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Published on August 18, 2006; 10.1104/pp.106.080135

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Received March 8, 2006
Accepted August 10, 2006

Suppression of LX Ribonuclease in Tomato Results in a Delay of Leaf Senescence and Abscission

Amnon Lers *, Lilian Sonego , Pamela J. Green , and Shaul Burd

Department of Postharvest Science of Fresh Produce, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Delaware Biotechnology Institute, University of Delaware, Newark, DE 19711 USA

* Corresponding author; email: alers{at}volcani.agri.gov.il.

Although present in different organisms and conserved in their protein sequence the biological functions of T2 ribonucleases (RNase) are generally unknown. The tomato (Lycopersicon esculentum) LX is a T2/S-like RNase and its expression is known to be associated with phosphate starvation, ethylene responses, and senescence and programmed cell death. In this study LX function was investigated using antisense tomato plants in which the LX protein level was reduced. LX protein levels normally become elevated when leaves senesce, and antisense inhibition of LX retarded the progression of senescence. Moreover, we observed a marked delay of leaf abscission in the LX- deficient plants. This correlated with specific induction of LX protein in tomato mature abscission zone (AZ) tissue. LX RNase gene regulation and the consequences of antisense inhibition indicate that LX has an important functional role in both abscission and senescence.




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