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Changes in lipoxygenase isoforms during germination and early seedling growth of Pisum sativum L.

Published online by Cambridge University Press:  22 February 2007

Bing Mo  and
Karen L. Koster
Bing Mo
Affiliation:
Department of Biology, University of South Dakota, Vermillion, SD 57069, USA
Karen L. Koster*
Affiliation:
Department of Biology, University of South Dakota, Vermillion, SD 57069, USA
*
*Correspondence: Fax: +1-605-677-6557 Email: [email protected]
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Abstract

Investigations of physiological functions of seed lipoxygenase during germination and early seedling growth are complicated by the presence of multiple isoforms with different product specificity. The combination of isoelectric focusing, lipoxygenase in-gel activity staining and mass spectrometry showed that only two seed lipoxygenases, LOX-2 and LOX-3, were active at neutral pH in protein extracts from dry and germinating pea seeds (Pisum sativum L.), with LOX-3 more abundant than LOX-2. Each active seed LOX appeared at multiple pIs, probably resulting from post-translational modifications. The abundance of pea seed lipoxygenases was lower in embryonic shoots than in other parts of the axis. After radicle emergence, seed LOXs were degraded, as revealed by Western blotting using antibodies specific to pea seed LOXs. Two new vegetative isoforms, LOX-N3 and LOX-g, appeared in the shoot and gradually replaced the pea seed lipoxygenases as the principal contributors to LOX enzyme activity during early seedling growth. Activities of LOX-N3 and LOX-g were abundant in shoot tips, but not root tips, in pea seedlings. Thus, during germination, there is a shift of LOX activity from radicles to shoots that accompanies the transition from seed LOXs to vegetative LOXs. These results confirmed that identification of pea LOXs based solely on pI may be misleading; however, mass spectrometry enabled more accurate identification of these highly homologous proteins to be made.

Keywords

lipoxygenaseLOXPisum sativumprotein identificationseed germination
Type
Research Article
Information
Seed Science Research , Volume 16 , Issue 2 , June 2006 , pp. 97 - 106
Copyright
Copyright © Cambridge University Press 2006

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