• 研究报告 •

### 旱涝胁迫对棉花根系生长的影响

1. （武汉大学水资源与水电工程科学国家重点实验室， 湖北武汉 430072）
• 出版日期:2018-07-10 发布日期:2018-07-10

### Effects of drought and waterlogging stress on root growth of cotton.

HUANG Tao-xing, WANG Xiu-gui*, WU Hao, ZHANG Jin-xing

1. (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China).
• Online:2018-07-10 Published:2018-07-10

Abstract: To clarify the effects of drought and waterlogging stress on root of cotton at flowering and boll-setting stages, an experiment with drought, waterlogging and abrupt droughtflood treatments was carried out in the Irrigation and Drainage Experiment Station of Wuhan University in 2016. Minirhizotron systems were used to conduct in situ and long-time monitoring of root systems and digging method was used to validate the obtained data. The images obtained by minirhizotron were equivalent to a 3.3 mm depth of field (DOF) around the tube. From the squaring stage to boll opening stage, root growth resembled an S-shaped curve, with the fastest growth in the flowering stage. The cotton roots were mainly distributed in 0-30 cm soil layer, accounting for 70%-80% of the total amount of the roots. The total root length and total root surface area under different treatments were in the order of waterlogging > waterlogging after drought > control > drought. Waterlogging led to rapid growth of roots at the upper soil layer, especially for those with diameter of 0.2-0.4 mm. Drought decreased root length density, increased root diameter and the proportion of roots in deeper layers, which caused the barycenter of the roots to move downwards. The root growth rate was larger in the drought treatment followed by waterlogging treatment compared to the control group, implying that waterlogging has a compensatory effect on root growth following previous drought stress.