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木地肤的开花动态与花粉活力及柱头可授性研究/Study on the flowering dynamic,pollen viability and stigma receptivity of Kochia prostrate[J]
Authors
GUO Hong-chao
WEI Yan
+6 more
YAN Cheng
严成
中国科学院新疆生态与地理研究所,新疆 乌鲁木齐,830011
新疆农业大学草业与环境科学学院 新疆草地资源与生态重点实验室,新疆 乌鲁木齐,830052
郭红超
魏岩
Publication date
1 January 2014
Publisher
Abstract
在自然种群中对木地肤的开花物候、开花动态进行观察,用 MTT法测定了木地肤单花花粉的活力及其柱头的可授性。结果表明,木地肤生殖枝穗状花序的开花顺序是:中上部→下部→顶部,叶腋聚头状花序的开放顺序是:中央小花→外轮小花;木地肤单花花期分为雌性亚期和雄性亚期,雌性亚期10~12 d,雄性亚期1 d;木地肤有红黄两种颜色柱头,雄蕊有红黄两种颜色花药,自然种群中花有4种不同的柱头花药组合类型;木地肤的花粉活力在盛花期>80%,4~8 h内花粉活力最高,之后活力明显下降,黄色花药的花粉寿命(8 h)长于红色花药内花粉寿命(4 h);木地肤红色和黄色柱头的可授性变化趋势一致,柱头在刚露出花被片时就具有可授性,并随柱头生长持续加强,在第8~12天时可授性最强,柱头可授期长达12 d,占单花花期的92.3%;P/O(花粉/胚珠)比值为61900~64200,属于异交繁育系统。对开花动态与花粉活力及柱头可授性的研究将为探讨其繁育系统进化及生态适应机制提供科学依据,并为新疆荒漠地区饲用半灌木良种的繁育提供基础资料
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Last time updated on 29/11/2016