| Autor: |
Yu, Kai, Ju, Feiyan, Wang, Zhuo, Sun, Liyuan, Huo, Yuyang, Zhu, Junjun, Pang, Jiali, Ali, Saif, Chen, Weiping, Wang, Shanshan, Zhou, Zhiguo, Tang, Qiuxiang, Chen, Binglin |
| Předmět: |
|
| Zdroj: |
Physiologia Plantarum; Jan/Feb2023, Vol. 175 Issue 1, p1-15, 15p |
| Abstrakt: |
Potassium (K) application can alleviate cotton salt stress, but the regulatory mechanisms affecting cotton fiber elongation and ion homeostasis are still unclear. A two‐year field experiment was conducted to explore the effects of K on the osmolyte contents (soluble sugar, K+ content, and malate) and related enzyme activities during the fiber elongation of two cotton cultivars with contrasting salt sensitivity (CCRI‐79; salt tolerant cultivar, and Simian 3; salt‐sensitive cultivar). Three K application treatments (0, 150, and 300 kg K2O ha−1) were applied at three soil salinity levels (low salinity, EC = 1.73 ± 0.05 dS m−1; medium salinity, EC = 6.32 ± 0.10 dS m−1; high salinity, EC = 10.84 ± 0.24 dS m−1). K application improved fiber length and alleviated salt stress by increasing the maximum velocity of fiber elongation (Vmax). The increase rate of K on fiber length decreased with elevating salt stress, and the increase rate of K on Vmax of CCRI‐79 was greater than that of Simian3. K application can increase the enzyme activities (phosphoenolpyruvate carboxylase, PEPC, E.C. 4.1.1.31; pyrophosphatase, PPase, E.C. 3.6.1.1; and plasma membrane H+‐ATPase, PM H+‐ATPase, E.C. 3.6.3.14) as well as the content of osmolytes associated with the enzymes mentioned above. K increased the osmolyte contents under salt stress, and the increase in the K+ content of the fibers was much higher than that of soluble sugar and malate. The results of this study indicated K fertilizer application rates regulate the metabolism of osmolytes in cotton fiber development under salt stress, K+ is more critical to fiber elongation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Plný text