棉花不同类型品种苗期耐盐性差异研究

为比较鉴定转基因抗虫棉品种与普通陆地棉品种的耐盐性差异，指导耐盐抗虫棉品种选育，以双价抗虫棉品种SGK321和普通陆地棉品种‘石远321’(SY321)为材料，利用不同盐分含量砂培和土培试验研究它们苗期的耐盐相对指标和某些耐盐理化指标变化。结果表明，在盐(NaCl)胁迫下，SGK321棉苗叶片的丙二醛和Na+含量均高于SY321，而游离脯氨酸、可溶性糖、类胡萝卜素、K+、叶绿素a、叶绿素b、叶绿素a+b含量、过氧化物酶活性、K+/Na+值、净光合速率及各项耐盐相对指标均低于SY321，耐盐综合指标低10.3%，差异显著。总体上，SGK321苗期的耐盐性明显低于SY321。表明选用耐盐性强的亲本并注重耐盐性选择是培育耐盐抗虫棉品种的有效途径。

Salt Tolerant Variation between Different Type Cotton Cultivars at Seedling Stage

The salt tolerant variation between transgenic and insect-resistant upland cotton cultivar and nor mal upland cotton cultivar was identified to provide the guidance for breeding of salt tolerant and insect-resis tant cotton cultivar. The experiments of sand and soil pot culture with different salinity were conducted with two types of cotton cultivar, Bt+Cpti upland cotton (Gossypium hirsutum L.) cultivar SGK321 and normal up land cotton (Gossypium hirsutum L.) cultivar SY321, to comparatively study their sp...