海岸植物滨麦(Leymus mollis)和肾叶打碗花(Calystegia soldanella)根叶碳水化合物含量与土壤Na^+含量的关系

Relationship of Carbohydrate Contents in Leaves and Roots of Two Coastal Plants,Leymus mollis and Calystegia soldanella,to Na^+ content in Soil

研究了烟台海岸优势植物滨麦(Leymus mollis)和肾叶打碗花(Calystegia soldanella)根、叶碳水化合物含量与土壤Na^+含量的关系,以揭示碳水化合物代谢在植物盐适应中的作用。结果表明:近高潮线处土壤Na^+含量最高,滨麦根、叶中Na^+、水分、可溶性糖和淀粉含量也较高。远离高潮线,土壤Na^+、水分含量下降,滨麦根、叶中Na^+、可溶性糖、淀粉含量下降,纤维素含量增加;根叶总碳水化合物中可溶性糖、淀粉含量比例降低,纤维素含量比例增高。远离高潮线,肾叶打碗花叶片中Na^+、可溶性糖含量稳定,淀粉含量上升,纤维素含量降低;根中Na^+含量上升、可溶性糖含量稳定、淀粉含量和纤维素含量降低;根叶总碳水化合物中淀粉比例增加,纤维素比例减少。在土壤Na^+浓度较高时,滨麦通过被动积累Na^+和积累非结构碳水化合物维护根、叶水分平衡,在土壤Na^+浓度降低及根叶Na^+含量减少时,将更多的非结构碳水化合物用于生长,部分转化为纤维素用于组织建成。积累Na^+提高吸水力和保水力、调整总碳水化合物中非结构和结构碳水化合物比例,可能是两盐生植物对异质Na^+环境适应的重要特征。

In order to learn what role of carbohydrates content play in the plant adapting to salt soil,the structural and non-structural carbohydrates content in the leaves and roots of Leymus mollis and Calystegia soldanella grown in different distances from the high tide line and Na＋content in the soil and plants were tested.The results showed that in closed to high tide line with higher Na＋content in the soil,there were higher Na＋and water contents,soluble sugar and starch contents in the leaves and roots of L.mollis.With increasing distance far from the high tide line and decreasing of Na＋content in the soil,there were decreasec in Na＋content,soluble sugar and starch,increase in cellulose content and ratio of cellulose to total carbohydrate in the leaves and roots of L mollis.While,with far away high tide line,there were stable content of Na＋,soluble sugar,increase in the starch content,decrease in the cellulose content in the leaves of C.soldanella.At same times,there were increase in the Na＋,stable soluble sugar,decrease in starch and cellulose contents in the roots of C.soldanella.It indicated that L.mollis negetively accumulated Na＋and increase non-structural carbohydrates to maintain water balance of leaves and roots when there was higher Na＋content in the soil,used more non-structural carbohydrates to its growth and conversion to cellulose to built plant tissue when reducing of Na＋content.L.mollis and C.soldanella grown in different distances from the high tide line would increase its ability of holding water and taking up water by accumulating Na＋in the roots and leaves,and regulate the ratio of non-strutural and structural carbohydrates to total carbohydrates,which would be an important characteristics for them to adapt to different Na＋soil environment.