Different drought-stress responses in photosynthesis and reactive oxygen metabolism between autotetraploid and diploid rice

• DOI: 10.1007/s11099-014-0020-2
• Publication Date: 2014-03-18T01:23:31Z
• Authors: P. M. Yang; Q. C. Huang; G. Y. Qin; S. P. Zhao; J. G. Zhou
• Keywords: Phosphoenolpyruvate carboxylase; Photoinhibition; Plant Physiology; Photosynthetic efficiency

Photosynthetic light curve, chlorophyll (Chl) content, Chl fluorescence parameters, malondialdehyde (MDA) phosphoenolpyruvate carboxylase (PEPC) activity and reactive oxygen metabolism were studied under drought stress in two autotetraploid rice lines corresponding diploid lines. Net photosynthetic rate decreased dramatically, especially severe high active radiation rice, while it declined less the same conditions Compared with lines, maximum photochemical efficiency of photosystem (PS) II, actual PSII reduced PEPC activities higher could alleviate inhibition photosynthesis caused by stress. The chromosome-doubling enhanced photoinhibition tolerance lower MDA content superoxide anion production was found indicating low peroxidation level cell membranes. At time, dismutase (SOD), peroxidase (POD), catalase (CAT) SOD, POD, CAT effectively diminish species membrane lipid peroxidation.