Physiological Response of Cotton in Flowering Stage to Waterlogging Coupling with High Temperature

Wei Yang ； Qi-xia Wu ； Jian-qiang Zhu

《Advance Journal of Food Science and Technology》 4卷6期 (2012/12) Pp. 404-408

並列摘要

In midsummer, southern plain of China often has plenty of precipitation meanwhile encounters hot damage and a phenomena may occur that a synoptic process with the maximum temperature more than 35 for more than 3 days befalls within a week or 10 days after farmland suffering from waterlogging caused by heavy rainfall, this phenomena can be defined as concomitance of hot and waterlogging (abbreviated as CHW). The stage of cotton flowering stage in southern plain of China is just in midsummer, so cotton often meets comprehensive stress from CHW stress, CHW stress during this stage inhibits cotton development and reduces final yield significantly. In order to study the stress reaction and subsequent response under the artificial simulated high temperature and waterlogging after rained coupling effects, used E Hybrid Cotton 88 which widely cultivated in the Middle-Lower of Yangtze River in China, analyzed the effects of waterlogging on SOD and POD activities and MDA contents and chlorophyll contents of cotton under high temperature stress during flowering stage. The results showed that high temperature and waterlogging effects apparently decreased SOD activities, chlorophyll of a, b and a/b, declined significantly comparison of CK. During the beginning stage in upon double stresses, they had slow changes and no significant differences among those treatments. However, the 5 days of the end of the high temperature days in later period, its value gradually increased and the decomposition rate of chlorophyll a was faster than chlorophyll b, ranges from 0.70 to 1.68 and from 0.10 to 0.50, respectively; Oppositely, waterlogging and high temperature double stresses significantly increased the POD activity and MDA contents, which declined significantly compared with CK. Generally, as the intensity of high temperature and waterlogging double stresses increased (decreased), the upper indexes added (reduced) obviously, of that surface watelogging 6 days＞ subsurface waterlogging 10 days＞ surface warerlogging 3 days＞ subsurface waterlogging 5 days, high temperature duration time 7＞5＞3 days, daily high temperature duration time 6＞3 h. The test is not a good proxy for growing cotton under high temperature and waterlogging stresses, but promoted the theoretical innovation and development of farmland drainage, improving agricultural production level.

並列關鍵字

Cotton ； growth indexes ； high temperature ； waterlogging stress