Effects of Melatonin on Growth，Photosynthetic Characteristics and Yield of Solanum tuberosum L.under Drought Stress

doi:10.15933/j.cnki.1004-3268.2025.05.005

Abstract

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 CO₂ concentration（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.

Key words: Solanum tuberosum L., Melatonin, Drought stress, Growth and development, Yield

摘要： 采用10% PEG6000溶液模拟干旱环境，研究不同浓度［0（CK）、50（W1）、100（W2）、150（W3）、200（W4）μmol/L］褪黑素对干旱胁迫下马铃薯生长发育、光合特性和产量的影响，以期为马铃薯在干旱环境下的栽培管理提供参考。结果表明，喷施不同浓度的褪黑素均可以促进马铃薯在干旱胁迫条件下的生长发育，进而提高产量；随着褪黑素浓度增加，马铃薯生长发育、光合特性指标及产量总体上均呈先增加后降低的趋势，以W2处理最高。与CK相比，喷施后17 d，W2处理马铃薯株高、茎粗、叶片厚度和根长分别提高24.79%、13.89%、61.11%和29.95%，根干质量、根鲜质量、地上部干质量和地上部鲜质量分别提高36.95%、23.32%、156.52%和42.05%，SPAD值、净光合速率、气孔导度、胞间二氧化碳浓度和蒸腾速率分别提高63.60%、41.34%、30.45%、44.73% 和114.56%，单株产量和单株结薯数分别提高71.04%和150.00%。综上所述，喷施褪黑素可促进干旱胁迫下马铃薯的生长发育，进而提高产量，以喷施100 μmol/L褪黑素处理效果最好。

关键词: 马铃薯, 褪黑素, 干旱胁迫, 生长发育, 产量

CLC Number:

S532

FAN Zhiyuan, WEI Hui, HE Yuheng, GU Chengzhi, LI Jinchao, FENG Chunjing, LIU Suhui. Effects of Melatonin on Growth，Photosynthetic Characteristics and Yield of Solanum tuberosum L.under Drought Stress[J]. Journal of Henan Agricultural Sciences, 2025, 54(5): 41-48.

范志远, 尉辉, 赫宇恒, 顾城志, 李锦超, 冯春静, 刘素慧. 褪黑素对干旱胁迫下马铃薯生长发育、光合特性和产量的影响[J]. 河南农业科学, 2025, 54(5): 41-48.

Figures/Tables 10

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