农业研究与应用2025，Vol.38Issue(5)：475-483,9.DOI:10.20191/j.cnki.2095-0764.2025.05.007
高温干旱胁迫对芒果幼树生理生化指标的影响
Impact of High Temperature and Drought Stress on Physiological and Biochemical Indi-cators of Young Mango Trees
摘要
Abstract
[Objective]Mango(Mangifera indica L.)is the world's second-largest tropical fruit,known as the"King of Tropical Fruits".Climate conditions directly affect mango yield and quality,and particularly,global warming has led to frequent extreme weathers such as high temper-atures and droughts,which severely threaten mango production.This study aimed to explore the physiological response mechanisms of mango to high temperature,drought,and combined high temperature and drought stress,providing a reference for mango cultivation management under high temperature and drought conditions.[Method]Using 2-year-old potted saplings of Tainong No.1 and Jinhuangmang as experimental materials,a control group(CK)was set up with room tempera-ture(25℃)and soil moisture of 60％field capacity.Three drought gradients were established:mild drought(D-L),moderate drought(D-M),and severe drought(D-W),with soil moisture of 50％,40％,and 30％of field capacity,respectively,under room temperature(25℃).The high-temperature environment naturally formed in plastic greenhouse during the high-temperature sum-mer season was used for simulated stress.Through meteorological monitoring,the time when tem-perature inside the greenhouse rose to(40±2)℃was selected for high-temperature treatment,and the treatment duration was controlled according to the preset scheme(2,4,and 8 h).Three high-temperature treatments were set up:high temperature at 40℃ for 2 h(H-L),4 h(H-M),and 8 h(H-W).The combination of moderate drought(D-M)and 40℃treatment for 4 h(H-M)was set as the high-temperature and drought combined stress treatment(HD).Indicators such as chlorophyll content,photochemical efficiency of Photosystem Ⅱ(Fv/Fm),malondialdehyde(MDA)content,proline(Pro)content,superoxide dismutase(SOD)activity,peroxidase(POD)activity,and cata-lase(CAT)activity in mango leaves under high temperature,drought,and combined stress were measured.[Result]Under varying degrees of high temperature,drought,and combined high tem-perature and drought stress,both the chlorophyll content and Fv/Fm ratio in leaves of Tainong No.1 and Jinhuangmang significantly decreased(P<0.05).The decreases in chlorophyll content and Fv/Fm ratio were more pronounced in Tainong No.1(up to 41.8％and 32.5％)significantly greater than those in Jinhuangmang(up to 27.3％and 20.1％).This indicated that the photosynthetic system of Jinhuangmang was less damaged.The MDA content significantly accumulated with a higher in-crease in Tainong No.1(156.7％)compared to Jinhuangmang(138.2％)under combined stress.Un-der single stress,the average increase in MDA content in Tainong No.1(104.46％)was also higher than that in Jinhuangmang(75.89％),suggesting a lower degree of membrane lipid peroxidation in the latter.Under mild to moderate stresses,the activities of SOD,POD,and CAT increased,while they decreased under severe and combined stress,with a greater decrease in Tainong No.1,reflect-ing the stronger antioxidant system maintenance ability of Jinhuangmang.The proline content in-creased under high temperature stress but decreased under drought stress,and Jinhuangmang had higher proline content than Tainong No.1 in most cases,suggesting its higher superior potential for osmotic adjustment.Based on these indicators,Jinhuangmang exhibited better physiological stabili-ty under adversity compared to Tainong No.1.[Conclusion]Based on the performances of 7 physio-logical indicators,Jinhuangmang exhibited stronger drought and high temperature tolerance than Tainong No.1.关键词
芒果/高温/干旱/生理生化Key words
Mango/high temperature/drought/physiology and biochemistry分类
农业科学引用本文复制引用
邹杨,侯宪斌,李玉峰..高温干旱胁迫对芒果幼树生理生化指标的影响[J].农业研究与应用,2025,38(5):475-483,9.基金项目
百色市科学研究与技术开发计划项目(百科20241552) （百科20241552）
百色学院大学生创新性项目(202210609037). （202210609037）
