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草业学报  2015 

干旱及复水对山西野生草地早熟禾幼苗生长与生理特性的影响

DOI: 10.11686/cyxb2015098, PP. 79-88

Keywords: 野生草地早熟禾,干旱,复水,生理特性

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Abstract:

以15份山西野生草地早熟禾种质为材料,待其长至4~5片真叶时,采用盆栽控水法进行21d干旱及7d复水处理,取样测定植株存活率、相对生长率(RGR)、叶片相对含水量(RWC)、游离脯氨酸(Pro)、超氧化物歧化酶(SOD)和丙二醛(MDA)含量,并根据隶属函数法对其抗旱性进行综合评价。结果表明,在干旱胁迫下,不同居群野生草地早熟禾幼苗的存活率、RGR、RWC和SOD活性下降,Pro、MDA含量则上升。复水后,各指标均有所恢复,但未能恢复至胁迫前水平。抗旱性综合分析将参试草地早熟禾分为3个类群,其中沁水Ⅱ、浑源Ⅰ、沁水Ⅰ、五台、浑源Ⅱ、应县、广灵和灵丘8个居群为Ⅱ级中等抗旱,垣曲、宁武、霍州、忻州、五寨和灵石6个居群为Ⅲ级弱抗旱,屯留居群为Ⅳ级不抗旱居群。沁水Ⅱ居群的隶属值最大,可作为重点对象进行选育研究。

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