Effects of drought stress and rewatering on the growth and physiological characteristics of Shanxi wild Poa pratensis seedlings

doi:10.11686/cyxb2015098

Abstract

Abstract: Research has been undertaken on the effects of drought and rewatering on the growth and physiological characteristics of 15 species wild Poa pratensis seedlings in Shanxi. Using pot tests, at the four-leaf stage the P. pratensis species were water-controlled for 21 days and then re-watered. Seedling survival rates, relative growth rates (RGR), relative water content (RWC), proline (Pro), and the activity of superoxide dismutase (SOD) and malondialdehyde (MDA) content were measured on the 21st day after water-controlling and the 7th day after rewatering. All indexes were evaluated with the subordination function method to obtain the membership value of each population. Results showed that seedling survival rates, RGR, RWC and SOD declined during the 21-day drought stress. However, Pro and MDA contents increased. After rewatering, all the indexes rehabilitated to some degree but did not recover to the same level as the control groups. Data analysis showed the tested P. pratensis species could be grouped into three kinds. Class Ⅱ were medium drought-resistant populations, including QinshuiⅡ, HunyuanⅠ, QinshuiⅠ, Wutai, HunyuanⅡ, Yingxian, Guangling and Lingqiu. Class Ⅲ showed weaker drought resistance, including the Yuanqu, Ningwu, Huozhou, Xinzhou, Wuzhai and Lingshi populations. The Tunliu population was categorized as class Ⅳ, which had no drought resistance. The membership value of the QinshuiⅡpopulation was the highest, and could be used as the key selection object in the future.

ZHU Hui-Sen, WANG Bao-Ping, DONG Xiao-Yan, DONG Kuan-Hu, LI Cun-Fu. Effects of drought stress and rewatering on the growth and physiological characteristics of Shanxi wild Poa pratensis seedlings[J]. Acta Prataculturae Sinica, 2015, 24(7): 79-88.

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