Microalgae Improve the Photosynthetic Performance of Rice Seedlings(Oryza sativa L.)under Physiological Conditions and Cadmium Stress  

作　　者：Ekaterina Yotsova Martin Stefanov Georgi Rashkov Margarita Kouzmanova Anelia Dobrikova Emilia Apostolova 

机构地区：[1]Institute of Biophysics and Biomedical Engineering,Bulgarian Academy of Sciences,Sofia,Bulgaria [2]Department of Biophysics and Radiobiology,Biological Faculty,Sofia University,Sofia,Bulgaria

出　　处：《Phyton-International Journal of Experimental Botany》2022年第7期1365-1380,共16页国际实验植物学杂志（英文）

基　　金：the Project No.137/12.05.2016 of the Program for Career Development of Young Scientists,Bulgarian Academy of Sciences。

摘　　要：The aim of this study was to assess the impact of the microalgae Chlorella vulgaris on the rice seedlings at physiological conditions and under cadmium(Cd)stress.We examined the effects of C.vulgaris in the nutrient solution on rice seedlings grown hydroponically in the presence and the absence of 150μM CdCl2,using the low(77 K)temperature and pulse amplitude modulated(PAM)chlorophyll fluorescence,P700 photooxidation measurements,photochemical activities of both photosystems,kinetic parameters of oxygen evolution,oxidative stress markers(MDA,H_(2)O_(2) and proline),pigment content,growth parameters and Cd accumulation.Data revealed that the application C.vulgaris not only stimulates growth and improves the functions of photosynthetic apparatus under physiological conditions,but also reduces the toxic effect of Cd on rice seedlings.Furthermore,the presence of the green microalgae in the nutrient solution of the rice seedlings during Cd exposure,signifi-cantly improved the growth,photochemical activities of both photosystems,the kinetic parameters of the oxygen-evolving reactions,pigment content and decreased lipid peroxidation,H_(2)O_(2) and proline content.Data showed that the alleviation of Cd-induced effects in rice seedlings is a result of the Cd sorption by microalgae,as well as the reduced Cd accumulation in the roots and its translocation from the roots to the shoots.

关 键 词：Chlorella vulgaris growth parameters low temperature chlorophyll fluorescence PAM chlorophyll fluorescence PHOTOSYNTHESIS rice stress markers 

分 类 号：S511[农业科学—作物学]