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以糯米糍荔枝生理落果期的田间调查和胚胎发育研究为基础,探讨了内源激素与生理落果的关系.结果表明,糯米糍生理落果高峰的主要原因是:第1次因授粉受精不良导致的生长促进类激素尤其是CTK水平过低;第2次与胚乳为胚的发育所利用而消失、IAA和GAs急剧降低有关;第3次与胚的败育造成CTK、GAs和IAA的全面下降有关;第4次发生在假种皮(果肉)迅速生长期,与种皮和假种皮ABA升至高水平有关.此外,还探讨了ABA /(IAA+GAs+CTK)与生理落果的相关性,以及胚囊、珠被和假种皮等果实内部组分内源激素的变化特点.
The relationship between endogenous hormones and physiological declension was discussed based on the field investigation and embryo development of the litchi fruit during the fruit fall and litchi period.The results showed that the main reason of the physiological declension of glutinous rice stem was the first result of poor pollination and fertilization Growth promoting hormones, especially CTK levels were too low; 2nd and endosperm for the development of the embryo disappeared, IAA and GAs decreased sharply; the third and embryo abortion caused CTK, GAs and IAA decreased ; The fourth occurred in the rapid growth of the aril (pulp), which was related to the increase of the ABA of the seed coat and the aril. In addition, the correlation between ABA / (IAA + GAs + CTK) As well as the changes of endogenous hormones in the inner components of embryo sac, integument and aril.