Heterotrimeric G Proteins and Plant Hormone Signaling in Rice

Oki, Katsuyuki; Fujisawa, Yukiko; Kato, Hisayoshi; Iwasaki, Yukimoto

doi:10.1007/978-3-642-03524-1_7

Integrated G Proteins Signaling in Plants

2009

DOI: 10.1007/978-3-642-03524-1_7

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Heterotrimeric G Proteins and Plant Hormone Signaling in Rice

Katsuyuki Oki

Yukiko Fujisawa

Hisayoshi Kato

et al.

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2012

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Cited by 2 publications

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“…In rice, there are three genes for the canonical a subunit (Ga), β subunit (Gβ) and c subunit (Gc) for the heterotrimeric G proteins, namely RGA1, RGB1 and RGG1, respectively. 1 The deficient mutant for RGA1, d1, has a dwarf phenotype and sets few seed. 2 Recently, the cause of dwarfism in d1 was found to be due to a reduced cell number.…”

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confidence: 99%

Rice transgenic plants with suppressed expression of the β subunit of the heterotrimeric G protein

Utsunomiya¹,

Samejima²,

Fujisawa³

et al. 2012

Plant Signaling & Behavior

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The deficient mutant for the rice heterotrimeric G protein α subunit gene (RGA1), d1, showed dwarfism and set small seed due to a reduced cell number. Mutants for the rice heterotrimeric G protein β subunit gene (RGB1) have not been isolated. To determine the functions of RGB1, transgenic rice plants with suppressed expression of RGB1 were studied using the RNAi method. RGB1 knock-down lines showed browning of the lamina joint regions and nodes and reduced fertility, but these abnormality were not observed in d1. Transgenic plants in which the G protein β subunit was greatly decreased were not obtained, suggesting that the complete suppression of RGB1 mRNA may be lethal. In contrast, the d1 mutants, with complete loss of the G protein α subunit, were fertile and half the size of the WT. These studies suggest that RGB1 has different functions than RGA1.

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mentioning

confidence: 99%

Rice transgenic plants with suppressed expression of the β subunit of the heterotrimeric G protein

Utsunomiya¹,

Samejima²,

Fujisawa³

et al. 2012

Plant Signaling & Behavior

Self Cite

View full text Add to dashboard Cite

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Modified plant architecture to enhance crop disease control: genetic control and possible value of upright fruit position in cucumber

et al. 2012

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Plant architectural features can facilitate disease control by creating unfavourable environments for pathogen growth or limiting pathogen contact with the host. In the case of Phytophthora capsici infection of cucumber (Cucumis sativus), the susceptible fruit typically lie in contact with soil under warm, moist conditions of a full canopy, an ideal location for exposure to inoculum and disease development. We have shown that increased row spacing, trellising and architectural variants that allow for more open canopies, such as shorter vines, reduced branching, or smaller leaves, can modify microclimate as assessed by temperature at the location of developing fruits. However, only trellising reduced infection rates (<3 % infection vs. 22 % for control). A cucumber accession PI308916, with extremely short internodes and resulting upright position of young fruit, also exhibited reduced disease. Fruit of PI308916 were susceptible when inoculated with P. capsici, indicating that reduced infection likely resulted from decreased soil contact. The compact trait is inherited as a single recessive gene, cp. Like many architectural traits, cp may be pleiotropic; PI308916-derived breeding lines were reported to have poor seedling emergence. PI308916 exhibited inconsistent apical hook formation that cosegregated with short internodes in F 2 and backcross generations, and disorganized internodal cortical cell arrangement. The combined phenotypes suggest either pleiotropy or very tight linkage of genes affecting hormone balance or cell division. The narrow chromosome region recently defined by QTL analysis includes candidate gene homologs of meristem related genes modulating cell division or spacing of lateral shoot organs and genes associated with brassinosteroid signaling or cytokinin content.

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Heterotrimeric G Proteins and Plant Hormone Signaling in Rice

Cited by 2 publications

References 53 publications

Rice transgenic plants with suppressed expression of the β subunit of the heterotrimeric G protein

Rice transgenic plants with suppressed expression of the β subunit of the heterotrimeric G protein

Modified plant architecture to enhance crop disease control: genetic control and possible value of upright fruit position in cucumber

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