Enhanced Ultraviolet-B Radiation Suppresses Magnaporthe oryzae Infection and Alleviates Its Damage to the Photosynthesis of Rice Leaves  

作　　者：Qinghao Zhang Yijie Yang Jiong Wu Hongru Li Yuan Li Zuran Li Yongmei He 

机构地区：[1]College of Resources and Environment,Yunnan Agricultural University,Kunming,650201,China [2]College of Horticulture and Landscape,Yunnan Agricultural University,Kunming,650201,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第10期2613-2628,共16页国际实验植物学杂志（英文）

基　　金：funded by the National Natural Science Foundation of China(32060287);the Scientific Research Fundation Project of Yunnan Provincial Department of Science and Technology,Yunnan,China(202301BD070001-014).

摘　　要：In the present study,an indoor potting experiment was conducted to study the effects of enhanced UV-B radiation and Magnaporthe oryzae on the growth,stomatal structure,photosynthesis,and endogenous hormone contents of a traditional rice cultivar Baijiaolaojing in the Yuanyang terraces of Yunnan Province.In addition,the relationships between these parameters and disease indices were analyzed.We aimed to clarify the response of the photosynthetic physiology of rice under the combined stress of UV-B radiation and M.oryzae.Compared with the M.oryzae infection treatment,all the treatments,including M.oryzae infection before(MBR),simultaneously with(MSR),and after(MAR)UV-B radiation significantly increased the rice height and biomass by 4%–11%and 30%–111%,respectively,and the stomatal structure and carotenoids content of leaves,while decreasing the contents of chlorophyll a and b,by 21%–41%and 63%–73%,respectively.Both the MSR and MBR treatments significantly increased the photosynthetic rate and transpiration rate of rice leaves.The MAR treatment weakened chlorophyll fluorescence parameters,including the actual photosystem II(PS II)photochemical efficiency,electron transport rate,photochemical quenching,and nonphotochemical quenching by 40%,39%,43%,and 24%,respectively.Moreover,the treatments of MAR,MSR,and MBR decreased the phytohormones content and the M.oryzae disease index by 27%–62%in rice leaves.Thus,the enhanced UV-B radiation contributed to suppressing the M.oryzae infection and alleviating its damage to the photosynthesis of rice leaves.This study is valuable for the control of rice blast fungus and offers important insights into plant pathology.

关 键 词：RICE UV-B radiation rice blast disease HORMONES plant responses 

分 类 号：S435.111.41[农业科学—农业昆虫与害虫防治]