根系与叶片盐处理对枇杷幼苗生长及体内矿质元素分布的影响

Effects of Salt Treatment on Growth and Compartmental Allocation of Mineral Elements in Eriobotrya japonica Seedlings

在温室培养条件下,分别用根系和叶片Na Cl胁迫对甜土植物枇杷(Eriobotrya japonica)的幼苗进行处理,研究两种盐胁迫方式对其生长、矿质元素(Ca2+、Mg2+、Na+、K+、Cl-)和灰分含量在植物体各器官和叶片不同部位的影响。结果表明:在叶片盐胁迫下枇杷幼苗的叶片病斑较多分布于叶尖、叶缘,在根系盐胁迫下则较多分布于叶片中心区;根系盐胁迫促进枇杷幼苗的灰分含量积累,叶片盐胁迫则影响不大;两种方式盐胁迫枇杷幼苗体内的Na+和Cl-含量都呈极显著的正相关性;两种方式盐胁迫对枇杷幼苗的5种矿质元素含量影响相差不大,但它们影响矿质元素在植物中的重新分布;叶片盐胁迫对枇杷幼苗体内的离子毒害比根系盐胁迫的大。

Glycophyte Eriobotryajaponica seedlings were treated by NaCl in greenhouse through leaf surface spray and root system absorption, respectively, after which the growth rate, the amount of mineral elements and ash content in all plant organs and the different parts of the leaf were measured and compared. The results showed that the lesions mainly distributed at the leaf tip and leaf edge of E. japonica seedling leaves under leaf salt stress, and the lesions mostly located at the center of leaves under root salt stress. The accumulation of ash content increased under salt stress in the root, but which did not increase significantly in leaf. There was significant positive correlation between contents of Na^＋ and CI after both salt stress pathways. The contents of mineral elements （Ca^2＋, Mg^2＋, Na^＋, K^＋ and CI） in the seedlings varied little after both salt stress pathways, but their redistribution of mineral elements in the seedlings happened to change. The ion toxicity on E. japonica seedling was more serious under salt stress on leaf than that in root.