LEVEL OF ENDOGENOUS INDOLE-3-ACETIC-ACID IN THE STEM OF PINUS-SYLVESTRIS IN RELATION TO THE SEASONAL-VARIATION OF CAMBIAL ACTIVITY

被引:56
作者
SUNDBERG, B
LITTLE, CHA
CUI, K
SANDBERG, G
机构
[1] FORESTRY CANADA,MARITIMES REG,FREDERICTON E3B 5P7,NB,CANADA
[2] BEIJING UNIV,DEPT BIOL,BEIJING,PEOPLES R CHINA
关键词
CAMBIAL ACTIVITY; INDOLE-3-ACETIC ACID; SCOTS PINE (PINUS-SYLVESTRIS L);
D O I
10.1111/j.1365-3040.1991.tb01342.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Gas chromatography - selected ion monitoring - mass spectrometry was used to measure the level of indole-3-acetic acid (IAA) in the cambial region at the top and bottom of the branchless portion of the main stem of three large Scots pine trees, at weekly intervals from 28 April to 13 July. During this period, the cambium reactivated from the dormant state and entered its 'grand' period of xylem and phloem production, which was monitored by microscopy. The total amount of IAA (ng cm-2) increased steadily from 28 April until late June, and thereafter remained constant. In contrast, the concentration of IAA (ng g-1 fresh weight) was high at the start of cambial reactivation, declined when the number of differentiating tracheids began to increase, and then rose as the number of cells decreased. The timing and magnitude of the changes in xylem and phloem production and in IAA level were similar at the two sampling positions. It is concluded that the seasonal changes in cambial activity in the conifer stem cannot be ascribed simply to a fluctuation in the level of endogenous IAA in the cambial region.
引用
收藏
页码:241 / 246
页数:6
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