Heat-resisting japonica rice breeding method

Abstract

The invention discloses a heat-resisting japonica rice breeding method. The heat-resisting japonica rice breeding method includes: using a high-temperature-resisting farm japonica-glutinous variety as a male parent or a female parent and a variety with good comprehensive agronomic characters in a japonica rice planted area as a female parent or a male parent, subjecting the two varieties to artificial emasculation and hybridization, and performing generation-adding planting of a first filial generation in Hainan; planting a second filial generation in a breeding base under high temperature stress, meeting the requirement that a heading and filling stage matches with an extremely high temperature period, performing simple amylose measurement by indigo dyeing, eliminating seeds dyed in brownish red, subjecting corresponding embryo-carried rice grains dyed in blue to non-resistance germination on a paper bed, and performing third generation-adding planting in Hainan; performing the detect-screening twice for a fourth generation and a sixth generation, and performing generation-adding planting of a fifth generation and a seventh generation in Hainan; and after genetic characters of an eighth generation basically stabilize, performing measurement of quality, resistance and comprehensive agronomic characters to obtain a heat-resisting japonica rice variety or strain. By the aid of the heat-resisting japonica rice breeding method, multiple cross with japonica rice materials in the prior art is avoided, and the breeding cycle is shortened by more than one time.

Description

technical field [0001] The invention relates to a heat-resistant japonica rice breeding method. Background technique [0002] Indica and Japonica are two subspecies of cultivated rice. Indica rice has good heat resistance, but poor cold resistance, and is suitable for planting in southern rice areas with high temperature in my country; area planted. The poor heat tolerance of japonica rice is mainly manifested in the heading poplar and grain filling stage. Under high temperature conditions, the leaves are prematurely senescent, the seed is low, the grain filling is not full, the yield is not high, and the quality is poor. Japonica rice has strong fertilizer tolerance, lodging resistance, and is not easy to shatter. It is suitable for mechanized and intensive production, and has a great potential for increasing yield. It has good quality, especially the high rate of processed whole rice, and is suitable for large-scale and commercial production. "Indica to Japonica" is a ne...

AI Technical Summary

Problems solved by technology

Heat tolerance is a comprehensive agronomic trait controlled by multiple genes, which can theoretically be solved by transgenic technology, but the basic work of related gene positioning, cloning and multi-gene transduction is still very weak, and it is still difficult to solve this problem by transgenic technology

Theoretically, heat-tolerant japonica varieties can also be bred by using indica rice with heat-tolerant ability for conventional hybridization. However, due to the poor hybrid compatibility between indica and japonica subspecies, the offspring will be poor, which will cover up the success of the heat-tolerant offspring. performance, it is difficult to simultaneously select for leaf premature senescence, fruiting and filling degree, and the reliability is poor; and it needs repeated backcrossing with japonica rice to breed real japonica rice varieties, and its efficiency is low