Abscisic acid positively regulates rice spikelet closure.
Huang Y, Xiao Q, Zeng H, Zeng X
Plant Signaling
Rice farmers and breeders lose significant yield when flower timing goes wrong during hybrid seed production, and this finding points to a simple hormone spray that could fix it.
Rice flowers open briefly to allow pollination, then close again to protect the developing seed. Scientists discovered that a natural plant hormone called abscisic acid acts like a signal telling the flower to close — the more of it present, the faster and more completely the flower shuts. When they combined this hormone with another plant signal (methyl jasmonate) and sprayed it on rice plants used in hybrid seed production, the flowers closed better and the overall seed harvest went up.
Key Findings
ABA applied at 200–400 mg/L significantly accelerated spikelet closure and increased final closure rates in both fertile and sterile rice lines.
Blocking ABA with the inhibitor fluridone delayed closure and reduced final closure rates, confirming ABA's causal role.
Combined MeJA + ABA treatment improved glume closure rates and hybrid rice seed yield, offering a practical breeding application.
chevron_right Technical Summary
A plant hormone called abscisic acid (ABA) controls how quickly rice flowers close after pollination. Applying ABA to rice plants speeds up closure and boosts seed yield in hybrid rice breeding — a discovery with direct practical applications for improving rice crop production.
Abstract Preview
To investigate the mechanisms underlying rice glume closure and develop effective regulatory strategies, we examined both fertile (Xingan Zaozhan, Jiazao 70, and Zhenshan 97B) and sterile (Qiyuan S...
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