Method for selecting and reproducing early-flowering late japonica rice sterile line Zhe japonica rice 4A with high stigma exposure rate

Abstract

The invention relates to a method for selecting a sterile line variety of late japonica rice (Dian I type), and particularly discloses a method for breeding and reproducing a high-quality early-flowering late japonica rice sterile line Zhe japonica rice 4A with a high stigma exposure rate. The breeding method comprises the following steps of hybridizing a BT type sterile line 7627A [with the preservation number of CN1793 in the national germplasm repository and ZF02-3033 (combined into Bing 97342 / / Bing8502 / Babawee) (with the preservation number of CGMCCNo.8016), performing back crossing and selfing by using the ZF02-3033 as a male parent, performing back crossing transfer in combination with combining ability determination and high-temperature resistant identification from the BC6F1 generation, and bagging and selfing BC15F1 with the maturing rate of zero to obtain the Zhe japonica rice 4A. The late japonica rice sterile line Zhe japonica rice 4A selected by the method can early flower, and is high in stigma exposure rte, outcrossing rate, stress tolerance and quality.

Description

technical field [0001] The invention relates to a breeding method for a late japonica rice (Dian I type) CMS variety, in particular to a breeding and propagation method for a high-quality late japonica rice CMS line Zhejing 4A with early flowering time and high stigma exposed rate. Background technique [0002] Rice is the most important food crop in my country, and rice production will directly affect food security and social stability. In the mid-1970s, the research on hybrid rice was successful, which greatly increased the rice production in my country. The important factor of whether an excellent hybrid rice combination can be popularized and applied in production is the seed production yield, and the seed production yield is closely related to the characteristics of the sterile line such as flowering time and stigma exposure rate. The three-line indica CMS lines currently used in production in my country generally have higher stigma exposure rate and earlier flowering ...

AI Technical Summary

Problems solved by technology

The three-line indica CMS lines currently used in production in my country generally have higher stigma exposure rate and earlier flowering time, and the seed production yield is higher; while the three-line japonica CMS lines generally have less stigma exposure, lower exposure rate, and flowering time. The time is also late, the outcrossing is poor, and the yield of seed production is low

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