Abstract:
Objective To study the effects of five different plant growth regulators on the growth process, photosynthetic characteristics, and physiological and biochemical indicators of cotton under sustained drought stress during the flowering and boll stage and screen for the best plant growth regulator that can improve the drought resistance of cotton during the flowering and boll stage.
Methods Xinluzao 52 was used as the test variety, and the spraying water was used as the control group. Coronatine+S-abscisic acid (SC), 24-epibrassinolide, paclobutrazol, calcium cyclamate and prochloraz were selected. Under the condition of no irrigation for 20 days at the flowering and boll stage, each regulator was sprayed at the recommended concentration. Through randomized block trials, the effects of agronomic traits, photosynthesis, enzyme activity, yield and other indicators were investigated and analyzed 20 days later.
Results Under drought stress, the tested plant growth regulators could enhance the drought resistance of cotton during the flowering and boll stage to a certain extent. The cotton plant height and stem diameter increased, and the aboveground dry matter, fresh weight, and seed cotton yield increased; There were certain differences in the degree of regulation of drought resistance in cotton during the flowering and boll period by different plant growth regulators. Among them, spraying "Bihu" had the best treatment effect.
Conclusion Plant growth regulators enhance the adaptability of cotton plants to arid environments and can serve as a compensatory pathway to reduce the damage of water deficiency to cotton during the flowering and boll period, which is beneficial for high and stable cotton production. The comprehensive evaluation ranking is SC > fresh amine > paclobutrazol > calcium tetracycline > 24-epibrassinolide > control.
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