeda
    Abstract:

    Jasmonates, including jasmonic acid and its derivatives such as methyl jasmonate (MeJA), are Plant Growth Substances that control various responses. Jasmonates regulate leaf trichome density in dicotyledonous Plants, but their effects on the trichome density of monocotyledonous Plants, such as those in the Poaceae, remain unclear. In the present study we examined the effects of exogenous MeJA on the trichome density of Rhodes grass, which has three kinds of trichomes: macrohairs, salt glands, and prickles. Exogenous MeJA significantly increased the densities of macrohairs and salt glands on the adaxial and abaxial leaf surfaces and those of prickles on the adaxial leaf surface. Because exogenous MeJA significantly reduced the leaf area, we calculated the number of trichomes per 1000 epidermal cells to eliminate the effects of reduced leaf area. Exogenous MeJA significantly increased the number of macrohairs per 1000 epidermal cells on both adaxial and abaxial leaf surfaces, but it significantly decreased the number of salt glands per 1000 epidermal cells on both surfaces. Exogenous MeJA had no significant effects on the number of prickles per 1000 epidermal cells on either of the leaf surfaces. These results indicate that exogenous MeJA alters the trichome density by affecting leaf area and trichome initiation, and the effects of exogenous MeJA on trichome initiation differ among the various trichome types.

Mikiko Yanaka - One of the best experts on this subject based on the ideXlab platform.

  • exogenous methyl jasmonate alters trichome density on leaf surfaces of rhodes grass chloris gayana kunth
    Journal of Plant Growth Regulation, 2010
    Co-Authors: Hidekazu Kobayashi, Mikiko Yanaka, Tatsuya M. Ikeda
    Abstract:

    Jasmonates, including jasmonic acid and its derivatives such as methyl jasmonate (MeJA), are Plant Growth Substances that control various responses. Jasmonates regulate leaf trichome density in dicotyledonous Plants, but their effects on the trichome density of monocotyledonous Plants, such as those in the Poaceae, remain unclear. In the present study we examined the effects of exogenous MeJA on the trichome density of Rhodes grass, which has three kinds of trichomes: macrohairs, salt glands, and prickles. Exogenous MeJA significantly increased the densities of macrohairs and salt glands on the adaxial and abaxial leaf surfaces and those of prickles on the adaxial leaf surface. Because exogenous MeJA significantly reduced the leaf area, we calculated the number of trichomes per 1000 epidermal cells to eliminate the effects of reduced leaf area. Exogenous MeJA significantly increased the number of macrohairs per 1000 epidermal cells on both adaxial and abaxial leaf surfaces, but it significantly decreased the number of salt glands per 1000 epidermal cells on both surfaces. Exogenous MeJA had no significant effects on the number of prickles per 1000 epidermal cells on either of the leaf surfaces. These results indicate that exogenous MeJA alters the trichome density by affecting leaf area and trichome initiation, and the effects of exogenous MeJA on trichome initiation differ among the various trichome types.

  • exogenous methyl jasmonate alters trichome density on leaf surfaces of rhodes grass chloris gayana kunth
    Journal of Plant Growth Regulation, 2010
    Co-Authors: Hidekazu Kobayashi, Mikiko Yanaka, Tatsuya M. Ikeda
    Abstract:

    Jasmonates, including jasmonic acid and its derivatives such as methyl jasmonate (MeJA), are Plant Growth Substances that control various responses. Jasmonates regulate leaf trichome density in dicotyledonous Plants, but their effects on the trichome density of monocotyledonous Plants, such as those in the Poaceae, remain unclear. In the present study we examined the effects of exogenous MeJA on the trichome density of Rhodes grass, which has three kinds of trichomes: macrohairs, salt glands, and prickles. Exogenous MeJA significantly increased the densities of macrohairs and salt glands on the adaxial and abaxial leaf surfaces and those of prickles on the adaxial leaf surface. Because exogenous MeJA significantly reduced the leaf area, we calculated the number of trichomes per 1000 epidermal cells to eliminate the effects of reduced leaf area. Exogenous MeJA significantly increased the number of macrohairs per 1000 epidermal cells on both adaxial and abaxial leaf surfaces, but it significantly decreased the number of salt glands per 1000 epidermal cells on both surfaces. Exogenous MeJA had no significant effects on the number of prickles per 1000 epidermal cells on either of the leaf surfaces. These results indicate that exogenous MeJA alters the trichome density by affecting leaf area and trichome initiation, and the effects of exogenous MeJA on trichome initiation differ among the various trichome types.

V K Sawhney - One of the best experts on this subject based on the ideXlab platform.

  • role of Plant Growth Substances in ms33 controlled stamen filament Growth in arabidopsis
    Physiologia Plantarum, 1999
    Co-Authors: Houman Fei, V K Sawhney
    Abstract:

    The rapid Growth of stamen filaments just before flower anthesis in Arabidopsis thaliana does not occur in the male sterile33 (ms33, formerly known as msZ) mutant, ms33 filaments were approximately 40% shorter than the wild type (WT), and there was corresponding reduction in the epidermal cell length of filaments. This suggests that MS33 controls the final cell-elongation phase of filament Growth. Both low temperatures and gibberellic acid (GA 3 ) restored filament and cell Growth in intact ms33 flowers, but these treatments only had a small promotive effect on WT filaments. Decapitation experiments involving the removal of the anther had the opposite effect on WT and ms33 filaments; Growth was inhibited in WT, but was increased in ms33 filaments. In young stamen primordia cultured in vitro, filament Growth was less in WT, but more in ms33, than in respective in vivo produced filaments. Plant Growth Substances (PGSs), GA 3 and indole-3-acetic acid (IAA) were promotive, zeatin had no effect, and abscisic acid (ABA) and ethrel inhibited filament Growth in both intact and decapitated WT and ms33 filaments. Together these observations suggest that MS33 is activated immediately before anthesis and that the MS33 product either regulates temporal biosynthesis of gibberellins (GAs) and/or IAA or makes the filament tissue sensitive to these PGSs, which in turn trigger cell elongation and filament Growth. The data also suggest that ms33 mutant anthers contain a relatively high ratio of Growth inhibitors to promoters, which inhibits epidermal cell elongation and filament Growth.

  • male sterility in flowering Plants are Plant Growth Substances involved
    American Journal of Botany, 1994
    Co-Authors: V K Sawhney, Amit Shukla
    Abstract:

    Male sterility in flowering Plants is of tremendous importance not only in molecular and developmental studies of stamen and pollen grains and evolutionary studies on the origin of dioecy, but also in its commercial application in hybrid seed production. This paper reviews the literature on the possible involvement of Plant Growth Substances (PGSs) in male sterility, and in normal stamen and pollen development. Different experimental approaches on a number of male sterile systems and normal Plants have shown that nearly all PGSs, i.e., gibberellins, cytokinins, auxin, abscisic acid, and ethylene, directly or indirectly influence the expression of male sterility. Analyses of endogenous PGSs have revealed that in male sterile Plants the level and/or metabolism of more than one PGS is affected. These studies support the suggestion that it is the relative ratio of various PGSs, rather than any one substance, that is critical for normal stamen and pollen development. It is also proposed that gene-regulated male sterility is likely mediated through an altered balance of endogenous PGSs in developing flowers and stamens.

  • comparative regenerative ability of internodal segments of wild type and a genic male sterile line of rapeseed brassica napus cultured in vitro
    Plant Science, 1991
    Co-Authors: Amit Shukla, V K Sawhney
    Abstract:

    Abstract Internodal segments of a wild type (WT, cv. Westar) and a genic male sterile (GMS) line of rapeseed (Brassica napus) were used to regenerate Plantlets in vitro, and to determine the differences, if any, in response of the two lines to added Plant Growth Substances. The WT exPlants produced shoots in the presence of both benzylamino purine (BAP) and naphthaleneacetic acid (NAA). In the same medium, GMS exPlants also produced shoots, but were fewer in number than WT. In contrast, GMS exPlants produced more roots per exPlant in a medium containing NAA and BAP as compared to the WT. Plantlets regenerated from WT and GMS exPlants ultimately developed into normal and male sterile Plants, respectively. The differential regenerative response by WT and GMS exPlants should be of value to Plant breeders interested in developing clones of male sterile lines, and may reflect a difference in the endogenous auxin/cytokinin ratio of these two lines.

Amit Shukla - One of the best experts on this subject based on the ideXlab platform.

  • male sterility in flowering Plants are Plant Growth Substances involved
    American Journal of Botany, 1994
    Co-Authors: V K Sawhney, Amit Shukla
    Abstract:

    Male sterility in flowering Plants is of tremendous importance not only in molecular and developmental studies of stamen and pollen grains and evolutionary studies on the origin of dioecy, but also in its commercial application in hybrid seed production. This paper reviews the literature on the possible involvement of Plant Growth Substances (PGSs) in male sterility, and in normal stamen and pollen development. Different experimental approaches on a number of male sterile systems and normal Plants have shown that nearly all PGSs, i.e., gibberellins, cytokinins, auxin, abscisic acid, and ethylene, directly or indirectly influence the expression of male sterility. Analyses of endogenous PGSs have revealed that in male sterile Plants the level and/or metabolism of more than one PGS is affected. These studies support the suggestion that it is the relative ratio of various PGSs, rather than any one substance, that is critical for normal stamen and pollen development. It is also proposed that gene-regulated male sterility is likely mediated through an altered balance of endogenous PGSs in developing flowers and stamens.

  • comparative regenerative ability of internodal segments of wild type and a genic male sterile line of rapeseed brassica napus cultured in vitro
    Plant Science, 1991
    Co-Authors: Amit Shukla, V K Sawhney
    Abstract:

    Abstract Internodal segments of a wild type (WT, cv. Westar) and a genic male sterile (GMS) line of rapeseed (Brassica napus) were used to regenerate Plantlets in vitro, and to determine the differences, if any, in response of the two lines to added Plant Growth Substances. The WT exPlants produced shoots in the presence of both benzylamino purine (BAP) and naphthaleneacetic acid (NAA). In the same medium, GMS exPlants also produced shoots, but were fewer in number than WT. In contrast, GMS exPlants produced more roots per exPlant in a medium containing NAA and BAP as compared to the WT. Plantlets regenerated from WT and GMS exPlants ultimately developed into normal and male sterile Plants, respectively. The differential regenerative response by WT and GMS exPlants should be of value to Plant breeders interested in developing clones of male sterile lines, and may reflect a difference in the endogenous auxin/cytokinin ratio of these two lines.