A kind of three-cross breeding method of cucumber rootstock

Abstract

The invention discloses a three-way cross hybrid breeding method of a cucumber root stock. The method comprises the following steps: 1, breeding parent seeds, wherein a parent A is screened from cucumber root stock hybrids in a selfing manner, and a uniparental propagation selfing line is fixed by a single plant which is low-temperature resistant and strong in growth; the parent B is screened from F1 hybrids of the cucumber root stock in a selfing purification manner; the uniparental propagation selfing line is fixed by a single plant which is full in seed and strong in seedling stage; the parent C is screened from F1 hybrids of the cucumber root stock in a selfing purification manner; the uniparental propagation selfing line is fixed by a single plant which is medium in growth and good in grafting compatibility; 2, preparing a single cross hybrid by taking the parent A as a female parent and the parent B as a male parent; and 3, preparing the three-way cross hybrid by taking the single cross hybrid obtained in the step 2 as a female parent and the parent C as a male parent. The cucumber root stock bred by the method is good in grafting compatibility, tidy in germination, low-temperature resistant, strong in growth, and high in hybrid seed yield, and can resist more than two root diseases, and the parents has the low possibility of loss. Therefore, the defects of the existing variety are overcome.

Description

technical field [0001] The invention relates to a crop breeding method, in particular to a three-cross breeding method for cucumber rootstocks. Background technique [0002] Cucumber cultivation in my country has been grafted with Yunnan black-seeded pumpkin since the early 1990s. Black-seeded pumpkin is a conventional variety with good grafting affinity and high resistance to fusarium wilt and soil-borne diseases. Aggravated, the ability to resist Phytophthora root rot is poor, and the type of resistance to soil-borne diseases is relatively simple. The C.Moschata type pumpkin rootstock introduced has the advantage that the commerciality of the grafted melon strips is greatly improved, and it can remove the wax powder on the surface of the cucumber melon strips. Pumpkin resources that can remove wax powder on the surface of cucumber rootstocks are extremely scarce, so they are still widely used by farmers. [0003] With the popularization of "oily" cucumber rootstocks and t...

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Problems solved by technology

[0003] With the popularization of "oily" type cucumber rootstocks and the intensification and large-scale planting of cucumber facilities, the shortcomings of rootstocks such as poor grain plumpness and irregular seedling emergence have become increasingly prominent , affect the industrialized seedling cultivation of cucumber facility cultivation. At the same time, due to years of planting and use, the original varieties have poor disease resistance and serious dead trees. The market urgently needs new varieties to be replaced, but the existing cucumber rootstocks have the following problems :

[0004] 1. Cucumber rootstock has poor grain plumpness and irregular seedling emergence

[0005]2. The problem of lack of "youliang" pumpkin germplasm resources

[0006] 3. Poor disease resistance of cucumber rootstocks

However, it is difficult to directly solve the breeding work of excellent cucumber rootstocks by using this method.

[0008]As an ideal new cucumber rootstock variety for overwintering cucumber cultivation in northern my country, it needs to have good grafting affinity, neat emergence, resistance to more than two kinds of root diseases, low temperature resistance, and good growth Strong, high seed production yield, but the existing breeding varieties can not be achieved

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