|Table of Contents|

Effects of Exogenous Melatonin on Growth and Physiological Characteristics of Peony Under Drought Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2026年11
Page:
33-41
Research Field:
Publishing date:

Info

Title:
Effects of Exogenous Melatonin on Growth and Physiological Characteristics of Peony Under Drought Stress
Author(s):
LI Jing1; GUO Lingzi1; ZHU Man2; ZHANG Tingting1
(1.College of Landscape Architecture and Art,Xinyang Agriculture and Forestry University，Xinyang,Henan 464000;2.College of Horticulture,Xinyang Agriculture and Forestry University，Xinyang,Henan 464000)
Keywords:
peony seedling; drought stress; melatonin; physiological metabolism; photosynthetic parameter
PACS:
S685.11
DOI:
10.11937/bfyy.20260081
Abstract:
Taking one-year-old Paeonia ostii ‘Fengdan’ seedlings as the test materials,pot water control method was employed to create mild drought (LD),moderate drought (MD),and severe drought (HD) conditions.50 (T1),125 (T2),and 200 (T3) μmol·L-1 melatonin treatments were applied to investigate the alleviating effects of exogenous melatonin on seedling growth,photosynthesis,and physiological characteristics under varying drought stresses,in order to provide references for the cultivation and management of peony seedlings.The results showed that,under LD conditions,exogenous melatonin effectively mitigated the negative impacts of drought stress on plant growth and physiology.Under MD and HD conditions,plant leaf area,root biomass,shoot biomass,and chlorophyll a+b content decreased.As drought severity intensified,carboxylation efficiency showed a declining trend,while the relative limitation of photosynthetic function,PSⅡ excitation pressure,MDA content,SOD activity,and membrane damage index exhibited increasing trends.Correlation analysis indicated that five indicators,intercellular CO2 concentration,Fv/Fm,ΦPSⅡ,relative limitation of photosynthetic function under light,and membrane damage index could characterize the response of peony seedlings to drought stress.After rewatering,the membrane damage index of seedlings treated with T2 and T3 decreased by approximately 30%.Based on comprehensive membership function analysis and the dose-dependent effect of melatonin,exogenous application of 125 μmol·L-1 melatonin (T2) effectively alleviated drought stress and is suitable for practical cultivation management of peony seedlings.

References:

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Last Update: 2026-06-23