Photosynthetica, 2008 (vol. 46), issue 2

Photosynthetica 2008, 46(2):315 | DOI: 10.1007/s11099-008-0058-0

Response of senescing rice leaves to flooding stress

S. K. Mishra1,*, L. Patro1, P. K. Mohapatra1, B. Biswal1
1 Biochemistry Laboratory, School of Life Sciences, Sambalpur University, Jyoti Vihar, Orissa, India

Flooding stress (FS) induced changes in pigment and protein contents and in photochemical efficiency of thylakoid membranes of chloroplasts were investigated during senescence of primary leaves of rice seedlings. Leaf senescence was accompanied by loss in 2,6-dichlorophenolindophenol (DCPIP) photoreduction, rate of oxygen evolution, quantum yield of photosystem 2 with an increase in MDA accumulation, and non-photochemical quenching (NPQ) of chlorophyll fluorescence. These changes were further aggravated when the leaves during this period experienced FS. The increase in NPQ value under stress may indicate photosynthetic adaptation to FS.

Keywords: adaptation to stress; carotenoids; chlorophyll; non-photochemical quenching; photosystem 2; quantum yield; senescence

Received: August 20, 2007; Accepted: December 17, 2007; Published: June 1, 2008Show citation

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Mishra, S.K., Patro, L., Mohapatra, P.K., & Biswal, B. (2008). Response of senescing rice leaves to flooding stress. Photosynthetica, 46(2), 315. doi: 10.1007/s11099-008-0058-0.
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