What question did this study set out to answer?

To determine the functional role of the rice heterotrimeric G protein alpha subunit in brassinosteroid signaling and clarify its epistatic relationship with the BRI1 brassinosteroid receptor.

November 26, 2008Plant and Cell Physiology

Function of the Subunit of Rice Heterotrimeric G Protein in Brassinosteroid Signaling

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Authors

KOKenji OkiHiroshima University NINaofumi INABACentral Japan Railway (Japan)KKKatsumi KitagawaThe University of Texas Health Science Center at San Antonio

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Implication

Genetic analysis reveals reduced brassinosteroid sensitivity in rice Galpha mutants, suggesting heterotrimeric G proteins modulate signaling pathways outside direct BRI1 receptor transduction.

Key Points

To determine the functional role of the rice heterotrimeric G protein alpha subunit in brassinosteroid signaling and clarify its epistatic relationship with the BRI1 brassinosteroid receptor.
Evaluated responses to 24-epi-brassinolide (24-epiBL), including root growth inhibition, coleoptile elongation, and internode elongation patterns, in the rice Galpha loss-of-function mutant T65d1.
Quantified brassinosteroid intermediate levels and monitored the feedback regulation of brassinosteroid biosynthetic gene expression following 24-epiBL application.
Generated and phenotyped a T65d1/d61-7 double mutant by crossing the Galpha mutant with a weak brassinosteroid receptor mutant allele to test for genetic epistasis.
T65d1 mutants demonstrated reduced sensitivity to 24-epiBL during root inhibition and coleoptile elongation, alongside morphological traits characteristic of brassinosteroid deficiency such as shortened second internodes.
Negative feedback suppression of brassinosteroid biosynthetic genes by 24-epiBL remained active in T65d1, and endogenous brassinosteroid intermediate levels showed no significant fluctuation.
T65d1/d61-7 double mutants exhibited additive, non-epistatic defects in internode elongation, internode patterning, and leaf morphology, showing epistasis only for vertical seed length and seed weight.

Cite This Study

Oki et al. (2008) studied this question.

synapsesocial.com/papers/6a9966bfe739824d2c78da68 https://doi.org/10.1093/pcp/pcn182

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Implication

Genetic analysis reveals reduced brassinosteroid sensitivity in rice Galpha mutants, suggesting heterotrimeric G proteins modulate signaling pathways outside direct BRI1 receptor transduction.

Function of the Subunit of Rice Heterotrimeric G Protein in Brassinosteroid Signaling

Discussion

Member takes

Implication

Key Points

Cite This Study

Function of the Subunit of Rice Heterotrimeric G Protein in Brassinosteroid Signaling

Discussion

Member takes

Implication

Key Points

Cite This Study

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