Ionic relations and proline accumulation in shoots of two Chinese Iris germplasms during NaCl stress and subsequent relief

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• 作者：Biao Zhang (1)
  Pin-Fang Li (1) pinfangli@163.com
  Fen-Cheng Fan (2)
• 关键词：Iris lactea var. chinensis – Ionic relations – Proline accumulation – Adaptation to salinity
• 刊名：Plant Growth Regulation
• 出版年：2012
• 出版时间：September 2012
• 年：2012
• 卷：68
• 期：1
• 页码：49-56
• 全文大小：388.2 KB
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• 作者单位：1. Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193 China2. Beijing Oasis Technology Development Co., Ltd, Beijing, 100193 China
• ISSN：1573-5087

文摘

Adaptation to salinity in plant includes not only their response to stress, but also their ability to recover from it. Seeds of Chinese Iris (Iris lactea var. chinensis) collected randomly from an arid area in inland province of Xinjiang (Xj, E93°30′, N42°48′, 740 m), and a semi-arid coastal area in Beijing Municipality (Bj, N40°34′, E116°10′, 540 m) were studied. The objectives were to determine differences between germplasms in ionic relations or accumulation of proline in the shoots and establish how I. lactea adapts to salt stress and subsequent relief. Hydroponically-grown seedlings of the two germplasms were supplied with nutrient solutions containing 0.1 (control), 140 and 280 mM NaCl for 12 days, and supplied subsequently with a non-saline control solution for 12 days to relieve NaCl stress. Germplasm Xj had larger shoot mass and shoot/root ratio than Bj during stress and recovery periods. Salinity, even subsequent recovery, more adversely affected the water content in Bj than Xj. Under identical provision of treatments, the Xj maintained relatively higher K+/Na+ ratio and selectivity for transportation of K+ over Na+ than Bj. Additionally, we observed a slight proline accumulation in shoots of Bj, but its content was insufficient for lowering the solute potential. Germplasm Xj exhibits better adaptation to salinity and subsequent recovery. This is mainly due to its higher selectivity for transporting K+ over Na+. Proline accumulation did not play a key role the osmotic adjustment of the two I. lactea germplasms studied.