Malate synthase activity in cotton and other ungerminated oilseeds. A survey

Extracts from several species and varieties of ungerminated cotton seeds plus homogenates from 18 other oilseeds (representing 11 different families) were examined for malate synthase and isocitrate lyase activity. Malate synthase activities in the various cotton seeds ranged from 35 to 129% of the...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1979-06, Vol.63 (6), p.1068-1071
Main Authors: Miernyk, J A, Trelease, R N, Choinski, J S
Format: Article
Language:English
Subjects:
Embryos
Enzymes
Germination
Glyoxylate cycle
Glyoxylates
Homogenization
Isocitrates
Oilseeds
Plants
Seeds
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Summary:Extracts from several species and varieties of ungerminated cotton seeds plus homogenates from 18 other oilseeds (representing 11 different families) were examined for malate synthase and isocitrate lyase activity. Malate synthase activities in the various cotton seeds ranged from 35 to 129% of the units per dry seed weight found in Deltapine 16 cotton. For other oilseeds, the range was from 0.3 to 58% of Deltapine 16 cotton. Castor bean (Ricinus communis L.) had the least activity per mg dry weight (12-fold lower than the next lowest species), while Pima cotton (Gossypium barbadense L.) had the highest level (8.53 units). On a per seed basis, these values were 15 and 747 nanomoles per minute. Malate synthase activity was measurable in all seed types examined, whereas isocitrate lyase could not be detected in any of the seeds. We suggest that synthesis of malate synthase during seed development is universal among oilseeds in the absence of glyoxylate-cycle-associated isocitrate lyase activity.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.63.6.1068