Opening of Rice Floret in Rapid Response to Methyl Jasmonate |
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| Authors: | X-C Zeng X Zhou W Zhang N Murofushi T Kitahara Y Kamuro |
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| Institution: | (1) Agronomy Department, Nanjing Agricultural University, Nanjing 210095, China, CN;(2) Agronomy Department, Jiangxi Agricultural University, Nanchang 330045, China, CN;(3) Wuxian Agricultural Institute, Suzhou 215128, China, CN;(4) Department of Applied Biological Chemistry, Akita Prefectural University, Japan, JP;(5) Department of Applied Biological Chemistry, The University of Tokyo, Japan, JP;(6) BAL Planning Co. Ltd., Japan, JP |
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| Abstract: | Effects of methyl jasmonate (MeJA) on rice floret opening were investigated in seven cultivars or hybrid combinations covering
various variety types. Intact or excised panicles, judged to have florets just before anthesis, were soaked in 4 × 10−5− 4 × 10−3M MeJA solutions for 2 min at different temperatures. The results indicated that MeJA significantly induced opening of rice
florets within about 30 min, with the most rapid induction occurring just 6 min after treatment. Numbers of induced opening
florets are correlated with MeJA concentrations. Higher concentrations of MeJA induced more florets. pH values had no influence
on MeJA effect, but MeJA required less time and induced more florets at 34°C than at 25°C. As far as we know, this is the
first evidence that floret opening is induced by plant hormones. CO2 evolution from panicles was also increased by MeJA treatment. Field experiments revealed that perfect flowering synchrony
between the cytoplasmic male sterile (CMS) and restorer lines in hybrid seed production could be obtained by spraying MeJA
solution on CMS line plants at the rate of 25 mg/m2. As a result, many more hybrid seeds were harvested.
Received July 19, 1999; accepted September 30, 1999 |
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| Keywords: | ,Oryza sativa L—,MeJA—,Floret opening—,Lodicule—,Rice flowering—,Hybrid seed production |
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