Gibberellin regulates pollen viability and pollen tube growth in rice.

Gibberellin regulates pollen viability and pollen tube growth in rice. Research Abstract Details 

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Gibberellin regulates pollen viability and pollen tube growth in rice. Abstract Text:

Tory Chhun,Koichiro Aya,Kenji Asano,Eiji Yamamoto,Yoichi Morinaka,Masao Watanabe,Hidemi Kitano,Motoyuki Ashikari,Makoto Matsuoka,Miyako Ueguchi-Tanaka,

Gibberellins (GAs) play many biological roles in higher plants. We collected and performed genetic analysis on rice (Oryza sativa) GA-related mutants, including GA-deficient and GA-insensitive mutants. Genetic analysis of the mutants revealed that rice GA-deficient mutations are not transmitted as Mendelian traits to the next generation following self-pollination of F1 heterozygous plants, although GA-insensitive mutations are transmitted normally. To understand these differences in transmission, we examined the effect of GA on microsporogenesis and pollen tube elongation in rice using new GA-deficient and GA-insensitive mutants that produce semifertile flowers. Phenotypic analysis revealed that the GA-deficient mutant reduced pollen elongation1 is defective in pollen tube elongation, resulting in a low fertilization frequency, whereas the GA-insensitive semidominant mutant Slr1-d3 is mainly defective in viable pollen production. Quantitative RT-PCR revealed that GA biosynthesis genes tested whose mutations are transmitted to the next generation at a lower frequency are preferentially expressed after meiosis during pollen development, but expression is absent or very low before the meiosis stage, whereas GA signal-related genes are actively expressed before meiosis. Based on these observations, we predict that the transmission of GA-signaling genes occurs in a sporophytic manner, since the protein products and/or mRNA transcripts of these genes may be introduced into pollen-carrying mutant alleles, whereas GA synthesis genes are transmitted in a gametophytic manner, since these genes are preferentially expressed after meiosis.

Gibberellin regulates pollen viability and pollen tube growth in rice. Publishing Authors By Initials

T Chhun,K Aya,K Asano,E Yamamoto,Y Morinaka,M Watanabe,H Kitano,M Ashikari,M Matsuoka,M Ueguchi-Tanaka,

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Gibberellin regulates pollen viability and pollen tube growth in rice. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Plant cell

VOLUME: 19

Page Numbers: 3876-88

Journal Abbreviation: Plant Cell

ISSN: 1040-4651

DAY: 14

MONTH: 12

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 9208688

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AFFILIATION: Bioscience and Biotechnology Center, Nagoya University, Chikusa, Nagoya 464-8601, Japan.

Country: United States

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MEDLINETA: Plant Cell

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