盐分胁迫对转基因抗虫棉及亲本生长发育的影响

盆栽试验研究了不同盐分水平下转基因抗虫棉及其亲本的耐盐性。结果表明,随盐分的提高,转基因抗虫棉及其亲本表现出类似规律,叶片水势及叶绿素含量降低,光合作用在一定范围内有所升高而后下降,植株高度与干物质积累有不同程度下降等。相同盐分水平下"石远321"双价抗虫棉(简称"双抗321")及亲本普通"石远321"(简称"普321")、"国抗1号"和亲本"泗棉3号"的表现为转基因抗虫棉比其亲本有较低的叶片水势,较高的叶片叶绿素含量、植株高度、干物质积累及光合速率等,而对于"中棉30"(抗虫棉)及其亲本"中棉16"则表现相反。

Effect of salt stress on growth and development of Bt transgenic cotton mutants and their parent cultivars

The growth and development of Bt transgenic cottons and their parent cultivars in different levels of salinity were studied in sand-culture.Results show that with increase in salt stress,leaf water potential,chlorophyll content,plant height,and dry matter accumulation of both Bt transgenic cottons and their parent cultivars decrease.Photosynthesis initially increases,but then decreases with increase in salt stress.Under constant salinity stress Bt transgenic cotton,"Bt 321" and "Guokang 1",responds stronger to salt stress than their parent cultivars,"Shiyuan 321" and "Simian 3",as evident in leaf water potential,chlorophyll content,plant height,dry matter accumulation,and the like.However,in comparison with "CCRI30" and "CCRI16",Bt transgenic cotton shows low tolerance to salinity.