Growth and abscisic acid responses of <i>Medicago sativa</i> to water stress at different growth stages

doi:10.15302/J-FASE-2017199

Front. Agr. Sci. Eng.

2018, Vol. 5

Issue (1) : 80-86 https://doi.org/10.15302/J-FASE-2017199

RESEARCH ARTICLE

Growth and abscisic acid responses of Medicago sativa to water stress at different growth stages

Yue LI, Liqiang WAN, Yufei WANG, Xianglin LI(

)

Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China

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Abstract

A pot experiment was conducted in a greenhouse with three alfalfa (Medicago sativa) cultivars, Aohan, Zhongmu No.1 and Sanditi, to examine the morphological and physiological responses of alfalfa to water stress. The response of alfalfa to water stress at different growth stages was generally similar, but varied among cultivars. At the branching, flowering and podding stages, the shoot biomasses of Aohan and Zhongmu No.1 were greatly affected by, and responded quickly to, water stress. The shoot biomass of Sanditi was not affected by mild water stress, but had a slight response to moderate and severe water stress. The root/shoot ratios in Aohan and Zhongmu No.1 were more sensitive to water stress than in Sanditi, with the root/shoot ratio in Aohan increasing most significantly. At flowering, the root/shoot ratio was the highest and the effect of water stress the greatest. The abscisic acid (ABA) concentration in the roots of Aohan and Zhongmu No.1 increased under water stress, while in Sanditi there was only a slight or delayed response of ABA concentration.

Keywords abscisic acid alfalfa drought response growth stage water deficit

Corresponding Author(s): Xianglin LI

Just Accepted Date: 27 December 2017 Online First Date: 02 February 2018 Issue Date: 21 March 2018

Cite this article:

Yue LI,Liqiang WAN,Yufei WANG, et al. Growth and abscisic acid responses of Medicago sativa to water stress at different growth stages[J]. Front. Agr. Sci. Eng. , 2018, 5(1): 80-86.

URL:

https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2017199
https://academic.hep.com.cn/fase/EN/Y2018/V5/I1/80

Tab.1 Effect of water stress on shoot biomass, root/shoot ratio and root ABA concentration of alfalfa at branching

Fig.1 Effect of water stress on leaf water potential of alfalfa plants. Means with the same lowercase or uppercase letters are not significantly different (P>0.05 or P>0.01), respectively.

Fig.2 Effect of water stress on relative leaf water content of alfalfa plants. Means with the same lowercase or uppercase letters are not significantly different (P>0.05 or P>0.01), respectively.

Tab.2 Effect of water stress on shoot biomass, R/S and root ABA concentration of alfalfa at flowering

Tab.3 Effect of water stress on shoot biomass, R/S and root ABA concentration of alfalfa at podding

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