热带作物学报2017，Vol.38Issue(10)：1823-1829,7.DOI:10.3969/j.issn.1000-2561.2017.10.009
外源5-氨基乙酰丙酸对干旱胁迫下降香黄檀幼苗生长、根系生理特性的影响
Effects of Exogenous 5-aminolevulinic Acid on Growth and Root Physiological Characteristics of Dalbergia odorifera T.chen Under Drought Stress
摘要
Abstract
Taking 1.5-year old Dalbergia odorifera T.chen as the test materials,a hydroponic experiment was conducted to study the effects of different concentrations (0,10,25,50,100 mg/L) 5-aminolevulinic acid (5-ALA) on the growth and root physiological characteristics of D.odorifera T.chen under drought stress.Their physiological and biochemical indices including organic osmolytes content,photosynthesis and antioxidant system.were studied.The results showed that the seedlings exposed to 20％ polyethylene glycol 6000 (PEG-600) for 14 d exhibited a decrease in seedling height,ground diameter,root,stem and leaf dry mass,relative water content of leaf,chlorophyll a.chlorophyll b,carotenoid.In PEG-stressed plants,malondialdehyde (MDA) was signficantly increased,whereas antioxidative activity,including superoxide (SOD),peroxidase (POD),and soluble protein content and soluble sugar content declined in roots.However,exogenous 5-aminolevulinic acid provided an effective method of mitigating PEG-caused physiological stresses on the seedlings,and the best effects were found in the treatment by 25 mg/L 5-aminolevulinic acid,in which the relative water content of the leaf,chlorophyll a,chlorophyll b,carotenoid,superoxide,peroxidase,and soluble protein content and soluble sugar content increased by 157.95％,34.44％,33.33％,24.49％,84.66％,87.66％,59.23％,76.8％,62.72％,respectively,although MDA of the root decreased by 37.81％.The results suggested that 25 mg/L exogenous 5-aminolevulinic acid is favorable to maintain the oxygen metabolism and decrease the level of membrance lipid peroxidation,which enhances the ability of resisting drought stress of D.odorifera T.chen seedlings.关键词
降香黄檀幼苗/干旱胁迫/外源5-氨基乙酰丙酸/水培Key words
Dalbergia odorifera T.chen seedling/drought stress/5-aminolevulinic acid/hydroponic experiment分类
农业科技引用本文复制引用
王宏信,剧春晖,李向林,陈博,冷凝..外源5-氨基乙酰丙酸对干旱胁迫下降香黄檀幼苗生长、根系生理特性的影响[J].热带作物学报,2017,38(10):1823-1829,7.基金项目
海南省自然科学基金(No.317181) （No.317181）
海南省高等学校科学研究重点项目(No.HNKY2016ZD-13). （No.HNKY2016ZD-13）
