TITLE

Effects of drought and re-watering on endogenous hormone contents of cotton roots and leaves under drip irrigation with mulch

AUTHOR(S)
LUO Hong-hai; HAN Huan-yong; ZHANG Ya-li; ZHANG Wang-feng
PUB. DATE
April 2013
SOURCE
Yingyong Shengtai Xuebao;Apr2013, Vol. 24 Issue 4, p1009
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Under the climatic and ecological conditions of Xingjiang, Northwest China, different degrees of drought stress were installed during the growth stages of cotton, and the drip irrigation with mulch was adopted, aimed to study the effects of drought stress and re-watering on the endogenous hormones (abscisic acid, ABA; and zeatins, ZRs) contents of cotton roots and leaves and the stomatal conductance (gs) of cotton leaves. With the increase of drought stress at different growth stages, the ABA contents of cotton roots and leaves increased, while the ZRs contents of cotton roots and leaves and the gs and photosynthetic rate (Pn) of cotton leaves decreased, with greater decrements in the treatment of soil moisture content being 40% -45% of field capacity at early floweringfull flowering stage. After re-watering, the ABA contents of cotton roots and leaves did not have a decrease with the improvement of soil moisture regime, while the ZRs contents of cotton roots recovered rapidly or exceeded the control after 1-3 days of re-watering. There was a positive correlation between the ZRs contents of cotton roots and the gs of cotton leaves. In the treatment of soil moisture content being 50% -55% of field capacity at full budding-early flowering stage, the ZRs contents and gs of cotton leaves recovered more quickly and with greater increments. It was suggested that the higher ZRs contents of cotton roots after re-watering could be the main cause for the higher stomatal conductance and photosynthetic rate of cotton leaves.
ACCESSION #
91993985

 

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