Tetraploid Watermelons Producing Small Fruits

Abstract

Tetraploid watermelon inbreds are disclosed. The invention relates to the seeds and plants of the tetraploid watermelon inbreds, the methods of propagating the tetraploid inbreds through seeds and tissue culture. The invention also relates to methods of producing the triploid seedless watermelon seeds and plants by crossing the tetraploid inbreds with diploid watermelon inbreds, and to the triploid plants produced therefrom.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. application Ser. No. 10 / 145,980, filed May 14, 2002. The aforementioned application is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]This invention is in the field of watermelon breeding, specifically relating to a tetraploid watermelon used to produce triploid seeds and plants for production of a substantially small sized seedless watermelon fruit.BACKGROUND OF THE INVENTION[0003]Watermelon is an important horticultural crop that accounts for 2% of the world area devoted to vegetable crops. There were 6,024,000 acres of watermelon grown in the world and 187,000 acres of watermelons grown in the United States in 1997. Asia is by far the most important watermelon production site with 72% of the world area and 77% of the world production (FAO Production Yearbook 51, 1998). The estimated annual world watermelon value exceeded $7.6 billion when using the United ...

AI Technical Summary

Benefits of technology

[0007]Accordingly, the present invention provides new and unique tetraploid watermelons. The tetraploid watermelons of the present invention are preferably tetraploid inbred lines and are particularly suitable as parent for triploid hybrids watermelons. The tetraploid watermelons of the present invention produce small fruits with a very thin rind. The fruits of the tetraploid watermelons of the present invention have preferably a high content of soluble solids. Importantly, the tetraploid watermelons of the present invention are capable of transmitting these desirable characterictics to their triploid progeny when crossed with diploid watermelons. Therefore, the present invention also discloses triploid watermelons that produce small-sized fruits virtually free of seeds and having a very thin rind. Such seedless watermelon fruits have the advantage of having more edible flesh with excellent taste and texture when compared to watermelons of comparable size, and are therefore particularly attractive to the consumer.

[0008]In a preferred embodiment, a tetraploid watermelon of the present invention produces a fruit weighting about 1.5 kg to about 2.5 kg, preferably about 2 kg. In another preferred embodiment, the rind of the fruit of a tetraploid watermelon of the present invention is about 4 mm to about 10 mm thick, preferably about 4 mm to about 7 mm thick. In another preferred embodiment, a tetraploid watermelon of the present invention has excellent fruit set. In another preferred embodiment, a tetraploid watermelon of the present invention has high sugar content. In another preferred embodiment, a tetraploid watermelon plant according to the present invention produces seeds weighting about 20 g to about 35 g per 1000 seeds, preferably about 23 g to about 33 g per 1000 seeds, preferably about 31 g per 1000 seeds, in another preferred emdodiment about 25 g per 1000 seeds. In another preferred embodiment, a tetraploid watermelon plant according to the present invention produces up to about 150 seeds per fruit, preferably about 70 to about 150 seeds per fruit. In another preferred embodiment, said plant produces about 34 fruits per plant. In another preferred embodiment, the fruit of said plant comprises about 12 to about 14% of soluble solids, preferably about 13%. In another preferred embodiment, the fruit of said plant matures about 24 to about 27 days after flowering.

[0016]g) the seed yield is significantly better than most of the tetraploids created with the same technique.

Problems solved by technology

However, when the size of the fruit is reduced, the proportion of the rind in the fruit increases, leaving only little space for the edible flesh.