Application of partially indica-type paddy rice dominant dwarf mutant

Abstract

The invention discloses an application of a partially indica-type paddy rice dominant dwarf mutant and belongs to the technical field of crop breeding. In the invention, natural mutation of genome of paddy rice, namely, a dominant dwarf mutant plant, is employed to obtain a stable and pure dominant dwarf mutant material through pollen tissue cultivation, thereby providing a dwarf source for breeding two-line or three-line hybridized paddy rice varieties. The selected dominant dwarf mutant can significantly reduce plant height of paddy rice, can improve anti-lodging performance and stable yield, and increases possibility of selecting an inter-subspecific hybridization variety and further provides substance conditions of increasing yield of the paddy rice and converting farming modes. With the stable and pure dominant dwarf material, a system being capable of randomly grouping and selecting the dwarf hybridization paddy rice varieties is established, by which the lodging problem, which often occurs during production, is solved. Meanwhile, the dominant dwarf mutant is suitable for a simplified cultivation mode in production of hybridized seeds and in large field, and can reduce labor intensity and production cost.

Description

technical field [0001] The invention belongs to the technical field of rice breeding, and in particular relates to the application of a dominant dwarf mutant of indica type rice. Background technique [0002] Plant height is an important agronomic trait related to yield. According to the plant height at the mature stage of rice, rice is usually divided into three types: tall stalk, semi-dwarf and dwarf. It is not only beneficial to lodging resistance, but also resistant to barrenness, which is beneficial to increase yield. The dwarf breeding started in the late 1950s reduced the plant height of rice to semi-dwarf, and the yield per unit area of ​​rice achieved the first leap, which became one of the symbolic achievements of the "green revolution". The ongoing breeding of super rice mainly utilizes the ideal plant type and heterosis between indica and japonica subspecies in order to further increase the yield of rice. [0003] At present, most of the indica rice breeding us...

AI Technical Summary

Problems solved by technology

Repeated use of the same gene will result in a narrow genetic basis for bred varieties and increased genetic vulnerability

Moreover, the dwarf genes used in rice breeding are all recessive genes. The use of recessive dwarf genes in hybrid rice breeding often requires that both parents must have the same dwarf gene, which limits the selection of favorable parents in a wider range of resources.

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