Abstract
An ascorbate-deficient semi-dwarf mutant asfL-1 was detected in 250 Gy γ-ray treated grass pea (Lathyrus sativus L.) cv. BioR-231. The mutant contained only 42 % of leaf and 20 % of root ascorbate content of mother control (MC). I investigated the possible causes of ascorbate deficiency and its effect on growth and antioxidant defense in control and 150 mM NaCl-treated seedling after 60 d growth period. Ascorbate deficiency was due to significant reduction in activities of monodehydroascorbate reductase and dehydroascorbate reductase as well as increase in ascorbate oxidase, leading to considerable decrease in redox state. Despite low ascorbate pool and decrease in ascorbate peroxidase activity, shoot and root biomass production in asfL-1 mutant were similar to MC plants, even at NaCl treatment. High accumulation of glutathione (GSH) coupled with high activities of GSH reductase, catalase, GSH peroxidase and peroxidase in both tissues of the mutant permitted efficient recycling of GSH and scavenging of H2O2 through well integrated catalase/peroxidase system, despite high superoxide dismutase activity under NaCl treatment. The collapse of this system led to inhibition of growth in NaCl-treated mother plants. Together, the results suggested that asfL-1 plants undertook a major reshuffle in its antioxidant defense machinery, which effectively counterbalanced the negative impact of ascorbate deficiency and remained unperturbed by NaCl treatment to maintain normal growth and biomass production.
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Abbreviations
- AO:
-
ascorbate oxidase
- APX:
-
ascorbate peroxidase
- ASC:
-
ascorbate, reduced form
- ASC-GSH cycle:
-
ascorbateglutathione cycle
- asfL-1 :
-
ascorbate deficient type-1 mutant in Lathyrus sativus
- BSO-L:
-
butathione-[S,R]-sulfoximine
- CAT:
-
catalase
- DHA:
-
dehydroascorbate
- DHAR:
-
dehydroascorbate reductase
- DTT:
-
dithiothreitol
- GPX:
-
glutathione peroxidase
- GR:
-
glutathione reductase
- GSH:
-
glutathione, reduced form
- GSSG:
-
glutathione, oxidized form
- MC:
-
control mother plant
- MDA:
-
malondialdehyde
- MDHA:
-
monodehydroascorbate
- MDHAR:
-
monodehydroascorbate reductase
- MT:
-
treated mother plant
- MuC, MuT:
-
mutant control and treated plants
- POX:
-
peroxidase
- ROS:
-
reactive oxygen species
- SOD:
-
superoxide dismutase
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Acknowledgements: Author thanks Dr. Z. Hossain for linguistic revision of the article.
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Talukdar, D. Ascorbate deficient semi-dwarf asfL1 mutant of Lathyrus sativus exhibits alterations in antioxidant defense. Biol Plant 56, 675–682 (2012). https://doi.org/10.1007/s10535-012-0245-5
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DOI: https://doi.org/10.1007/s10535-012-0245-5