Summer Warming Limited Bud Output Drives a Decline in Daughter Shoot Biomass through Reduced Photosynthetis of Parent Shoots in Leymus chinensis Seedlings  

作　　者：Song Gao Ruocheng Xu Lin Li Jiao Wang Nian Liu Johannes M.H.Knops Junfeng Wang 

机构地区：[1]Graduate School,Changchun University,Changchun,130022,China [2]Key Laboratory of Vegetation Ecology,Ministry of Education,Institute of Grassland Science,School of Life Sciences,Jilin Songnen Grassland Ecosystem National Observation and Research Station,Northeast Normal University,Changchun,130024,China [3]Jilin Agricultural Radio and Television School,Changchun,130599,China [4]Department of Health and Environmental Sciences,Xi’an Jiaotong Liverpool University,Suzhou,215000,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第7期1667-1675,共9页国际实验植物学杂志（英文）

基　　金：funded by the NSFC(32371669);the Science and Technology Talent Project for Distinguished Young Scholars of Jilin Province(20240602009RC);the NSF of Jilin Province(20240101207JC);the Scientific Research Project of the Department of Education,Jilin Province(JJKH20230687KJ).

摘　　要：Understanding how summer warming influences the parent and daughter shoot production in a perennial clonal grass is vital for comprehending the response of grassland productivity to global warming.Here,we conducted a simulated experiment using potted Leymus chinensis,to study the relationship between the photosynthetic activ-ity of parent shoots and the production of daughter shoots under a whole(90 days)summer warming scenario(+3°C).The results showed that the biomass of parents and buds decreased by 25.52%and 33.45%,respectively,under warming conditions.The reduction in parent shoot biomass due to warming directly resulted from decreased leaf area(18.03%),chlorophyll a(18.27%),chlorophyll b(29.21%)content,as well as a reduction in net photosynthetic rate(7.32%)and the maximum quantum efficiency of photosystem II(PSII)photochemistry(4.29%).The decline in daughter shoot biomass was linked to a decrease in daughter shoot number(33.33%)by warming.However,the number of belowground buds increased by 46.43%.The results indicated that long-term summer warming reduces biomass accumulation in parent shoot by increasing both limitation of stoma and non-stoma.Consequently,the parent shoot allocates relatively more biomass to the belowground organs to maintain the survival and growth of buds.Overall,buds,as a potential aboveground population,could remedy for the cur-rent loss of parent shoot density by increasing the number of future daughter shoots if summer warming subsides.

关 键 词：Warming parent shoot bud bank photosynthesis chlorophyllfluorescence Leymus chinensis 

分 类 号：Q94[生物学—植物学]