Characteristics of transgenic tomatoes antisensed for the ethylene receptor genes LeETR1 [corrected] and LeETR2 [corrected].

Two stable transformed lines containing antisense LeETR1 [corrected] or LeETR2 [corrected] sequences and their hybridized line were investigated to determine the effect of LeETR1 [corrected] and LeETR2 [corrected] specificity in the ethylene receptor family in tomato (Lycopersicon esculentum Mill.) on ethylene signaling. The transgenic line ale1 containing antisense LeETR1 [corrected] displayed shorter length of seedling grown in the dark and adult plant in the light, severe epinastic petiole, and accelerated abscission of petiole explant and senescence of flower explant, compared with its wild type B1.

Characteristics of fruit ripening in tomato mutant epi.

The characteristics of fruit ripening and expression of ripening-related genes were investigated in epi, an ethylene overproduction mutant of tomato (Lycopersicon esculentum Mill.). The epi produces apparently more ethylene than its wild type VFN8 at every stage of vegetative and fruit growth and ripening; compared to VFN8, the epi fruit showed higher CO2 evolution, faster descending of chlorophyll, slightly quicker increase of carotenoid and lycopene, and faster reduction in pericarp firmness during maturation and ripening; and the mRNAs of three ripening-related genes including E8, pTOM5 and pTOM6 were at higher levels in epi.

Effect of 1-methylcyclopropene post-harvest treatment on ripening process in cherry tomato fruit (Lycopersicon esculentum var. cerasiforme).

The responses of cherry tomato (Lycopersicon esculentum var. cerasiforme) fruits to post-harvest treatment with 1-MCP were investigated. The maturity stage at which 1-MCP application is most effective in delaying the ripening process was determined, and then the effects of different concentrations (0, 0.

[Research progress of ethylene signal transduction in plants].

During the past decade, molecular genetic studies on the model plant Arabidopsis have established a largely linear signal transduction pathway for the response to ethylene gas. Ethylene response occurs by receptors binding ethylene and signaling along a linear signal transduction pathway comprising of MAPK and transcriptional cascades. Ethylene receptor family in Arabidopsis consists of five components, ETR1, ERS1, ETR2, ERS2 and EIN4.

[Phenotype analysis of ethylene response in tomato Epinastics mutant].

The characteristics in seedling development, vegetative growth and fruit ripening of Epinastics (Epi) mutant overproducing ethylene and its wild type VFN8 tomato (Lycopersicon esculentum Mill.) were systematically investigated. Epi overproduced ethylene during vegetative growth and fruit development.