南京林业大学学报（自然科学版）2024，Vol.48Issue(2)：113-120,8.DOI:10.12302/j.issn.1000-2006.202207014
4个杜鹃品种对碱胁迫的耐受性分析
Alkali stress tolerance analysis of four Rhododendron cultivars
摘要
Abstract
[Objective]This study aims to analyze the tolerance differences of Rhododendron cultivars to alkali stress and effects on accumulation and distribution of mineral elements in different organs of rhododendron,and investigate the response mechanism of rhododendron to alkali stress.The results of this study provide a theoretical basis for breeding alkali-tolerant varieties.[Method]Alkaline salt solution Na2CO3-NaHCO3(volumn fraction 1∶9)was used to adjust the pH value of deionized water to 7.52 and 9.14,respectively.Four Rhododendron cultivars(Rhododendron'Zihe',R.'Kirin',R.'Yanzhi Mi'and R.'Fenxiu')were treated with pot watering of alkaline solution for two months,and the growth of plants,as well as physiological and biochemical indexes such as chlorophyll content,root vigor,ferric reductase activity and mineral content were measured.[Result]The different varieties of Rhododendron were significantly different in terms of their tolerance to alkali stress.Those plants with weak resistance showed symptoms of alkali damage,such as the yellowing of leaves or leaves drying and falling off,root blackening and even death.With an increase in alkaline stress,the high increment and dry matter ratio of the different varieties decreased significantly.The analysis of plant dry matter quality showed that the dry matter quality of the underground part of R.'Kirin'and R.'Yanzhi Mi'decreased significantly with the increasing degree of alkali stress;R.'Zihe'significantly decreased under high alkali stress,and R.'Fenxiu'had no significant difference among different treatments.The chlorophyll content and root activity of rhododendron decreased significantly,and root iron reductase activity increased.The root activity of R.'Zihe'and R.'Fenxiu'showed no significantly difference under different alkali intensities,while the root activity of R.'Kirin'and R.'Yanzhi Mi'significantly decreased compared with the control.Only R.'Zihe'showed significantly higher root iron reductase activity than the control under high alkali stress,whereas the other three cultivars showed no significantly difference among different treatments.An increase in alkali stress affected the accumulation and distribution of different mineral elements in the rhododendron.Na and Fe ions content significantly accumulated in the root system,whereas K+and Ca2+were concentrated in the leaves,and the content decreased significantly.The content of Na+in the leaves varied among cultivars.After alkali stress treatment,the content of Na+in leaves of R.'Yanzhi Mi'and R.'Kirin'increased significantly,but there was no significant change in R.'Zihe'and R.'Fenxiu.'[Conclusion]Based on the above indexes,R.'Zihe'and R.'Fenxiu'had strong alkali resistance,followed by R.'Yanzhi Mi',and the alkali resistance of R.'Kirin'was weak.关键词
杜鹃品种/碱胁迫/矿质元素/耐碱性Key words
Rhododendron cultivar/alkali stress/mineral element/alkali tolerance分类
农业科技引用本文复制引用
龚睿,夏溪,张春英..4个杜鹃品种对碱胁迫的耐受性分析[J].南京林业大学学报（自然科学版）,2024,48(2):113-120,8.基金项目
上海市科学技术委员会项目(20392000700) （20392000700）
上海市农业科技创新项目(2023-02-08-00-12-F04606). （2023-02-08-00-12-F04606）
