Effects of Melatonin on Growth,Photosynthetic Characteristics and Yield of Solanum tuberosum L.under Drought Stress
FAN Zhiyuan
WEI Hui
HE Yuheng
GU Chengzhi
LI Jinchao
FENG Chunjing
LIU Suhui
Abstract：The 10%PEG6000 solution was employed to simulate drought stress,and the effects of melatonin concentrations[0(CK),50(W1),100(W2),150(W3),200(W4)μmol/L]on the growth,photosynthetic characteristics and yield of potato(Solanum tuberosum L.)were studied under drought stress,so as to provide theoretical guidance for cultivation of potato under drought stress.The results showed that different concentrations of melatonin could promote the growth and development of potato under drought stress,and then increase the yield.With the increase of melatonin concentration,growth and development,photosynthetic characteristics and yield of potato increased first and then decreased,and W2 treatment was the highest.Compared with CK,the plant height,stem diameter,leaf thickness and root length of W2 treatment increased by 24.79%,13.89%,61.11%and 29.95%at 17 d after spraying,respectively;Dry weight and fresh weight of root,dry and fresh weight of aboveground part increased by 36.95%,23.32%,156.52%and 42.05%,respectively;SPAD value,net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO₂concentration(Ci)and transpiration rate(Tr)increased by 63.60%,41.34%,30.45%,44.73%and 114.56%,respectively;Yield per plant and tuber number per plant increased by 71.04%and 150.00%,respectively.In conclusion,melatonin can promote the growth and development,increase the yield of potato under drought stress,and 100 μmol/L melatonin has the best effect.
Keywords：Solanum tuberosum L.MelatoninDrought stressGrowth and developmentYield
Publication Date：2025-05-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 41-48 )