Ethylene and ACC levels in developing grains are related to the poor appearance and milling quality of rice |
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Authors: | Hao Zhang Guilu Tan Zhiqin Wang Jianchang Yang Jianhua Zhang |
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Institution: | (1) Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou, Jiangsu, China;(2) Department of Biology, Hong Kong Baptist University, Hong Kong, China |
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Abstract: | The possible relationship between the levels of ethylene and 1-aminocylopropane-1-carboxylic acid (ACC) in the grains and
the quality of rice (Oryza
sativa L.) were investigated by using 12 rice cultivars. The results showed that both the ethylene evolution rate and ACC content
in grains during the grain filling period correlated negatively with head rice production and positively with chalky kernels,
chalky size, and chalkiness. The levels of ethylene and ACC were not significantly correlated with alkali spreading value
and amylose content. Application of ethephon, an ethylene-releasing agent, or ACC to panicles at the early grain filling stage
significantly reduced the rates of brown rice, milled rice, and head rice, and significantly increased the percentage of chalky
kernels, chalky size, and chalkiness. Application of aminoethoxyvinylglycine, an inhibitor of ACC synthase, had the opposite
effect. Chalkiness appears to be a senescence related phenomenon which is stimulated by ethylene. The results suggest that
ethylene and ACC in grains play an important role in regulating rice quality, and that grain appearance and milling quality
would be improved though the reduction of ethylene and ACC in grains during grain filling. |
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Keywords: | 1-Aminocylopropane-1-carboxylic acid (ACC) Appearance quality Ethylene Grain filling Milling quality Rice (Oryza sativa) |
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