ISSN:
1573-5079
Keywords:
Glycine max
;
light adaptation
;
RuBP Case activation
;
soybean leaf
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The initial (in vivo) and total (activity present after preincubation with CO2 and Mg2+) activities of ribulose bisphosphate carboxylase were both assayed in extracts of leaves of soybean (Glycine max) plants which had been grown under 4 different irradiance levels. The total carboxylase activity per unit leaf area decreased with decreased irradiance during growth but was not different on a dry weight basis. The initial activity as a percentage of the total activity was unchanged (approximately 95%) except in leaves of plants grown at the lowest irradiance (74%). When the plants grown at the lowest irradiance were exposed to high irradiance, the initial activity was increased to 93% of the total. Light saturated rates of photosynthesis per unit leaf area were lower and saturated at lower irradiance for plants grown at lower irradiances. Initial carboxylase activity was correlated closely (r2=0.84) with leaf photosynthesis rate on a dry weight basis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00030026
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