ISHS Acta Horticulturae 402: International Symposium on Cultivar Improvement of Horticultural Crops. Part 1: Vegetable Crops
PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERS OF THE ALC, NOR AND RIN PIPENING MUTANTS IN TOMATO AND APPLICATION IN BREEDING FOR STORAGE PROPERTY |
| Authors: | L. Chungui, X. Helin, Y. Rongchang, Y. Wengui |
| Abstract:
A major difficulty in the handling of fresh market tomatoes is that the easily get soft and then perishable the ripe fruits. Ceponis reported that the spoilage amount of tomato fruit after harvest is about 20% of total yield every year. This problem has led to the harvest of mature-green fruit, which is ethylene-treated and then rapidly markted. This practice can lead to inferior quality. People hoped breeding up a new variety with long shelf life and superior quality in fruits. A number of single-gene ripening mutants of tomato have been studied in the ripening process, such as Nr (never ripe), rin (ripening inhibitor), and nor (non ripening). In fruits from mutant plants, no respiratory or ethylene climacteric was observed, and firmness declined very slowly with only trace levels of polygalacturonase present in mature fruit. They express very long shelf-life, but associate with decreased fruit quality. 'Alcobaca', another ripening mutant, was first described by Almeida (1961) as a material with long storage life, but quality of the Alcobaca fruits was similar to normal. In the final stage (or the fruits remain on the plants) the fruit color becomes red or light red. 'Alcobaca', is promising material in breeding. The purpose of this study was to characterize these mutants and heterozygote (nor/+, alc/+, rin/+) further in order to choose the method of utilizing the fruit ripening mutants gene in practical breeding program. In addition, breeding process and expression of 'Changling' tomato, a hybrid with long-shelf life, high resistance and high yield, were elaborted. | |
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