梭梭射线组织特征与非结构性碳水化合物含量的关系  

Relationship between Ray Tissue Features and Non-structural Carbohydrates in Xylem of Haloxylon ammodendron

作　　者：周朝彬 王梦瑶[2] 龚伟 ZHOU Chao-bin;WANG Meng-yao;GONG Wei(Sichuan Provincial Key Laboratory of Ecological Forestry Engineering,College of Forestry,Sichuan Agricultural University,Chengdu 611130,Sichuan,China;College of Agriculture,Shihezi University,Shihezi 832000,Xinjiang,China)

机构地区：[1]四川农业大学林学院生态林业工程省级重点实验室,四川成都611130 [2]石河子大学农学院,新疆石河子832000

出　　处：《干旱区研究》2018年第5期1105-1110,共6页Arid Zone Research

基　　金：国家自然科学基金项目(31500471)资助

摘　　要：目前,木质部射线组织与非结构性碳水化合物（NSC）含量之间的关系还存在不一致的结论。本文以古尔班通古特沙漠地区优势种梭梭（Haloxylon ammodendron）为供试材料,测定了3种生态类型梭梭木质部射线组织特征、NSC及其组分含量等。结果表明：砾石生态类型的梭梭木射线密度、射线比量、NSC及其组分含量最大,土质生态类型刚好相反。射线比量与NSC（P〈0.01）和淀粉含量（P〈0.05）呈显著正相关,射线细胞壁厚度与NSC含量呈显著负相关（P〈0.01）。这些结果表明,梭梭在较恶劣的条件下通过降低射线细胞壁厚度、增加射线比量和NSC来适应恶劣环境。There are currently the inconsistent conclusions about the relationship between ray tissue and nonstructural carbohydrate（ NSC） content in xylem. In this experiment,Haloxylona mmodendron,adominant species in the Gurbantunggut Desert,was taken as the test material,the ray tissue,NSC,soluble sugar and starch in ecotypes of gravel soil（ distributed in Jinghe）,sandy soil（ distributed in Shihezi） and loam（ distributed in Caijiahu）were determined,and the correlations between the ray anatomical features and NSC as well as its components were analyzed. The results showed that the ray proportion of H. ammodendron varied in a range of 3. 69%-7. 06%,and that of NSC was in a range of 3. 55%-5. 87% in the three ecotypes. The values were lower compared with those of tropical and subtropical tree species. This may be caused by the limited photosynthetic process of H. ammodendron due to the lack of soil nutrients,severe drought and salinity stress in desert environment. The precipitation in gravel soil was the lowest,which was characterized by the highest values of ray density,ray proportion,NSC and its components,and was in agreement with the lowest values of ray height and wall thickness of ray cell. However,the values of ray density,ray proportion,NSC and its components in loam were the lowest. The ray proportion was positively correlated with NSC（ P〈0. 01） and starch（ P〈0. 05）,but the wall thickness of ray cell was negatively correlated with NSC（ P〈0. 01） significantly. These results indicated that H. ammodendron improved the xylem nutrients,water storage and transportation efficiency to cope with the severe conditions by reducing the wall thickness of ray cell,increasing ray proportion and NSC. The results of this paper were of great significance to understanding the adaptation of the plant to the arid desert regions.

关 键 词：梭梭 射线比量 细胞壁厚度 淀粉 可溶性糖 非结构性碳水化合物(NSC) 古尔班通古特沙漠 

分 类 号：S792.99[农业科学—林木遗传育种]