热带农业工程2026，Vol.50Issue(2)：215-226,12.
褪黑素对盐胁迫下大丽花生长及光合特性的影响
Effects of Melatonin on Growth and Photosynthetic Characteristics of Dahlia under Salt Stress
摘要
Abstract
Dahlia pinnata Cav.is a perennial herbaceous plant widely used in landscape design for its vibrant flowers,diverse floral forms,and extended ornamental period.The entire plant also possesses medicinal value and is employed in treating various diseases.This experiment utilized three species of Dahlia as materials,with seven treatments established to investigate the effects of salt stress and exoge-nous melatonin on the growth and photosynthetic characteristics of Dahlia seedlings.The results demon-strated that under salt stress,Dahlia seedlings exhibited leaf wilting,yellowing,scorched leaf tips and margins,slender rhizomes,poor growth vigor,and significant reductions in plant height,leaf length,leaf width,leaf area,aboveground biomass,belowground biomass,and total biomass.The root-to-shoot ratio increased significantly,while stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci),and net photosynthetic rate(Pn)declined markedly.After exog-enous melatonin application,the yellowing and wilting of Dahlia seedlings was significantly reduced,with notable increases in plant height,leaf length,leaf width,leaf area,aboveground and below-ground biomass,and total biomass.The root-to-shoot ratio decreased significantly,while stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci),and net photosyn-thetic rate(Pn)increased substantially.关键词
大丽花/盐胁迫/褪黑素/生长特性/光合特性Key words
Dahlia/salt stress/melatonin/growth characteristics/photosynthetic characteristics分类
农业科技引用本文复制引用
秦涛,刘文兰..褪黑素对盐胁迫下大丽花生长及光合特性的影响[J].热带农业工程,2026,50(2):215-226,12.基金项目
甘肃农业大学科技创新基金"学科建设专项基金"(No.GAU-XKJS-2018-114) （No.GAU-XKJS-2018-114）
甘肃省高等学校创新能力提升项目(No.2019B-072) （No.2019B-072）
甘肃省林业和草原局林草科技创新与合作项目(No.kjcx2021004) （No.kjcx2021004）
国家自然科学基金项目(No.31360569). （No.31360569）
