Effect of Mepenzolate Compounding with Plant Growth Regulator on Spatiotemporal Distribution of Boll Formation and Endogenous Hormones in Cotton
ZHANG Ning
ZHANG Yongli
LIU Yujie
TU Xiaoju
ZHOU Zhonghua
LIU Aiyu
Abstract：Mepenzolate(DPC)compounding with plant growth regulator can effectively increase cotton yield.To clarify its effect on the law of boll formation in cotton,DPC was selected to be compounded with sodium nitroprusside(CSN),brassinolide(BR),sodium naphthylacetate(SNA),and phthalanilic acid(PHA),and a single application of DPC was used as the control.Three sprays were carried out at the budding stage,the pre-boll stage and the peak boll stage,and the effects of different compound combinations on the canopy structure,spatiotemporal distribution of boll formation,endogenous hormones,and yield were analyzed.The results showed that compared with the control,the compound treatment increased the leaf area index of cotton at the flowering boll stage,resulting in a significant decrease in the light transmittance of the lower canopy.The compound treatment increased the average growth rate of each reproductive organ and increased the number of flocculent bolls,and the number of cotton bolls increased by 35.88%—46.76%compared with the control.The compound treatment had a great effect on the vertical distribution of cotton bolls,the boll proportion in the lower part decreased compared with the control,but it increased the proportion of bolls in the middle and upper parts.The contents of indole acetic acid(IAA)and abscisic acid(ABA)in leaves could be reduced by compound treatment 10 days after the first application,and the gibberellins(GA3)content of DPC compounding with BR was significantly higher than that of the control at 30 days after application,and the compound treatment could significantly regulate the increase of zeatin riboside(ZR)content.Compared with the control,the boll formation rate of the compound treatment was significantly increased by 9.97%—16.85%,the number of bolls per hectare was significantly increased by 9.20%—17.22%,and the lint yield was significantly increased by 10.33%—22.30%.In conclusion,DPC compound treatment optimizes the spatiotemporal distribution of boll formation by regulating cotton endogenous hormones,which significantly increases the boll rate and thus increases cotton yield.
Keywords：CottonPlant growth regulatorMepenzolateSpatiotemporal distribution of boll formationEndogenous hormones
Publication Date：2025-02-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：10( 48-57 )