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Genetika  2004 

Senescence of rin, rin/rin, rin/+ and +/+ tomato fruits

DOI: 10.2298/gensr0403195z

Keywords: tomato , fruit maturing and senescence , uniform maturing , effects of ETEPHONE

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Abstract:

Ripening inhibitor (rin) gene is a spontaneous recessive mutant which changes fruit ripening aspects (most important synthesis of carotene, especially lycopene). It also delays fruit senescence. Tomato is a vegetable crop with specific maturing climax (pik). Tomato genotypes homozygote for rin gene does not have this maturing climax, so the ethyl-ene production and red, lycopene colour does not appear. In order to research the maturing process material from the final tomato selection cycle we used: pure line S-49 (genetic constitution u/u, with uniform ripening), line hom 4 (rin/rin, homozygote with ripening inhibitor) and hybrid combination 449 Fl (u/rin, heterozygote for ripening inhibitor). Fruits with uniform ripening and hybrids ripened simultaneously, while homozygote with rin gene did not ripe at all. Ethylene stimulates the appearance of yellow colour in rin fruits and the lycopene production. After treatment with ETEPHONE (0.1%) (Ethylene) fruits with uniform ripening, senescence more quickly, while hybrids senescence slowly. Rin homozygotes did not change colors, but the fruits senescence more quickly comparing to control. Ethylene treatment speeded the maturing and senescence process in tomato fruits. Extended maturing process as a result influence of rin gene, makes the new created hybrids a late maturing ones. On the other hand, the firmness of fruits is improved as well as the "shelf life", which enables longer transportation and storing, coordinated maturing according to market demands. The aim was to research the maturing according to market demands. The aim was to research the maturing process of rin heteroyzgote, and the reaction of some genotypes to treatment with RT-REL (Ethzlene) in order to decrease extremely late maturing.

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