skip to main content

Differential response of salt stress on Brassica juncea: Photosynthetic performance, pigment, proline, D1 and antioxidant enzymes

Mittal, Shweta ; Kumari, Nilima ; Sharma, Vinay

Plant Physiology et Biochemistry, May, 2012, Vol.54, p.17(10) [Periódico revisado por pares]

Texto completo disponível

Citações Citado por
  • Título:
    Differential response of salt stress on Brassica juncea: Photosynthetic performance, pigment, proline, D1 and antioxidant enzymes
  • Autor: Mittal, Shweta ; Kumari, Nilima ; Sharma, Vinay
  • Assuntos: Superoxides ; Carotenoids ; Enzymes ; Antioxidants (Nutrients) ; Proline ; Chlorophyll ; Salinity ; Enzymology ; Photosynthesis
  • É parte de: Plant Physiology et Biochemistry, May, 2012, Vol.54, p.17(10)
  • Descrição: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.plaphy.2012.02.003 Byline: Shweta Mittal, Nilima Kumari, Vinay Sharma Abbreviations: Car, carotenoids; Chl, chlorophyll; ETRmax, maximum electron transport rate; aF/Fm'sat, effective quantum yield of PSII at saturating PPFD; PPFDsat, saturating photosynthetically active photon flux density; PSII, photosystem II; Rubisco, ribulose-1, 5-bisphosphate carboxylase Abstract: To investigate the ability of sensitive and tolerant variety of Brassica juncea to adapt to a saline environment in a field, we examined the activities of antioxidant enzymes in relation to photosystem II, chlorophyll a fluorescence, photosynthetic pigment concentration, protein (D1) and proline in plants exposed to salt stress. We observed a greater decline in the photosynthetic rate (aF/Fm') and electron transport rate (ETRsat) and saturating photosynthetically active photo flux density (PPFDsat) under salt stress in var. Urvashi (sensitive variety) than in var. Bio902 (tolerant variety). Var. Urvashi was found to be more sensitive to high salinity. In var. Bio902, chlorophyll a, chlorophyll b and total chlorophyll concentrations were higher than in the sensitive variety. Proline and protein contents were also higher in var. Bio902 as compared to their lower accumulation in var. Urvashi. The improved performance of the var. Bio902 under high salinity was accompanied by an increase in ascorbate peroxidase (APX, EC 1.11.1.11) and catalase (CAT, EC 1.11.1.6), though no salt-dependent increase in the activity of superoxide dismutase (SOD, EC 1.15.1.1) was observed. However, no such increase in APX and CAT was observed in var. Urvashi, though there was significant increase in SOD activity. These results suggest that var. Bio902 is potentially more tolerant to salt damage and is associated with better adaptive responses found in var. Bio902 than var. Urvashi. Increased photoinhibition in var. Urvashi as observed by its reduced thylakoid membrane protein, D1 probably results from the greater photosynthetic damage caused by salt stress than var. Bio902. Author Affiliation: Department of Bioscience and Biotechnology, Banasthali University, Rajasthan-304022, India Article History: Received 13 October 2011; Accepted 1 February 2012
  • Idioma: English

Buscando em bases de dados remotas. Favor aguardar.