渍涝与干旱对不同转Bt基因抗虫棉的影响

Influences of Waterlogging and Drought on Different Transgenic Bt Cotton Cultivars

对 3个转 Bt基因棉花品种的研究表明 ,花铃期田间渍涝显著降低皮棉产量和棉株内的 Bt蛋白含量。积水后棉花主茎功能叶和幼蕾的 Bt蛋白含量平均分别比对照降低 2 7.7%和 2 9.9% ,主茎下部老叶的 Bt蛋白含量仅降低 6 .6 % ,说明渍涝对生长旺盛器官 Bt蛋白合成的影响远远大于衰老器官。干旱对棉株内 Bt蛋白合成的抑制更强 ,当花铃期干旱使棉叶致萎时 ,主茎下部老叶、幼蕾和主茎功能叶的 Bt蛋白含量分别降低了52 .9%、3 7.0 %和 3 0 .0 %。为充分发挥和利用转Bt基因棉花品种的产量与抗虫潜力 ,棉花生长发育的关键时期应尽量避免缺水干旱 ,及时排除田间积水 。

Investigation on 3 transgenic Bt cotton cultivars showed that both lint yield and Bt protein content within plants were significantly decreased by the waterlogging in flowering and boll fruiting stage. After waterlogging,Bt protein content in the active function main stem leaves and the squares reduced 27.7% and 29.9% , respectively,the content in the old leaves of the second joint from main stem bottom only reduced 6.6%,indicating much stronger influence on the highly active growing organs.Aridness showed even stronger inhibition to Bt protein composation within the cotton plants.When leaves became wilt due to aridness in flowering and boll fruiting stage,Bt protein content in the old leaves,the active function leaves and the squares reduced 52.9%,37.0% and 30.0%,respectively.To get a high yield and to make the full use of the advantage of transgenic Bt cultivars in pest resistance ,it is very important to escape aridness and to drain waterlogging in time during the key growing and development stages of cotton plants.