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Effects of
water deficit stress on seed yield and antioxidants content
in soybean (Glycine max L.) cultivars
Hassan
Masoumi1*, Farrokh Darvish1, Jahanfar
Daneshian2, Ghorban Normohammadi1 and
Davood Habibi3
1Department
of Agronomy and Plant Breeding, Science and Research Branch,
Islamic Azad University, Iran.
2Department
of Oilseed crops, Seed and Plant Improvement Institute,
Iran.
3Faculty
of Agriculture and Natural Sciences, Karaj Branch, Islamic
Azad University, Karaj, Iran.
*Corresponding author. E-mail:
Masoumi_hassan118@yahoo.com.
Tel: +98 912 6078513. Fax: +98 21 88842112.
Accepted 26 October, 2010 |
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The
metabolic reasons associated with differential sensitivity
of soybean cultivars to water deficit stress are not well
understood. Therefore, field experiments were conducted in
2008 and 2009 to determine some agronomic traits and
activity of antioxidants under different levels of
irrigation. The experimental design was randomized complete
block in a split plot arrangement with four replications at
both years. Irrigation treatments were (S1, 50; S2, 100 and
S3, 150 mm evaporation from the Class "A pan" evaporation)
and cultivars were (L17, Clean, TMS, Williams*Chippewa and
M9). Results showed that, water deficit stress increased
antioxidants content [superoxide dismutase (SOD), catalase
(CAT), glutathione peroxidase (GPX)] significantly, but
content of them were more at mild than high water deficit
stress (S2>S3>S1). Furthermore, water deficit stress,
decreased total chlorophyll content, number of pods per
plant, thousand seed weight, seed yield and harvest index in
all of cultivars. Among cultivars, L17 and Williams*Chippewa
produced the highest seed yield at the optimum condition of
irrigation and both water deficit stress levels,
respectively. Assessment of correlation results indicated
that, there was a positive and significant correlation among
SOD and seed yield in both water deficit stress levels, too.
Key words: Soybean, water deficit, antioxidant
enzymes.
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