Abstract:
:The rates of CO(2) exchange and (14)CO(2) incorporation in the light and dark and the activities of several photosynthetic, photorespiratory, and respiratory enzymes of soybean (Glycine max [L.] Merr. cv. Wye) reproductive structures were determined at weekly intervals from anthesis to pod maturity. At all stages of pod development soybean reproductive structures were found to be incapable of net photosynthesis under the experimental conditions employed, but capable of gross photosynthesis and light-induced (14)CO(2) uptake. Consistent with the lack of net photosynthesis throughout the development of the reproductive structure, the maximum in vitro activity of ribulose 1,5-bisphosphate carboxylase (EC 4.1.1.39) in pod tissue was only 3% of that in leaf extracts when expressed on a fresh weight basis. We concluded that the major role of the reproductive structure of the soybean with respect to photosynthetic carbon metabolism is the reassimilation of its respiratory CO(2).
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Quebedeaux B,Chollet Rdoi
10.1104/pp.55.4.745subject
Has Abstractpub_date
1975-04-01 00:00:00pages
745-8issue
4eissn
0032-0889issn
1532-2548journal_volume
55pub_type
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