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Method for producing hybrid seeds for hybrid middle-season combined paddy rice and method for breeding same

A rice seed and rice technology, which is applied to the seed production method and breeding field of hybrid medium indica rice, can solve problems such as poor rice quality, and achieve the effects of increasing grain weight per ear, ideal plant shape, and strong lodging resistance.

Inactive Publication Date: 2018-02-02
浙江科诚种业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although hybrid rice mainly solves the problem of high yield, the problem of poor rice quality is common

Method used

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  • Method for producing hybrid seeds for hybrid middle-season combined paddy rice and method for breeding same
  • Method for producing hybrid seeds for hybrid middle-season combined paddy rice and method for breeding same
  • Method for producing hybrid seeds for hybrid middle-season combined paddy rice and method for breeding same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Selection of male and female parents and their traits

[0042] The photothermosensitive male sterile line Y58S was selected as the female parent;

[0043] The restorer rice R8199 obtained by crossing Yangdao 6 with R213 was selected as the male parent.

[0044] Female parent traits: This variety is an indica-type dual-purpose GMMS line. The initial sowing period is 97-76 days. The average plant height is 80-90 cm. The plant type is moderately tight. Yellow, white stigma, long, straight, narrow, concave, thick leaves, 15-12 leaves on the main stem; 8-10 effective panicles per plant, about 26 cm in length, average spikelets per panicle The number of flowers is 150, the average thousand-grain weight is 25 grams; the sterile plant rate is 100%, the sterility degree is 100%, the pollen is completely aborted, mainly attenuation, and the starting point temperature of sterility is lower than 23 ℃; the total exposed rate of stigma is 88.9%. Bilateral exposure rate was 59.6%. ...

Embodiment 2

[0065] The difference from Embodiment 1 is that in the step (4) of the selection process, the male parents of the first period and the male parents of the second period are mixed and planted randomly.

Embodiment 3

[0067] The difference from Embodiment 1 is that in the step (4) of the selection process, the male parent of the first period and the male parent of the second period are planted at intervals.

[0068] Seed Characteristics of Hybrid Medium Indica Combination Rice

[0069] main agronomic traits

[0070] The plant height is placed between the male parent and the female parent, the tillering ability is stronger than the male parent and the female parent, the plant shape is more compact than the male parent and the female parent, the flag leaves are rolled upright, the leaf color is lighter than the male parent and the female parent, and the panicle is larger. Many, medium grain density, colorless glumes, occasional short awns, good late color change, moderate grain shattering, strong lodging resistance; the average number of effective ears per mu is 148,000 ears, and the average plant height is 128.5 cm. The average ear length is 27.3 cm, the average total number of grains per e...

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Abstract

The invention discloses a method for producing hybrid seeds for hybrid middle-season combined paddy rice and a method for breeding the same. The technical scheme mainly includes that the method for breeding the hybrid seeds includes steps of selecting photo-temperature-sensitive sterile lines Y58S to be used as female parents and using restorer-line paddy rice R8199 as male parents; raising rice seedlings by two sections, carrying out pollination, then cutting off the male parents, harvesting the female parents, then drying and thoroughly winnowing the female parents and strictly preventing mechanical mixing to obtain the seeds for the hybrid middle-season combined paddy rice. The restorer-line paddy rice R8199 is selectively bred after NO.6 Yangdao and R213 are hybridized. The methods have the advantages that combinations are perfect in plant type, high in tillering ability, lodging resistance, setting rate and yield, stable in yield and good in rice quality, green stems become yellowand ripe in later periods, steamed rice has good taste, the seeds are suitable to be cultivated as single-season middle-season paddy rice in paddy rice fields in the middle and lower reaches of the Yangzi River, and the like.

Description

technical field [0001] The invention relates to rice seed production, in particular to a seed production method and breeding method of hybrid medium-indica combination rice. Background technique [0002] Rice is the main food crop in my country, and the planting area of ​​hybrid rice accounts for more than half of the rice planting area in my country. Two-line hybrid rice breeding is an original high-tech technology in my country that focuses on the utilization of photothermo-sensitive sterility. It is another major technological innovation in rice genetics and breeding after the three-line hybrid rice. Compared with the three-line hybrid rice, the two-line hybrid rice has significant advantages: first, the male sterile line and the restorer line can be combined freely, and the probability of breeding an excellent combination is increased; second, the male sterile line is dual-purpose , can be used for seed production under long-day high-temperature conditions (summer), and...

Claims

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Application Information

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IPC IPC(8): A01H1/02
Inventor 刘化宙
Owner 浙江科诚种业股份有限公司
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