Arbuscular mycorrhizal fungi improve biomass, photosynthesis, and water use efficiency of Opuntia ficus-indica (L.) Miller under different water levels  

作　　者：Teame G KEBEDE Emiru BIRHANE Kiros-Meles AYIMUT Yemane G EGZIABHER 

机构地区：[1]Department of Land Resource Management and Environmental Protection,College of Dryland Agriculture and Natural Resource,Mekelle University,Mekelle 231,Ethiopia [2]Department of Animal Production and Technology,College of Agriculture and Environmental Science,Adigrat University,Adigrat 50,Ethiopia [3]Institute of Climate and Society,Mekelle University,Mekelle 231,Ethiopia [4]Department of Dryland Crop and Horticultural Science,College of Dryland Agriculture and Natural Resource,Mekelle University,Mekelle 231,Ethiopia

出　　处：《Journal of Arid Land》2023年第8期975-988,共14页干旱区科学（英文版）

基　　金：supported by the Ethiopian Ministry of Education.

摘　　要：Opuntia ficus-indica(L.)Miller is a CAM(crassulacean acid metabolism)plant with an extraordinary capacity to adapt to drought stress by its ability to fix atmospheric CO_(2) at nighttime,store a significant amount of water in cladodes,and reduce root growth.Plants that grow in moisture-stress conditions with thick and less fine root hairs have a strong symbiosis with arbuscular mycorrhizal fungi(AMF)to adapt to drought stress.Water stress can limit plant growth and biomass production,which can be rehabilitated by AMF association through improved physiological performance.The objective of this study was to investigate the effects of AMF inoculations and variable soil water levels on the biomass,photosynthesis,and water use efficiency of the spiny and spineless O.ficus-indica.The experiment was conducted in a greenhouse with a full factorial experiment using O.ficus-indica type(spiny or spineless),AMF(presence or absence),and four soil water available(SWA)treatments through seven replications.Water treatments applied were 0%–25%SWA(T1),25%–50%SWA(T2),50%–75%SWA(T3),and 75%–100%SWA(T4).Drought stress reduced biomass and cladode growth,while AMF colonization significantly increased the biomass production with significant changes in the physiological performance of O.ficus-indica.AMF presence significantly increased biomass of both O.ficus-indica plant types through improved growth,photosynthetic water use efficiency,and photosynthesis.The presence of spines on the surface of cladodes significantly reduced the rate of photosynthesis and photosynthetic water use efficiency.Net photosynthesis,photosynthetic water use efficiency,transpiration,and stomatal conductance rate significantly decreased with increased drought stress.Under drought stress,some planted mother cladodes with the absence of AMF have not established daughter cladodes,whereas AMF-inoculated mother cladodes fully established daughter cladodes.AMF root colonization significantly increased with the decrease of SWA.AMF caused an increase in biomass

关 键 词：BIOMASS cactus pear cladode growth PHOTOSYNTHESIS water stress water use efficiency 

分 类 号：Q945[生物学—植物学]