The tomato Never-ripe locus regulates ethylene-inducible gene expression and is linked to a homolog of the Arabidopsis ETR1 gene.

AUTOR(ES)

Yen, H C

RESUMO

Fruit ripening represents a complex system of genetic and hormonal regulation of eukaryotic development unique to plants. We are using tomato ripening mutants as tools to elucidate genetic components of ripening regulation and have recently demonstrated that the Never-ripe (Nr) mutant is insensitive to the plant growth regulator ethylene (M.B. Lanahan, H.-C. Yen, J.J. Giovannoni, H.J. Klee [1994] Plant Cell 6:521-530). We report here ethylene sensitivity over a range of concentrations in normal and Nr tomato seedlings and show that the Nr mutant retains residual sensitivity to as little as 1 part per million of ethylene. Analysis of ripening-related gene expression in normal and mutant ethylene-treated fruit demonstrates that Nr exerts its influence on development at least in part at the level of ethylene-inducible gene expression. We have additionally used cloned tomato and Arabidopsis sequences known to influence ethylene perception as restriction fragment length polymorphism probes, and have identified a tomato locus linked to Nr that hybridizes to the Arabidopsis ETR1 gene at low stringency, suggesting the possibility that Nr may be homologous to ETR1.

Documentos Relacionados

• Ethylene Insensitivity Conferred by the Green-ripe and Never-ripe 2 Ripening Mutants of Tomato1
• Antisense Inhibition of the Nr Gene Restores Normal Ripening to the Tomato Never-ripe Mutant, Consistent with the Ethylene Receptor- Inhibition Model1
• Effect of Ethylene Pathway Mutations upon Expression of the Ethylene Receptor ETR1 from Arabidopsis1
• Ethylene-inducible DNA binding proteins that interact with an ethylene-responsive element.
• Histidine kinase activity of the ETR1 ethylene receptor from Arabidopsis