Method for rapidly breeding sweet-waxy double-recessiveness maize selfing line

Abstract

The invention discloses a method for rapidly breeding a sweet-waxy double-recessiveness maize selfing line. Self pollination or intraspecific free powder scattering is conducted on existing sweet-waxy maize varieties, seeds with the phenotype being sunken shrinking are selected from clusters obtained through selfing to be planted, and the stable sweet-waxy double-recessiveness maize selfing line is obtained after continuous selfing. According to the method, the sweet-waxy selfing line does not need to be bred by oneself, adopted materials are simple and easy to obtain, operation is easy and convenient, cost is low, and the breeding term is short. The invention further discloses the method for rapidly breeding the sweet-waxy double-recessiveness maize selfing line. Different sweet-waxy maize varieties are respectively planted according to different sweet genes, the interspecific crossing free powder scattering is conducted on varieties the same in sweet gene, the seeds with the phenotype being sunken shrinking are selected, and the stable sweet-waxy double-recessiveness maize selfing line is obtained after continuous selfing. According to the method, gene polymerization is facilitated, the excellent sweet-waxy double-recessiveness selfing line is easier to select, and a good foundation is laid for widening the maize germplasm resources.

Description

technical field [0001] The invention belongs to the field of corn genetics and breeding, in particular to a method for rapidly breeding sweet and waxy double recessive corn inbred lines. Background technique [0002] With the continuous development of the economy and the improvement of living standards, urban and rural residents have an increasing demand for fresh corn, and the quality requirements are also getting higher and higher. The current single sweet corn and waxy corn cannot meet the taste and flavor. the needs of the people. In recent years, my country's corn breeders have bred a batch of new fresh corn varieties with both sweet and waxy flavors—sweet waxy corn, which is more and more popular among consumers because of its sweetness and waxy taste. Breeding sweet and waxy maize with sweet and waxy double recessive genes has become the research direction of fresh corn breeding. [0003] The requirement for the selection of sweet-waxy corn varieties is that one par...

AI Technical Summary

Problems solved by technology

Using two generations of test crosses to identify sweet and waxy double recessive genotypes, the cycle is long, the process is complicated, and the efficiency is low; while the markers linked to the wx gene are used to identify sweet materials, although sweet materials can be identified in the sweet S1 family. The plants with the glutinous double recessive gene can eliminate the plants that do not contain the sweet and waxy double recessive gene in the early generation, shorten the breeding cycle, reduce the field workload and breeding land, but the process is cumbersome and expensive

In addition, it is necessary to have good sweet and waxy corn inbred lines in hand to carry out the breeding of sweet and waxy double recessive inbred lines. The threshold is relatively high, and the time required for sweet and waxy corn inbred lines , it takes a long time to breed a sweet and waxy double recessive inbred line

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