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Title: Effect of heat stress on proline, chlorophyll content, heat shock proteins and antioxidant enzyme activity in sorghum (Sorghum bicolor) at seedlings stage
Authors: Gosavi, G U
Jadhav, A S
Kale, A A
Gadakh, S R
Pawar, B D
Chimote, V P
Keywords: Antioxidant enzymes;Chlorophyll;Heat stress;HSP;Proline;Sorghum
Issue Date: Jul-2014
Publisher: NISCAIR-CSIR, India
Abstract: The effect of heat stress on various biochemical and physiological parameters at seedling stage was investigated in drought tolerant, susceptible and wild sorghum [Sorghum bicolour (L.) Moench] genotypes. Under heat stress, susceptible genotypes showed higher reduction in total chlorophyll content than tolerant genotypes. Significant increase in proline accumulation and activities of d-1-pyrroline-5-carboxylate synthetase (P5CS), superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) enzymes were observed in stressed seedlings over control. Higher activities of antioxidant enzymes under stress condition might be useful for sorghum seedlings to cope up with oxidative damage by heat stress. Higher proline accumulation and antioxidant activities were observed in wild sorghum genotypes and could be used for gene mining for heat stress tolerance as well as in breeding programmes for transfer of heat stress tolerance trait. Many novel heat shock proteins (Hsps) were synthesized in drought tolerant genotypes (19), followed by wild genotypes (8) and drought susceptible genotypes (6). Thus, the above parameters studied would be useful as selection criteria in identifying heat stress tolerant donors in future sorghum breeding programmes. Pooled data from both RAPD and SSR analysis when subjected to clustering analysis revealed wide divergence in wild genotypes for stress resistant, while susceptible genotypes exhibited low divergence.
Page(s): 356-363
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.13(3) [July 2014]

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