Heat-stress induced inhibition in growth and chlorosis in mungbean (Phaseolus aureus Roxb.) is partly mitigated by ascorbic acid application and is related to reduction in oxidative stress

• Autorzy: Kumar S. , Kaur R. , Kaur N. , Kaur N. , Bhandhari K. , Kaushal N. , Gupta K. , Bains T. S. , Nayyar H.
• Języki publikacji: EN

Abstrakty

EN

The rising temperatures (>35°C) are proving detrimental to summer-sown mungbean genotypes that experience inhibition of vegetative and reproductive growth. In the present study, the mungbean plants growing hydroponically at varying temperatures of 30/20°C (control), 35/25, 40/30, and 45/35°C (as day/night 12 h/12 h) with (50 µM) or without ascorbic acid (ASC) were investigated for effects on growth, membrane damage, chlorophyll loss, leaf water status, components of oxidative stress, and antioxidants. The ASC-treated plants showed significant improvement in germination and seedling growth especially at 40/30 and 45/35°C. The damage to membranes, loss of water, decrease in cellular respiration, and chlorophyll were significantly prevented by ASC treatment to plants growing at these temperatures. The oxidative stress measured as malondialdehyde and hydrogen peroxide content was observed to be significantly lower at high temperatures with ASC application. The activities of superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase increased at 40/30°C but decreased at 45/35°C in the absence of ASC while with its application, the activities of these enzymes were appreciably resorted. Among all the antioxidants, the endogenous ASC content decreased to the greatest extent at 45/35°C grown plants indicating its vital role in affecting the response of mungbean to heat stress. Exogenously applied ASC raised its endogenous content along with that of glutathione and proline at 45/35°C. The findings indicated that heat stress-induced inhibition in growth and chlorosis was associated with decrease in leaf water status and elevation of oxidative stress, which could partly be prevented by exogenous application of ASC. Its role in imparting protection against heat stress is discussed.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2011
• Tom: 33
• Numer: 6
• Opis fizyczny: p.2091-2101,fig.,ref.

Twórcy

autor

Kumar S.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Kaur R.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Kaur N.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Kaur N.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Bhandhari K.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Kaushal N.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Gupta K.

• Department of Botany, Panjab University, Chandigarh 160 014, India

autor

Bains T. S.

• Department of Plant Breeding, P.A.U., Ludhiana 141001, India

autor

Nayyar H.

• Department of Botany, Panjab University, Chandigarh 160 014, India

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