亚热带地区越冬期小叶榕和红叶石楠叶片叶绿素荧光成像特性的比较  

COMPARISON OF CHLOROPHYLL FLUORESCENCE IMAGING CHARACTERISTICS OF LEAVES IN FICUS MICROCARPA AND PHOTINIA×FRASERI IN THE SUBTROPICAL REGION DURING OVERWINTERING

作　　者：胡文海[1,2] 万雨晨 陈雅琴 黄苗青 曾薇 HU Wen-hai;WAN Yu-cheng;CHEN Ya-qing;HUANG Miao-qing;ZENG Wei(School of Life Sciences,Jingganshan University,Ji’an,Jiangxi 343009,China;Key Laboratory for Biodiversity Science and Ecological Engineering of Jiangxi Province,Ji’an,Jiangxi 343009,China)

机构地区：[1]井冈山大学生命科学学院,江西吉安343009 [2]江西省生物多样性与生态工程重点实验室,江西吉安343009

出　　处：《井冈山大学学报（自然科学版）》2023年第1期46-53,共8页Journal of Jinggangshan University (Natural Science)

基　　金：国家自然科学基金项目(41961005)。

摘　　要：以冷敏感植物小叶榕和耐冷植物红叶石楠为材料,比较了两种常绿阔叶植物阳生叶和阴生叶的叶绿素荧光成像特性,以探索亚热带地区不同耐冷性常绿阔叶植物的越冬光保护策略。结果表明,越冬期小叶榕阳生叶具有较低的光化学反应和热耗散能力,低温强光导致小叶榕阳生叶严重光抑制的发生,并引起其光合活性面积的减少。处于弱光环境下的小叶榕阴生叶仅发生轻微光抑制,也未引起光合活性区域的减少,可通过维持相对较高的热耗散能力防御低温光抑制。越冬期的红叶石楠阳生叶和阴生叶均仅发生轻微光抑制,也未引起光合活性区域的减少。红叶石楠通过维持较强的光化学反应和热耗散能力,而阴生叶则主要是通过热耗散途径防御低温光抑制。两种植物的阳生叶和阴生叶均能够通过主动关闭叶片部分光合活性区域PSII反应中心,并提高剩余有活性的PSII反应中心光化学反应能力来防御低温光抑制。尤其是小叶榕阳生叶,低温强光显著提升了少数光合活性区域的光化学反应和热耗散能力,采取重点保护部分叶片区域的越冬光保护策略。To investigate the photoprotective strategies of evergreen broad-leaved plants with different chilling tolerance in the subtropical region during overwintering,Ficus microcarpa(chilling-sensitive plant)and Photinia×fraseri(chilling-tolerant plant)were used as the research materials for this experiment.Chlorophyll fluorescence imaging of the shade-and sun-leaves in two plants were measured,and their characteristics were compared.The results showed that the sun-leaves in F.microcarpa had the lower photochemical capacity and thermal energy dissipation during overwintering period.Low temperature with high light led to serious photoinhibition and reduced the area of photosynthetically active regions on the sun-leave in F.microcarpa.The shade-leaves in F.microcarpa only had slight photoinhibition and did not cause the reduction of photosynthetically active regions,which might be due to maintaining high thermal energy dissipation.Both the sun-and shade-leaves in P.×fraseri had only slight photoinhibition and also did not cause the reduction of photosynthetically active regions.The sun-leaves in P.×fraseri maintained high photochemical capacity and thermal energy dissipation,and the shade-leaves only possessed strong thermal energy dissipation,to defend against chilling photoinhibition during overwintering periods.Interestingly,for the sun-and shade-leaves in the two evergreen broad-leaved plants during overwintering periods,chilling stress closed some active PSII reaction centers in photosynthetically active regions and improved the operating efficiency of the remaining active PSII reaction reactions to defend against chilling photoinhibition.Especially for the sun-leaves in F.microcarpa,chilling with high light significantly improved the photochemical capacity and thermal energy dissipation in photosynthetically active regions,and protected some photosynthetically active regions as the photoprotective strategy.

关 键 词：常绿阔叶植物 光保护策略 叶绿素荧光成像 越冬期 亚热带 

分 类 号：S642.2[农业科学—蔬菜学]