Breeding method of temperate and tropical corn selfing line QB446

Abstract

The invention discloses a breeding method of temperate and tropical corn selfing line QB446. The breeding method includes: using the F1 generation hybridized by a tropical Suwan1(C11) colony materialand temperate Lancaster material representative line Mo17 as the base material, and using a natural selection method and a manual selection method to mutually improve the two materials and perform section. The method has the advantages that the advantages of the two materials are integrated, and the excellent selfing line which is good in resistance, high in seed output rate and good in quality; the breeding procedure is simple, easy in operation, high in success rate and low in manpower and material source consumption as compared with large colony selection; the QB446 bred by the method is high in combining ability, moderate in growth period, high in seed output rate, good in quality, high in disease resistance, fast in dewatering, many in ear rows, thick in ear, widely applicable and thelike.

Description

technical field [0001] The invention relates to the technical field of crop breeding, in particular to a breeding method for warm corn inbred line QB446. Background technique [0002] In the 1980s, the corn varieties planted in Guizhou and even Southwest China were basically local varieties with good disease resistance, but low yield and tall plants that were easy to fall. With the introduction of Yu 13, Nongda 60, and Yedan 13, etc., large and small leaf spot, Curvularia leaf spot, and rust were prevalent in large areas of corn production; since the 1990s, our team introduced Suwan1(C11), 3, No. 5 population germplasm, and then bred a batch of germplasm with high productivity per plant, resistance to leaf spot, denser leaves, and good quality. It has an effective inhibitory effect on corn leaf spot diseases, but the disadvantage is that the maturity period is late and the seed yield rate is low. [0003] Suwan germplasm, especially Suwan1 germplasm, has become an importan...

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Problems solved by technology

It has an effective inhibitory effect on corn leaf spot diseases, but the disadvantage is that the maturity period is late and the seed yield rate is low

[0003] Suwan germplasm, especially Suwan1 germplasm, has become an important germplasm for maize breeding in southwestern mountainous areas of my country. Suwan germplasm shows good comprehensive resistance (reverse), adaptability and barrenness tolerance in southern my country, and the appearance of grain is good. , high bulk density; but it also has the disadvantages of slow dehydration in the later stage, low seed yield, high grain water content and long growth period.

Lancaster germplasm is an important maize germplasm in the temperate region of my country. Its main feature is good economic traits, but in the south of my country, it shows poor comprehensive resistance and adaptability. Its representative line Mo17 has ear length, high seed yield, dehydration Fast, high combining ability, moderate growth period, etc.

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