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Abstract Detail

Recent Topics Posters

Yao, Chi [1], Finlayson, Scott [2].

Abscisic Acid Regulation of Branching .

Axillary meristem production and activity contribute to the high plasticity of plant development which allows plants to respond to environmental changes. Branches arise from axillary buds that form in the leaf axil. These buds may remain dormant, or may grow out to form branches immediately. Alternatively, the axillary buds may also persist in a dormant state for an indefinite period of time until appropriate signals permit outgrowth to commence. Branching is regulated by phytohormones, including auxin acting via the polar auxin transport stream, and locally within the bud by the action of branching integrators like BRC1. Branching, is also regulated by environmental factors such as competition signals (low Red light: Far-Red light [R: FR]) that inhibit bud outgrowth. Our recent studies indicate that ABA acts within the bud to suppress outgrowth. NCED3 is a key enzyme in ABA biosynthesis pathway. ABA accumulated to significantly higher levels in lower, more dormant buds compared to less dormant buds at higher rosette positions. Additionally, bud ABA content and the correlative inhibition index, which is a measure of systemic branching suppression, were increased in plants grown under low R:FR compared to those grown under high R:FR. Under low R:FR the NCED3 deficient mutant nced3-2 had significantly more branches and a lower correlative inhibition index than WT. The results indicate that the suppression of branching by low R:FR may be mediated, at least in part, by elevated levels of ABA in the buds.

Broader Impacts:

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1 - Texas A&M University, Soil and Crop Science, Heep Center 235, College Station, TX, 77840, USA
2 - Texas A&M University, Soil and Crop Science, Heep Center 220B, College Station, TX, 77840, USA

Abscisic acid
Axillary bud
Correlative inhibition.

Presentation Type: Recent Topics Poster
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PRT004
Abstract ID:1290
Candidate for Awards:None

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