4种植物生长调节剂对苦荞农艺及产量相关性状的影响OA

[Objective]To solve the problem of low and unstable yield that restricts the development of buckwheat industry,explore the potential of plant growth regulators(PGRs)on increasing buckwheat yield,this study analyzed the effects of triiodobenzoic acid(TIBA),brassinolide(BR),daminozide(B9),and ethephon(ETH)on agronomic traits,flowering and fruiting,and yield-related traits of buckwheat,to select PGRs that significantly increase the yield of Tartary buckwheat,and provide theoretical basis and technical support for the application of chemical control technology in high-yield cultivation of Tartary buckwheat.[Method]The Tartary buckwheat cultivar"Chuanqiao No.1"was used as the test material,the leaves were sprayed with appropriate concentrations of TIBA,EBR,B9,ETH and equal amount of water(control)at the beginning of flowering for two consecutive years,and the differences in agronomic traits,flowering and fruiting,and yield-related characteristics among the treatment groups were com-pared and analyzed.[Result]The four PGRs had no significant effects on agronomic traits,although dif-ferences were observed between years(plant height and main stem branch number were generally higher in 2021 than in 2022).In both years of field trials,TIBA and BR treatments significantly increased the seed-setting rate,grain number per plant,and grain weight per plant.Among these,BR treatment dem-onstrated stable yield-increasing effects,increasing yield by 12.2%and 9.8%compared to the control in the two years,respectively,while also significantly enhancing grain number per plant and grain weight per plant.TIBA and ETH significantly promoted yield in 2021,but showed inconsistent effects in 2022.Correlation analysis revealed that the yield was significantly positively correlated with the number of ma-ture grains,grain number per plant,grain weight per plant,and seed setting rate.[Conclusion]Foliar application of TIBA,BR,and ETH at the initial flowering stage can increase tartary buckwheat yield.Among them,BR exhibits the best and most stable yield-increasing effect,primarily achieved by en-hancing the seed setting rate,grain number per plant,and grain yield per plant.