Antioxidant defense system,lipid peroxidation,proline-metabolizing enzymes,and biochemical activities in two <Emphasis Type="Italic">Morus alba</Emphasis> genotypes subjected to NaCl stress |
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Authors: | P Ahmad C A Jaleel S Sharma |
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Institution: | 1.Biochemistry Laboratory, CRDT,Indian Institute of Technology Delhi,Hauz Khas, New Delhi,India;2.Stress Physiology Lab, Department of Botany,Annamalai University,Annamalainagar,India;3.Department of Botany, Baramulla College,University of Kashmir,Srinagar,India |
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Abstract: | Salt stress-induced changes in antioxidant enzymes, lipid peroxidation, proline and glycine betaine contents, and proline-metabolizing
enzymes were examined in the leaves of two mulberry cultivars (Local and Sujanpuri). With increasing salinity up to 150 mM
NaCl, superoxide dismutase, catalase, ascor-bate peroxidase, guaiacol peroxidase, glutathione reductase, and monodehydroascorbate
reductase activities were increased in both cultivars as compared to control, but more pronounced increase was observed in
cv. Local. Salt stress enhanced the rate of lipid peroxidation (as indicated by increasing MDA content) in both cultivars.
Under NaCl stress, cv. Local showed less change in the MDA content than cv. Sujanpuri. Salt stress resulted in a significant
accumulation of free proline in mulberry leaves, and more accumulation was detected in cv. Local than cv. Sujanpuri. The leaves
of cv. Local showed 9-fold accumulation of glycine betaine in comparision with cv. Sujanpuri after 20 days at 150 mM NaCl.
A decrease in proline oxidase activity and an increase in γ-glutamyl kinase activity were observed with increasing NaClconcentration.
The relative water content and electrolyte leakage also decreased after increasing the NaCl concentration, but a decrease
was more pronounced in cv. Sujanpuri than in cv. Local. The results indicate that oxidative stress may play an important role
in salt-stressed mulberry plants and cv. Local have more efficient antioxidant characteristics, which could provide for a
better protection against oxidative stress. |
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