中国农业科技导报2024，Vol.26Issue(3)：57-65,9.DOI:10.13304/j.nykjdb.2022.0865
混合盐碱胁迫对骏枣叶片结构和光合荧光特性的影响
Effect of Mixed Saline-alkali Stress on Leaf Structure and Photosynthetic Fluorescence Properties of Jujube
摘要
Abstract
To further investigate the physiological response mechanisms of jujube to mixed saline-alkali stress,the experiment was conducted to simulate soil salinity stress by different concentrations of NaCl and NaHCO3 at full fruit period of Junzao,including 0,60,120,180,240 and 300 mmol·L-1.The changes of microstructure,ultrastructure,photosynthesis and fluorescence parameters of Junzao leaves under different stress levels were analyzed.The results showed that,with the increase of salt concentration,the leaf thickness,cuticle thickness,epidermal thickness and fenestrated tissue thickness of jujube showed a trend of increasing and then decreasing,and the thickness of spongy tissue and cell structure laxity gradually decreased.When salt concentrations was higher than 180 mmol·L-1,the number of osmiophilic particles in chloroplasts increased significantly,their size became larger,and the structure of stromal lamellae was loosened.Meanwhile,with the increase of stress level,net photosynthetic rate,stomatal conductance and transpiration rate gradually decreased,intercellular CO2 concentration increased,which indicated photosynthetic limitation was dominated by non-stomatal factors.Under high level treatments of 240 and 300 mmol·L-1,Fo significantly increased,while Fm,Fv/Fm,Fv/Fo significantly decreased,ABS/RC,TRo/RC and DIo/RC showed an overall trend of first decrease and then increase,and ETo/RC showed a continuous decreasing trend.In conclusion,higher saline-alkali stress could cause significant changes in the ultrastructure of Junzao leaves,inhibite the photosynthetic capacity,increase the size and number of osmiophilic vesicles,and appear the starch grains,which provided a theoretical basis for the in-depth study of the salt tolerance mechanism of jujube.关键词
混合盐碱胁迫/枣/显微结构/超微结构/光合日变化/荧光参数Key words
mixed saline-alkali stress/jujube/microstructure/ultrastructure/photosynthetic daily variation/fluorescence parameters分类
农业科技引用本文复制引用
闫敏,王艳,王程成,郭松超,卢登洋,吴翠云..混合盐碱胁迫对骏枣叶片结构和光合荧光特性的影响[J].中国农业科技导报,2024,26(3):57-65,9.基金项目
新疆生产建设兵团创新创业平台建设项目(2019CB001) （2019CB001）
兵团十四师农业农村局委托项目(2021011) （2021011）
自治区研究生创新计划项目(XJ2020G270). （XJ2020G270）
