Elongation and gravireaction of intact and segmented roots: light effects
作者:
Roland Beffa,
Paul‐Emile Pilet,
期刊:
Physiologia Plantarum
(WILEY Available online 1982)
卷期:
Volume 54,
issue 1
页码: 1-6
ISSN:0031-9317
年代: 1982
DOI:10.1111/j.1399-3054.1982.tb00568.x
出版商: Blackwell Publishing Ltd
关键词: Root;maize;growth;gravireaction;light
数据来源: WILEY
摘要:
Using a macrophotographic technique, kinetic studies were performed on growth and gravireaction, both measured on maize (cv. LG 11) roots. When using intact roots, it was found that the growth rate decreased two hours after the beginning of the gravistimulus, the rate of root curvature being optimal at that time. These two processes are greater in light than in the dark. Subsequently, the curvature rate decreased rapidly to zero in the dark but, in light, it continued for at least a further three hours. There was then a recovery of elongation in darkness whereas in light growth rate remained low. A comparative analysis between root segments and intact roots suggests that the correlation between the growth and the gravireaction rates differs according to the system studied and that light has a greater effect on growth rate when the roots are subject to gravitational stimuli. Present data are discussed in terms of hormone balance between several endogenous regulators.
点击下载:
PDF
(6904KB)
返 回