基于根系特征分析海岛棉幼苗耐碱性

针对海岛棉幼苗期进行耐碱性研究,设置不同Na₂CO₃胁迫浓度(0.00%、0.07%、0.09%和0.11%),待幼苗长至第11天根据其根部特征筛选海岛棉耐Na₂CO₃的最适浓度,并基于最适浓度评价海岛棉的耐受性。结果表明,0.09%的Na₂CO₃胁迫最适于鉴定海岛棉耐碱性;在0.09%的Na₂CO₃碱胁迫下,海岛棉品种根系特征性状均受到不同程度抑制,像素面积变异最弱。主成分分析将根部特征性状分为3个主成分,第1主成分为根系生物量和形态因子;第2主成分为侧根因子;第3主成分为主根长度因子。隶属函数值和D值之间拟合性较好,呈显著相关,因此可将两者统一进行综合评价,将海岛棉划分为敏感型、弱耐碱型、耐碱型和强抗型4类,并筛选到敏感材料4401和S(L),强抗材料JZ-1;供试海岛棉材料主要以中间型为主,极端材料较少。

Analysis of alkali tolerance of Sea|island cotton seedlings based on root characteristics

In this study, the alkali resistance of Sea|island cotton was studied at the seedling stage of Sea|island cotton. Different Na₂CO₃ stress gradients of 0.00%, 0.07%, 0.09% and 0.11% were set. The optimal gradient of Na₂CO₃ was used to evaluate the tolerance of Sea|island cotton. The results showed that 0.09% Na₂CO₃ stress was the most suitable for identifying alkali resistance of Sea|island cotton. Under 0.09% Na₂CO₃ alkali stress, the root characteristics of Sea|island cotton varieties were inhibited to varying degrees, and the pixel area variation was weak. The traits were divided into 3 components: the first principal component was root biomass and morphological factor; the second principal component was lateral root factor; the third principal component was principal root length factor. The fitting between the membership function value and the D value was good and significant. Therefore, a comprehensive evaluation of the two could be carried out. The alkali resistance of Sea|island cotton was divided into four categories: sensitive, weak alkali resistance, alkali resistance, and strong resistance. The sensitive materials 4401 and S(L) and strong resistance materials JZ-1 were selected. Sea|island cotton materials were mainly intermediate and less extreme materials.