Effect of Different Levels of Potassium and Boron on Stress Physiology and Cell Wall Boron Content of Cotton Leaf

• Main Authors: WU Xiu-wen, HAO Yan-shu, LEI Jing, JIANG Cun-cang
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2016-01-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: cotton; potassium; boron; stress physiology; boron in the cell wall
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2016/1/20160105.htm
• ISSN: 2095-6819; 2095-6819

To find out the effect of potassium(K) and boron(B) on cotton leaf cell membrane and B distribution and utilization, the membrane relative permeability, MDA, Pro, the content of free B, semi-bound B and bound B and the content of B in cell wall of cotton leaf were analyzed under different K levels with solution culture method in this study. The results showed that in normal K(20 mgK·L-1), B deficiency(0 mgB·L-1) hindered the normal growth and dry mass of shoots, in addition, the membrane relative permeability, the content of MDA and Pro significantly increased compared with the normal B(0.2 mgB·L-1), and the relative concentration of bound B, R value, cell wall material and the ratio of total cell wall B/leaf B increased by 10.32%, 21.28%, 31.35% and 31.35%, respectively. In contrast, under low K(2 mgK·L-1) supply, B deficiency produced a very significant decrease in the relative concentration of bound B and the ratio of total cell wall B/leaf B. The above results showed that under either K-deficient or K-sufficient condition, B deficiency damaged the cotton leaf cell membrane and cell membrane permeability. In normal B-supplied plants, lacking of B induced more B into the cytoplasm, but increased the proportion of B that combined with the pectic polysaccharides in cell wall. However, under K-deficient treatment, the proportion of B cross-linked pectic polysaccharides in cell wall decreased.