Effects of rhizosphere oxygen concentration on root physiological characteristics and anatomical structure at the tillering stage of rice

文献类型： 外文期刊

第一作者： Xu, Chunmei

作者： Xu, Chunmei;Chen, Liping;Chen, Song;Chu, Guang;Wang, Danying;Zhang, Xiufu

作者机构：

关键词： rice (Oryza sativa L; ); rhizosphere oxygen concentration; root morphology; root physiology; root tip ultrastructure

期刊名称：ANNALS OF APPLIED BIOLOGY （ 影响因子：2.75； 五年影响因子：2.942 ）

ISSN： 0003-4746

年卷期：

页码：

收录情况： SCI

摘要： Oxygen is essential for all aerobic organisms. Higher plants need oxygen to sustain metabolism and growth. After experiencing anaerobic stress for a period of time, most plant tissues will be damaged. This study examined the physiological characteristics and anatomical structures in the root tips of rice seedlings (cultivars Xiushui09 and Chunyou84) in response to different rhizosphere oxygen environments. The results showed that moderate oxygen (MO: 2.5-3.5 mg L-1) increased the dry weight accumulation and formation of rice roots (including length, surface area, number of tips) in both genotypes. Compared to under normal conditions (NC), the magnitudes of increase in these four variables were 4.67, 66.40, 35.44 and 49.50% in Xiushui09 and 12.25, 15.59, 13.57 and 13.48% in Chunyou84, respectively. Low oxygen (LO: 0-1.0 mg L-1) stress decreased the root surface area but increased root volume and average diameter. LO and high oxygen (HO: >6.8 +/- 0.21 mg L-1) stress each damaged the apical cells' ultrastructure, reduced the number of organelles, and increased electrical conductivity. Meanwhile, the root activity and respiration of rice seedlings decreased; the abscisic acid content increased compared to levels under NC. Under MO treatment, the cell membrane was not damaged, the root tip organelles were rich, the soluble protein content, root activity, respiration rate and gibberellic acid content increased compared to levels under NC; the magnitudes of these increases were 24.76, 36.00, 8.00 and 283.00% in Xiushui09 and 4.78, 40.00, 15.45 and 49.35% in Chunyou84, respectively. In conclusion, MO optimised rice root morphology and enhanced root physiological activity.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序