内蒙古荒漠草原植物遗传多样性对模拟增温处理的响应

发布时间：2018-04-29 16:06

  本文选题：木地肤 + 短花针茅　； 参考：《生态学报》2016年21期

【摘要】：为探究全球变暖对温带荒漠草原地上种群的遗传影响,对已经接受模拟增温处理6年的短花针茅草原4种不同生活型植物,即半灌木、多年生禾草、多年生杂类草和一年生植物,应用AFLP分子标记方法研究了其遗传多样性和遗传结构。结果显示,对照处理与增温处理下的木地肤、短花针茅、细叶葱、猪毛菜4种植物的多态位点百分率(PPB)分别为11.32%,11.32%;40.83%,39.91%;14.29%,13.10%;19.85%,19.12%。Nei's基因多样性指数(He)分别为0.0274,0.0259;0.0812,0.0899;0.0131,0.0084;0.0506,0.0456。Shannon's信息指数值(I)分别为0.0447,0.0430;0.1354,0.1466;0.0267,0.0182;0.0811,0.0733。分子方差分析(AMOVA)显示4种植物的变异主要来源于实验处理内部,木地肤为85.03%,短花针茅为66.35%,细叶葱为70.00%,猪毛菜为66.52%;增温处理间的变异分别占-2.81%,-5.47%,-3.60%,2.53%(P0.05)。4种植物增温处理与变异程度之间在统计学上并无相关性。研究表明虽然短时间的模拟增温并不足以使4种生活型植物种群遗传多样性和遗传结构发生显著变化,但相对于3种多年生植物,一年生植物猪毛菜更容易受到增温影响。多年生和一年生植物对增温具有不同的遗传响应。
[Abstract]:In order to investigate the genetic effects of global warming on the aboveground population of temperate desert steppe, four species of different life forms, namely, subshrubs, perennial grasses, have been treated with simulated warming for 6 years. The genetic diversity and genetic structure of perennial hybrids and annual plants were studied by AFLP molecular marker method. 缁撴灉鏄剧ず,瀵圭収澶勭悊涓庡�炴俯澶勭悊涓嬬殑鏈ㄥ湴鑲�,鐭�鑺遍拡鑼�,缁嗗彾钁，

本文编号：1820634