Sun, Qizhong

Zhao, Jinmei

Zhou, He

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Comparison on Water‐Stress Tolerance of Three Alfalfa Varieties Jinmei Zhao Chinese Academy of Agricultural Sciences, China He Zhou China Agricultural University, China Qizhong Sun Chinese Academy of Agricultural Sciences, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/1-6/16 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]265　 瞯Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsComparison on water‐stress tolerance of three alfalfa varietiesZhao j inmei1 , Zhou He2 , Sun Qiz hong11 G rassland Research Institute , CA A S , Wulanchabu East Road 120 , Huhhot , 010010 , China , E‐mail :z hao j inmei 3276 ＠126 .com , 2 College o f A nimal Science and Technology , CAU , Y uanmingyuan West Road 2 , Bei j ing , 10094 ,ChinaKey words : alfalfa , water stress , betain , ABA , net photosynthesis rate , stoma conductanceIntroduction Alfalfa ( Medicago stiv ia L .) is a legume forage with high production and excellent quality , and is cultivated in themost world . In China , alfalfa mainly is plants in the arid and semi‐arid zones . So it always suffers water‐stress which effectedalfalfa performance . The study compared three alfalfa varieties on the change of drought physiological indexes and their droughttolerance (Xing , Rajasheka , ２００１) .Materials and methods Three alfalfa varieties were planted in pots in greenhouse . Water‐stress treatment was controlled byweighing pot every two days . In this experiment , there were four drought levels , including CK , LS , MS and SS . Leafe betaincontent , ABA content , net photosynthesis rate ( NPR) and stoma conductance were measured .Results Zhongmu１ and Aohan had higher betain content than Queen under water stress ( Figure１ ) . There had two changemodels of ABA content , double‐apex model and single apex model respectively . ABA accumulation of double apex varieties wasearlier than that of single apex variety . Among the alfalfa varieties , Aohan摧 NPR was highest under water stress . The mainfactor of alfalfa NPR was stoma closure in this experiment But under SS treatment , Queen摧s stoma conductance significantlyincreased , extra‐cell CO２ concentration also increased ( data not show ) , so the main factor of Queen摧s NPR was non‐stomaeffect ( Gunaselera , Berkowits , １９９２ ) .Figure 1 The change o f betain content , A BA content , N PR , stoma conductance o f three al f al f a varieties under di f f erentw ater stress degrades .Conclusions Based on the change of three alfalfa varieties on betain content , ABA content , net photosynthesic rate and stomaconductance under water stress , betain osmoregulation and ABA stress inducement are the most important mechanism of alfalfawater‐stress resistance and acclimation . Queen is less tolerance to drought than Aohan and Zhongmu１ ,and has different water‐stress tolerance formability .ReferencesGunasekera D . , Berkowits G .A .( １９９２ ) . Heteopnious stomatal closure in response to leaf water deficits is not a universalphenomenon . Plant Physiol , ９６ , ６６０‐６６５ .Xing W . ,Rajashekar C .B . (２００１) . Glycine betaine involvement in freezing tolerance and water stress in Arabidopsisthaliana . Env iron Ex perimental Botany ,４６ , ２１‐２８ .400 A Betain content ---ir- Zhongm (ug/g FW) 2000 B 300 u1 -:!:- Queen 200 1000 100 0 0 CK LS MS ss CK LS MS ss 25 C Net photosynthesis rate 100 D Stomati conductance 20 ~ lm'ls) (mmol/m2 /s) 75 15 50 10 :i: 5 25 :i: 0 0 CK LS MS ss CK LS MS ss Water stress degrades 

Comparison on Water‐Stress Tolerance of Three Alfalfa Varieties

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Comparison on Water‐Stress Tolerance of Three Alfalfa Varieties

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