Photosynthetica 2000, 38(2):267-273 | DOI: 10.1023/A:1007246314876
Differential Photosynthetic Acclimation Pattern to Limiting Growth-Irradiance in Two Types of C4 Plants
- 1 Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, India
- 2 Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, India
Photosynthetic acclimation to reduced growth irradiances (650 and 200 µmol m-2 s-1) in Eleusine coracana (L.) Garten, a nicotinamide adenine dinucleotide-malic enzyme (NAD-ME) C4 species and Gomphrena globosa L., a nicotinamide adenine dinucleotide phosphate-malic enzyme (NADP-ME) C4 species were investigated. E. coracana plants acclimated in 4 and 8 d to 650 and 200 µmol m-2 s-1, respectively, whereas G. globosa plants took 8 and 10 d, respectively, to acclimate to the same irradiances. The acclimation to reduced irradiance was achieved in both species by greater partitioning of chlorophyll towards the light-harvesting antennae at the expense of functional components. However, magnitude of increase in the light-harvesting antenna was higher in E. coracana as compared to G. globosa. Superior photosynthetic acclimation to reduced irradiance in G. globosa was due to the smaller change in functions of the cytochrome b 6/f complex, photosystem (PS) 1 and PS2 leading to the higher carbon fixation rates compared to E. coracana.
Additional key words: chlorophyll amount and fluorescence; cytochrome b6, f; electron transport rates; net photosynthetic rate; photosystems 1 and 2; quantum efficiency of photosystem 2
Prepublished online: November 1, 2000; Published: August 1, 2000 Show citation
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