期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 165, 期 5, 页码 482-489出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2007.03.012
关键词
auxin; cryptochrome; growth; phytochrome; wavelength
We investigated the rote of auxin on stem elongation in pea (Pisum sativum L.) grown for 10d in continuous darkness or under low-irradiance blue, red, far red and white light. The third internode of treated seedlings was peeled and the tissues (epidermis and cortex+central cylinder) were separately analyzed for the concentration of free and conjugated indole-3-acetic acid (IAA). Under red, far red and white tight internode elongation was linearly related with the free IAA content of all internode tissues, suggesting that phytochrome-dependent inhibition of stem growth may be mediated by a decrease of free IAA levels in pea seedlings. The correlation between IAA and internode elongation, however, did not hold for blue light-grown seedlings. The hypothesis that the growth response under low-irradiance blue light might be correlated with the lack of phytochrome B signalling and changes in gibberellin metabolism is discussed in view of current knowledge on hormonal. control of stem growth. (c) 2007 Elsevier GmbH. All rights reserved.
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