Response of Photosynthetic Characteristic Parameters of Cotton at Flower and Boll Stages to Drought Stress Under Mulched Drip Irrigation

doi:10.11924/j.issn.1000-6850.casb2023-0108

Abstract

Abstract:

In order to clarify the response degree and key threshold of cotton photosynthetic characteristic parameters to drought under mulched drip irrigation, four kinds of continuous drought stress simulation tests with different water gradients were carried out for cotton at flowering and boll stage, and the response and influence threshold of cotton leaf photosynthetic characteristic parameters during the occurrence and development of cotton drought were analyzed. The results revealed that after 10 days of drought stress, cotton fields under different water gradients entered different degrees of drought development. At the start of drought stress, the net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of cotton leaves decreased significantly. As drought stress progressed, the differences in the values of each parameter stabilized, which indicated that cotton could improve its drought resistance adaptability by adjusting photosynthetic rate in the face of persistent drought. The critical soil relative moisture was 46%-52% and the corresponding leaf moisture content was 70.8%-71.3% when the photosynthetic characteristic parameters of cotton were significantly reduced due to drought. With the occurrence and development of drought, the soil moisture was 41%±1% and the corresponding leaf water content was 66.1%±0.3% when the leaf photosynthesis changed from stomatal restriction to non-stomatal restriction. The results of this study can provide reference for identification of drought occurrence degree of oasis cotton field under mulched drip irrigation and the selection of different time nodes to take different degrees of rehydration measures.

Key words: drought stress, response threshold, leaf photosynthetic parameters, mulched drip irrigation, cotton, flower and boll stages

CHEN Xue, JI Chunrong, BAKE Batur, HU Qirui, YANG Mingfeng, GUO Yanyun, LIU Ailin. Response of Photosynthetic Characteristic Parameters of Cotton at Flower and Boll Stages to Drought Stress Under Mulched Drip Irrigation[J]. Chinese Agricultural Science Bulletin, 2023, 39(19): 1-8.

Figures/Tables 7

References 34

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观测日期	梯度灌水后天数/d	发育期
7月14日	10	开花盛期
8月24日	49	裂铃期
9月9日	64	吐絮期
9月16日	74	吐絮盛期
10月8日	96	停止生长

观测日期	梯度灌水后天数/d	发育期
7月14日	10	开花盛期
8月24日	49	裂铃期
9月9日	64	吐絮期
9月16日	74	吐絮盛期
10月8日	96	停止生长

叶片光合特征参数	临界值	叶片含水率阈值/%		土壤相对湿度阈值/%
叶片光合特征参数	临界值	估计值	95%置信区间	估计值	95%置信区间
净光合速率	22.3	71.2	[70.8，71.6]	52	[49，56]
蒸腾速率	7.43	70.8	[70.5，71.2]	49	[46，53]
气孔导度	0.38	70.5	[69.4，71.6]	46	[40，49]

叶片光合特征参数	临界值	叶片含水率阈值/%		土壤相对湿度阈值/%
叶片光合特征参数	临界值	估计值	95%置信区间	估计值	95%置信区间
净光合速率	22.3	71.2	[70.8，71.6]	52	[49，56]
蒸腾速率	7.43	70.8	[70.5，71.2]	49	[46，53]
气孔导度	0.38	70.5	[69.4，71.6]	46	[40，49]