Effects of ethephon,GA3 and nutrient elements on sex expression of Chinese chestnut |
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Authors: | Yang Qiguang Ren Lizhong Du Guohua |
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Affiliation: | Anhui Agricultural College, Hefei, Anhui Province People''s Republic of China |
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Abstract: | The effects of ethephon or GA3 on sex expression of Chinese chestnut (Castanea mollissima BL.) were opposite to the effects of these plant growth regulators on cucumber, pumpkin and Chinese white-flowered gourd. Ethephon at 100–500 mg 1?1 inhibited the development of female flowers and promoted that of male flowers. GA3 at 50–500 mg 1?1 caused a significantly lower number of male inflorescences, but increased the number of female flowers. Urea applications decreased the number of male inflorescences and increased the number of female flowers. For plants grown on phosphorous-deficient soils, fertilizing with superphosphate also increased the number of female flowers. Spraying trees with GA3, urea or a mixture of both increased the number of female flowers. Therefore, it is proposed that such applications should be employed at the onset of differentiation of flower primordia of Chinese chestnut to increase the ratio of female to male flowers. |
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Keywords: | ethephon nutrition sex expression GA3 gibberellic acid PGR plant growth regulator |
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