Morphological and physiological characterization of different genotypes of faba bean under heat stress

Journal Article
Siddiqui, Manzer H. . 2015
Publication Work Type: 
ورقة علمية
بحث , علمي , منشور
Magazine \ Newspaper: 
Saudi Journal of Biological Sciences
Volume Number: 
22, 656–663
Publication Abstract: 

Heat stress (HS) is the major constraint to crop productivity worldwide. The objective of
the present experiment was to select the tolerant and sensitive genotype(s) on the basis of morphophysiological
and biochemical characteristics of ten Vicia faba genotypes. These genotypes were as
follows: Zafar 1, Zafar 2, Shebam 1, Makamora, Espan, Giza Blanka, Giza 3, C4, C5 and G853.
The experimental work was undertaken to study the effects of different levels of temperature (control,
mild, and modest) on plant height (PH) plant1, fresh weight (FW) and dry weight (DW)
plant1, area leaf1, content of leaf relative water (RWC), proline content (Pro) and total chlorophyll
(Total Chl), electrolyte leakage (EL), malondialdehyde level (MDA), hydrogen peroxide (H2O2), and
activities of catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) enzymes. HS significantly
affected growth performance of all genotypes. However, the magnitude of reduction in genotypes
‘C5’ was relatively low, possibly due to its better antioxidant activities (CAT, POD and SOD),
and accumulation of Pro and Total Chl, and leaf RWC. In the study, ‘C5’ was noted to be the most
HS tolerant and ‘Espan’ most HS sensitive genotypes. It was concluded that the heat-tolerant genotypes
may have better osmotic adjustment and protection from free radicals by increasing the accumulation
of Pro content with increased activities of antioxidant enzyme.
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