Photosynthetic Response of Peanut 1

Autor: Y. B. Samish, J. E. Pallas
Rok vydání: 1974
Předmět:
Zdroj: Crop Science. 14:478-482
ISSN: 1435-0653
0011-183X
DOI: 10.2135/cropsci1974.0011183x001400030042x
Popis: The net photosynthetic rates of nine genotypes of the cultivated peanut (Arachis hypogaea L.) grown under controlled conditions were measured at six different light intensities: 180, 255, 526, 784, 1098, and 1546 µE m−2 sec−1 (E = einsteins). All genotypes evidenced an endogenous, circadian rhythm in photosynthetic rate. No genotype photosaturated at the highest intensity used, which was slightly less than full sunlight. Genotypes differed significantly in photosynthetic rate at similar light intensities; net photosynthetic rates of several of the genotypes exceeded 50 mg dm−2 hr−1. Soybean (Glycine max (L.) Merr., cv. ‘Bragg’) and tomato (Lycopersicum esculentum L., cv. ‘Marion’), grown similarly to peanut in growth chambers, showed considerably lower photosynthetic potential and photosaturated at much lower light levels (~250 to 500 µE m−2 sec−1). The peanut's photosynthetic response can help explain its adaptation to the dissimiliar light conditions in humid, semihumid, and arid regions. Its high rate of photosynthesis at any light level indicates that it is one of the more efficient species in converting solar energy to fixed carbon. Lowering ambient oxygen concentration to 1.5% increased net photosynthetic rate 35%. No correlation between specific leaf weight and net photosynthesis of the peanut was found.
Databáze: OpenAIRE
Externí odkaz: