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Effect of Low Light on Photosynthetic Pigments, Photochemical Efficiency and Hill Reaction in Rice ( Oryza sativa L.)
Author(s) -
Viji M. M.,
Thangaraj M.,
Jayapragasam M.
Publication year - 1997
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1997.tb00490.x
Subject(s) - oryza sativa , photosynthesis , shading , chlorophyll , pigment , photosynthetic pigment , cultivar , chlorophyll a , chemistry , horticulture , light energy , sunlight , agronomy , photochemistry , botany , biology , art , biochemistry , physics , organic chemistry , astronomy , gene , optics , visual arts
Photosynthesis and related functions in low light tolerant (CO 43 and Swarnaprabha) and low light susceptible (IR 20) rice varieties were measured under shaded conditions and in normal sunlight. The increase in the contents of chlorophyll (chi) a, chi b, total chlorophyll and caro‐tenoids under low hght treatment was more prominent i n Swarnaprabha and CO 43 than that of IR 20. But a decreasing trend was observed in chi ah ratio in all the three cultivars due to predominant increase of chi h fraction. The decrease in ratio was less in Swarnaprabha and CO 43 than that of IR 20, Higher photochemical efficiency and photosynthetic rate over IR 20 were maintained by Swarnaprabha and CO 43 grown under shaded condition. Shading up to flowering stage enhanced the Hill reaction and during harvest stage induced a reduction in Hill reactivity in all the three varieties.