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Light‐quality and irradiance effects on pigments, light‐harvesting proteins and Rubisco activity in a chlorophyll‐ and light‐ harvesting‐deficient soybean mutant
Author(s) -
Eskins Kenneth,
Jiang Cai Zhong,
Shibles Richard
Publication year - 1991
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1991.tb01280.x
Subject(s) - rubisco , far red , photosynthesis , blue light , mutant , pigment , biology , chlorophyll , photosystem ii , phytochrome , photosystem i , photosynthetic pigment , red light , botany , irradiance , biophysics , chemistry , biochemistry , gene , optics , physics , organic chemistry
Soybean ( Glycine max [L.] Merrill) plants, normal green (Clark L1) and mutant yellow (Clark y 9 y 9 ), were grown in (1) full‐spectrum solar irradiation; (2) either red plus far‐red or blue plus far‐red; (3) either red or blue light with no far‐red light. Young leaves harvested from first (1TF) trifoliolate or fifth (5TF) trifoliolate stages of development showed that the mutant plants express pigment and protein deficiencies as a direct function of irradiance. Response of the mutant to light quality indicates that blue light slightly enhances expression of the mutation at higher irradiances. Direct response of light‐harvesting proteins of photosystem 2 (LHCP2) and light‐harvesting protein of photosystem 1 (LHCP1) to light quality increases the ratio of LHCP1/LHCP2 in blue light compared to that in red or red/far‐red light. Rubisco proteins and Rubisco activity (leaf area basis) are directly related to irradiance level but are enhanced in blue light over equal irradiance red. This enhancement is not shown in the presence of far‐red light.