PEG胁迫及复水对春小麦苗期生理特性的影响  

Effects of PEG Stress and Recovery on p Hysiological Characteristics of Spring Wheat Seedlings

作　　者：叶景秀[1] 谢德庆[1] 姚有华[1] 

机构地区：[1]青海省农林科学院,青海西宁810016

出　　处：《青海农林科技》2015年第3期6-9,共4页Science and Technology of Qinghai Agriculture and Forestry

基　　金：青海省(应用)基础研究计划项目(2013-Z-721);青海大学中青年科研基金项目(2013-QNT-2)

摘　　要：水分是作物生长发育的必要条件之一,也是限制作物生产力的一个关键生态因素。不同基因型小麦在不同生育阶段对干旱的适应和抵抗能力都是有差异的。为了研究春小麦苗期干旱胁迫及复水条件下的生理特性,本研究选用青海省旱地主栽品种阿勃和水地主栽品种青春38,在人工气候箱里进行不同浓度的PEG6000胁迫及复水试验,研究不同干旱胁迫程度及时间下两品种的丙二醛含量、脯氨酸含量及叶片相对含水量的变化规律。结果表明:-0.5 MPa PEG6000浓度对两品种春小麦丙二醛、脯氨酸及叶片相对含水量影响不大;在-1.0 MPa和-1.5 MPa PEG6000浓度下,两品种的丙二醛、脯氨酸含量都随着干旱胁迫时间的逐渐延长和胁迫强度的逐渐增加而增加,而在恢复正常供水以后,各项值又出现了降低,叶片相对含水量随着干旱胁迫时间的逐渐延长和胁迫强度的逐渐增加而降低,复水后回升。Water is one of the necessary conditions for crop growth and a key ecological factors for limit- ing crop productivity. Different wheat genotypes were different adaptability and resistance on drought at differ- ent growth stage. In order to study the pHysiological characteristics of PEG stress and recovery of spring wheat seedlings, Abbondanza that drought varieties and Qingchun 38 that water varieties were selected and planted in plant growth chamber under different concentration of PEG6000 and recovery to research malonaldehyde （MDA）, proline and relative water content. The results indicated that the MDA, proline and relative water content were little changed under -0.5 MPa PEG6000; The MDA and proline were increased little by little under - 1.0 MPa and - 1.5 MPa PEG6000 with the stress degree stronger and the stress time longer in two cultivars, however, they began to fa/1 again after recovery, the relative water content was decreased with the stress degree stronger and the stress time longer and began to pick up after recovery.

关 键 词：PEG6000胁迫 水地和旱地春小麦 丙二醛含量 脯氨酸含量 叶片相对含水量 

分 类 号：S512.1[农业科学—作物学]