外源植物激素对羊草开花习性及结实特征的影响

doi:10.11924/j.issn.1000-6850.casb18090061

摘要/Abstract

摘要： 为了提高羊草有性结实能力和提高羊草种子产量及质量，在羊草人工草地于羊草拔节期（5月19日）叶面喷施一定浓度的赤霉素(GA3)、生长素(IAA)和细胞分裂素(KT),研究植物激素对羊草开花习性和结实特征的影响。结果表明不同外源植物激素,对羊草开花习性及结实特征影响不同。低浓度(75 mg.L-1)GA3通过增加盛花期后期开花数以及上午9:00前的小花开放数量,来增加开花总数和结实数,并最终显著增加了单穗种子重(P<0.05)。在盛花期内,150 mg.L-1的KT没有显著影响羊草单穗开花数,但最终显著增加了羊草单穗结实数和种子重(P<0.05)。75 mg.L-1浓度的IAA对羊草开花数、结实数和种子重均没有显著影响。因此，在羊草拔节期，叶面喷施一定浓度的GA3和KT对羊草开花习性和结实特征有显著促进作用。

关键词: 土壤调理剂, 土壤调理剂, 烤烟, 产量, 品质, 肥料利用率

Abstract: To improve the sexual reproduction of Leymus chinensis, and yield and quality of its seeds, the gibberellin, auxin and cytokinin were selected for foliar spray on L. chinensis leaves at jointing stage in the artificial pasture, to study their effects on blooming and fruiting characteristics. The results showed that the effects of different plant hormones on blooming and fruiting characteristics of L. chinensis were different, low concentration GA3 (75 mg/L) increased the total number of flowers and fruiting through increasing blooming number in later period of full- bloom stage and the floret number bloomed before 9:00 am, and at last it increased the weight of single spike (P<0.05). Although 150 mg/L KT did not influenced the floret blooming number during full-blooming, it increased the seed number and weight per plant significantly (P<0.05). 75 mg/L IAA had no effects on the floret blooming number, the seeds number and weight per plant. Therefore, spraying GA3 and KT with moderate concentration on leaves at jointing stage is beneficial for blooming and fruiting characteristics of L. chinensis.

中图分类号:

韩忠海,李晓宇,张继涛,穆春生. 外源植物激素对羊草开花习性及结实特征的影响[J]. 中国农学通报, 2019, 35(35): 124-128.

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