Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/806924

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Title
Capping invertase activity by its inhibitor: roles and implications in sugar signaling, carbon allocation, senescence and evolution
Author/Creator
Ruan, Yong-Ling;  Jin, Ye;  Huang, Jirong
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences
Description
Since the initial biochemical study of a putative invertase inhibitor half a century ago, it has remained as a puzzle as whether such an inhibitory protein indeed limits invertase activity in vivo and, if it does, what is the developmental or physiological significance of such an interaction? Recently, we demonstrated that an invertase inhibitor, INVINH1, specifically inhibited cell wall invertase activity in tomato and Arabidopsis. Silencing INVINH1 expression in tomato released a significant amount of extra cell wall invertase activity. This posttranslational elevation of invertase activity resulted in a blockage of ABA-induced leaf senescence and an increase in fruit sugar levels and seed weight. Here, we discuss the implication of the findings and propose a model that the invertse inhibitor may act as a key modulator in controlling leaf longevity and seed development to ensure success during plant evolution. This may be achieved by optimizing carbon and nitrogen allocation and sugar signaling via interaction between invertase and inhibitor. The discoveries open up exciting new areas for exploring fundamental questions in sugar signaling, carbon allocation and plant development as well as avenues for improving crop productivity.
Relation
Plant Signaling and Behavior Vol. 4, Issue 10, p. 983-985
Publisher Link
http://dx.doi.org/10.4161/psb.4.10.9667
Date
2009
Publisher
Landes Bioscience
Keyword(s)
carbon allocation;  evolution;  invertase;  invertase inhibitor;  leaf senescence;  seed development;  sugar signaling
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/806924
Identifier
ISSN:1559-2316
Reviewed
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Subject
"Plant Signaling and Behavior"
 
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