Antioxidant Status in Salt Stress Cotton

D.R. Gossett, MC. Lucas, E.P. Millhollon, W.D. Caldwell, and Amy Barclay


 
ABSTRACT

Reported salt tolerant varieties (Acala 1517-88, Acala 1517-91, Acala 1517-SR2, and Acala 1517-SR3) and salt sensitive varieties (Deltapine 50 and Stonevile 825) of cotton were grown for 8 weeks at salt levels ranging from 0 to 200 mM NaCl. Analysis of the growth data indicated that either Deltapine 50 or Stoneville 825. Leaf samples from Acala 1517-88 and Deltapine 50 plants grown at 0 and 150 mM NaCl were analyzed for the antioxidant enzymes catalase, glutathione reductase, peroxidase, and superoxide dismutase (SOD). The salt induced level of the enzyme in Delta pine 50 suggests that both varieties have similar dismutating activities; however, the higher constitutive level of catalase and induced level of peroxidase in Acala 1517-88 indicate that the more salt tolerant variety may have a higher capacity for the decomposition of H2O2 generated by SOD. The increased glutathione reductase level observed in the salt stressed Acala 1517-88 may reflect an increased glutathione turnover rate, and suggests that the more salt tolerant variety may exhibit a more active glutathione-ascorbate cycle than the less tolerant Deltapine 50.



Reprinted from 1992 Proceedings Beltwide Cotton Conferences pp. 1036 - 1039
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified Sunday, Dec 6 1998