Abstract:
:The succulent leaf of the obligate Crassulacean acid metabolism plant Crassula falcata comprises two distinct types of parenchyma. The peripheral tissue is dark green, whereas the central tissue is relatively colorless. We have investigated whether the conventional interpretation of Crassulacean acid metabolism-simply, temporal separation of light and dark CO(2) fixation within individual cells-is sufficient. Ribulose-1,5-bisphosphate carboxylase/oxygenase (EC 4.1.1.39) and chlorophyll, indicating the photosynthetic-carbon-reduction pathway, were concentrated in peripheral tissue. Specific activities of P-enolpyruvate carboxylase (4.1.1.31) and of NAD(+)-malic enzyme (1.1.1.39), indicating capacity for dark CO(2) fixation and release, respectively, were high in both types of parenchyma. Measured directly as malic acid decline at the beginning of the photoperiod, CO(2) "storage" occurred in both tissues. These data indicate that there is a spatial component to Crassulacean acid metabolism in C. falcata.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Springer SA,Outlaw WHdoi
10.1104/pp.88.3.633subject
Has Abstractpub_date
1988-11-01 00:00:00pages
633-8issue
3eissn
0032-0889issn
1532-2548journal_volume
88pub_type
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