Fan Yuan, Ren Chang-Zhong, Li Pin-Fang, Ren Tu-Sheng
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
Ying Yong Sheng Tai Xue Bao. 2011 Nov;22(11):2875-82.
This paper monitored the oat growth and cation absorption characteristics on a saline-alkali soil in the Baicheng region of Jilin Province under low, medium, and high levels of salt stress. No significant differences were observed in the shoot growth and yield components under the three levels of salt stress, but the root biomass and root/shoot ratio decreased significantly with increasing salt stress level. At maturing stage, the root/shoot ratio under medium and high salt stresses was 77.2% and 64.5% of that under low salt stress, respectively. Under the three levels of salt stress, the K+/Na+ and Ca2+/Na+ ratios in oat plant had significant differences at trefoil stage, but no significant differences at heading stage. With the increase of salt stress level, the cation absorption selectivity coefficient of oat at filling stage decreased significantly, but the transportation selectivity coefficient had no significant difference under the three levels of stress. It was concluded that oat could adapt to the salt and alkali stress of soda-alkaline soil to some extent, and the adaptation capability decreased with the increasing level of stress. The decrease of oat root biomass and the stronger ion selective absorption capacity at heading stage under salt and alkali stress could benefit the shoot growth and yield components of oat.
本文监测了吉林省白城市盐碱地在低、中、高盐胁迫水平下燕麦的生长及阳离子吸收特性。在三个盐胁迫水平下，地上部生长和产量构成未观察到显著差异，但根生物量和根冠比随盐胁迫水平的增加而显著降低。在成熟期，中度和高度盐胁迫下的根冠比分别为低盐胁迫下的77.2%和64.5%。在三个盐胁迫水平下，燕麦植株在三叶期的K+/Na+和Ca2+/Na+比值存在显著差异，但在抽穗期无显著差异。随着盐胁迫水平的增加，灌浆期燕麦的阳离子吸收选择性系数显著降低，但转运选择性系数在三个胁迫水平下无显著差异。研究得出结论，燕麦在一定程度上能够适应苏打盐碱土的盐碱胁迫，且适应能力随胁迫水平的增加而降低。盐碱胁迫下燕麦根生物量的降低以及抽穗期较强的离子选择性吸收能力有利于燕麦地上部生长和产量构成。
