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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (02): 362-368.doi: 10.3724/SP.J.1006.2014.00362

• RESEARCH NOTES • Previous Articles     Next Articles

Cation-Responsive Mechanisms of Oats to Alkali Stress

SA Ru-La1,LIU Jing-Hui1,*,LIU Wei1,BAI Jian-Hui1,WANG Zhan-Hai2   

  1. 1Agricultural college, Inner Mongolia Agricultural University, Hohhot 010019, China; 2Institute of Agricultural Sciences, Hulun Buir 162650, China
  • Received:2013-05-08 Revised:2013-11-24 Online:2014-02-12 Published:2013-12-05
  • Contact: 刘景辉, E-mail: cauljh@aliyun.com, Tel: 0471-87281507

Abstract:

In a pot experiment, an alkali-tolerant oat variety, Vao-9, and an alkali-sensitive variety, Baiyan 5, were exposed to 25, 50, 75, and 100 mmol L-1 of alkali stress (molar ratio of Na2CO3-to=NaHCO3 = 1:1). The contents of Na+, K+, Ca2+, and Mg2+ absorbed by oat seedling and their distribution characteristics in root, stem, and leaf were measured after a short-term (14 d) or a long-term (28 d) stress treatment. The objective was to understand the physiological adaptation to alkali stress in oat in the view of ion balance absorption and distribution. After short-term stress, the cation contents in oat plants showed the variations of increased Na+, decreased K+, and minor changes in Ca2+ and Mg2+. Besides, the distribution proportions of the four ions in various organs were not significantly different between the two varieties. Compared to short-term stress, long-term stress resulted in larger increase of Na+ content and larger decreases of K+, Ca2+, and Mg2+ contents in all organs of both varieties. Vao-9 absorbed more Na+ and Ca2+ than Baiyan 5, and the absorptions of K+ and Mg2+ were not significantly different between varieties, but the distribution characteristics of the four ions in various organs were different between the two varieties.Under 100 mmol L-1 alkali stress, 5.9 percent Na+ in leaf were lower distributed and 13.5 percent K+, 28.9 Ca2+, 10.9 Mg2+ more distributed in Vao-9 than in Baiyan 5, 5.4 percent Na+ in stem higher and 9.8 K+ lower in Vao-9 than in Baiyan 5 , 28.9 Ca2+, 10.9 Mg2+ in root were lower in Vao-9 than in Baiyan 5, As a result, the Na+ content and the ratios of Na+/K+, Na+/Ca2+, and Na+/Mg2+ in leaf were lower in Vao-9 than in Baiyan 5. Clearly, oat plant has the mechanism of selective absorption and distribution of various cations in different organs in response to alkali stress.

Key words: Alkali stress, Oat, Cation iquilibrium

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