不同外源调节剂对马铃薯生长、产量及品质的影响OA

Prolonged rainy and low-light conditions are a major stress affecting early spring potato growth in southern regions.To identify regulators promoting early spring potato growth and yield,this study used the'Xiangshu 5'as materials and conducted field trials investigating the effects of regulators such as paclobutrazol(T1),potassium dihydrogen phosphate(T2),melatonin(T3),and brassinolide(T4)on the growth,yield,and quality of early spring potatoes.The four regulators only induced differential changes in numerical values across various potato traits,with most indicators showing no statistically significant differences between treatments,while a few specific metrics exhibited significant inter-group variations.T3 treatment(melatonin)achieved the highest yield among all treatments,exhibited significantly higher tuber yield per plant compared to T2 treatment(potassium dihydrogen phosphate),and showed only a numerical advantage in tuber weight,with no significant differences in total yield across groups.T1 treatment(paclobutrazol)resulted in the lowest plant height,increased stem diameter,and exhibited a growth-regulating phenotype in the field.Its tuber dry matter and starch contents were significantly higher than those of CK,and it showed the highest numerical value of vitamin C content.However,there were no overall significant differences in quality indicators among the growth regulator treatments,indicating no statistically comprehensive quality advantage.Correlation analysis revealed that stem diameter was highly significantly positively correlated with yield(r=0.731),and tuber weight was significantly positively correlated with tuber yield per plant(r=0.629).Based on the experimental data,melatonin demonstrated a numerical advantage in yield,while paclobutrazol significantly improved stem characteristics and enhanced tuber dry matter and starch content.However,no significant inter-group differences were observed across all quality metrics,making it impossible to determine superior overall performance of any treatment.These findings should be considered as reference for exogenous regulator application in early spring potato cultivation under adverse conditions in southern regions,with practical efficacy requiring further localized validation.This study provides theoretical insights for the use of exogenous regulators in early spring potato cultivation under rainy and low-light environments.