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- Title
Na<sub>2</sub>So<sub>4 </sub> 和 Na<sub>2</sub>Co<sub>3</sub> 胁迫下苦楝幼苗的 形态及光合生理特性.
- Authors
张远兰; 胡 鑫; 蔡金峰; 国 靖; 郁万文; 曹福亮; 汪贵斌
- Abstract
To explore the response mechanism of Melia azedarach to salt stress and to provide reference for the application of M. azedarach in saline and alkaline areas. One-year-old M. azedarach seedlings grown in pots were used as materials, and subjected to sodium sulphate or sodium carbonate of three concentrations (200, 400, 600 mmol L') for 40 d to study the growth, physiological and photosynthetic porumeten. The results were as follows: The growth of needling height, ground diameter and biomass howed downward trends with the increase of salt concentration under neutral or alkaline salt stress, and the decline was greater under alkaline salt stress, Salt stress increased the root to shoot ratio, On the 10th day, all photosynthetic parameters showed similar decline characteristics under neutral or alkaline salt stress, and the decrease extent under alkaline salt stress was significantly greater than those under neutral salt stress, With the increase of treatment time, the net photosynthetic rate and transpiration rate decreased significantly under neutral salt or alkaline salt. With the increase of salt concentration, the chlorophyll content showed a downward trend. Salt stress of 200 mmol L" had little effect on the chlorophyll content, but 400 and 600 mmol · L' salt stress had wignificant effect on the chlorophyll content. Under 600 mmol. L' alkaline salt stress, the relative conductivity and saturated water deficit of M. azedarach leaves were the highest, significantly higher than those of other treatments. At the same concentration, the relative conductivity and saturated water deficit under alkaline salt stress were significantly higher than those under neutral salt stress. It can be seen that M. azedarach has a certain salt-alkali tolerance, the effect of alkaline salt on the M. azedarach seedlings is greater than neutral salt.
- Subjects
SODIUM sulfate; SODIUM carbonate; PHOTOSYNTHETIC rates; SALT; BIOMASS; CHLOROPHYLL
- Publication
Guihaia, 2021, Vol 41, Issue 2, p195
- ISSN
1000-3142
- Publication type
Article
- DOI
10.11931/guihaiia.gxzw201910022