油菜素内酯促进小麦幼苗生长及其生理基础的研究

THE PROMOTION OF BRASSINOLIDE ON THE GROWTH OF WHEAT SEEDLINGS AND ITS BIOLOGICAL MECHANISM

Soaking of wheat seeds in brassinolide (BR) increased the number of roots andpromoted the elongation of root and plumular sheath and the accumulation of seedlingaerial part and root dry matler. But this treatment had very little effect on the heightof seedlings. BR soaking of seeds or spraying of seedlings enhanced the formation oftillers in field. The sensitivity of organs to BR was found to be: root>sheath>leaf,and optimum concentration of BR-treatments was 10~(-2) ppm. The promotion of BR on the growth of wheat seedlings was mainly correlatedwith the enhancement of nitrogen-metabolism (promoting the synthesis of solubleprotein), and had no relevance to the content of chlorophyll, soluble sugar or free-proline in seedling leaves.