在新疆自然生态条件下,通过人工田间调查取样,设置5个严重度水平(60—65),对样叶进行光合能力测试。随着严重度增加,叶片的净光合速率(A)、蒸腾速率(E)、气孔导度(GH2O)逐渐减小,叶片温度(LT,℃)逐渐增加,胞间CO2浓度(Ci)呈现先减小后增加的变化趋势;病害棉花叶片严重度与光合参数E、GH2O、A均呈极显著负相关(r〉-0.8),与Ci和LT呈极显著正相关(r〉0.5);病害棉叶光合参数E、GH2O、A所有处理(b1-b4)均与b0达极显著差异(P〈0.01),Ci和LT的病害处理b1和b2间未达显著性差异(P〉0.05),但与b3和b4间均达显著性差异。说明病害对叶片A的影响最大,其次是GH2O、E,再次是Ci,LT的影响最小。可见,黄萎病能够破坏棉花叶片生长能力,降低叶片光合能力。
This research aimed to explore the changes of photosynthetic characteristics of cotton leafs with different stages of verticillum wilt disease. The research firstly introduced its sampling and research method, according to the paper, the sample was randomly collected from cotton fields, while it distinguished 5 stages of disease severity and tested its samples. As the results indi- cated, with the increase of the severity, the net photosynthesis rate (A), the transpiration rate (E) and the stomata conductance (GH20) were gradually decreased, the leaf temperature (LT) was successively increased, while the internal CO2 (Ci) experienced an increase before it dropped. In addition, the severity showed a highly significant negative correlation with A, E and GH2O (r 〉 - 0.8) ; while it had a highly significant positive correlation with Ci and LT. On the other hand, each of the processes (b1 -b4) of E, A and GH2O had demonstrated a highly significant difference with b0. As for Ci and LT, the disease treatment b1 and b2 showed insignificant difference (p 〉 0.05 ), yet b3 and b4 expressed a significant difference. The result indicated that the disease affected A the most, GH2O and E gradually, and casted the least influence on Ci and LT. Therefore, this research argued that Verticillum Wilt has a serious impact on cotton leaf's growing ability, and it reduced the leaf's photosynthesis capacity.