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Mechanicalized seedling method of hybrid rice

A hybrid rice technology, applied in the fields of botanical equipment and methods, applications, and plant genetic improvement, can solve problems such as differences in grain shape and grain weight, and the accuracy cannot reach the purity of hybrid seeds. Improve pollination and seed setting, achieve scale and intensification effects

Inactive Publication Date: 2004-12-22
CHONGQING CITY SEEDS
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since there are obvious differences in grain type and grain weight between the main panicle and the tiller panicle, and between different parts of the same panicle, the accuracy of mechanical sorting often cannot reach the required purity of hybrid seeds. So far this technology has not been applied in production practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment one, realize the mechanization of seed production with Heiying marker three-line sterile line (female parent)

[0009] 1. Use Heiying 1 to cross the maintainer line K17B, select a Heiying individual plant with better comprehensive traits in its F2 generation and then cross it with II-32B, and then select a growth period close to the restorer line and comprehensive traits in its F2 generation A better Heiying single plant was used as the maintainer line and Zhenyou 97A was backcrossed. After 6 backcrosses, the CMS line and the maintainer line were basically the same type and stable. Heiying with a growth period similar to that of Huangying Chenghui 047 (male parent) was selected. CMS A.

[0010] 2. Mix 45Kg Heiying CMS A and 7.5Kg Huangyingchenghui 047 per hectare, and then use plastic seedling trays for sowing and seedling management according to the operating procedures for cultivating and throwing seedlings.

[0011] 3. When the seedling grows to about 3 l...

Embodiment 2

[0016] Embodiment two, realize the mechanization of seed production by marking the three-line restorer line (male parent) with Heiying

[0017] 1. Cross Heiying 1 with Mianhui 725, select Heiying individual plants with better comprehensive traits in the F5 generation, and observe the testcross with the existing main male sterile lines, and select the yellow II-32A with the growth period and yellow The similar black restorer R.

[0018] 2. Mix 40Kg of yellow II-32A and 7.5Kg of black restorer R per hectare, and then use plastic seedling trays for sowing and seedling management according to the operating procedures for cultivating and throwing seedlings.

[0019] 3. When the seedling grows to about 3 leaves, throw it into the seeding field evenly. The method of fertilization requires heavy topdressing and early topdressing, and the late topdressing of nitrogen fertilizer is prohibited, so that the length of the flag leaf of the sterile line is controlled at about 20 cm when hea...

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Abstract

The present invention belongs to hybrid rice breeding and is one kind of mechanical hybrid breeding technology. Rice varieties with near growing stage and different shell colors are used as male and female parents, and the breeding process includes mechanical mixed seeding and seedling growing, mixed pollination, mixed harvesting, seed separation with color selecting and other breeding links, hybrid rice is bred. The present invention can ensure seed quality, lowering breeding cost, reducing labor strength and realize large scale and intensive hybrid rice breeding.

Description

1. Technical field [0001] The invention belongs to agricultural breeding, in particular to a hybrid rice seed production method. 2. Background technology [0002] At present, the seed production of hybrid rice (hereinafter referred to as seed production), from sowing to harvesting, still relies entirely on manual operations, that is, the sowing and seedling raising of male and female parents (collectively referred to as parents), transplanting, pollination and harvesting. The purity of the harvested hybrid rice seeds must be above 96% by manual operation. This manual operation with high labor intensity and low production efficiency has resulted in high production costs of hybrid rice seeds, seriously affecting the promotion of hybrid rice to all parts of the world, especially to developed countries. The best way to reduce the cost of hybrid rice seed production is to change the manual operation of the seed production process to mechanization. In the prior art, there is a C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01H1/02
Inventor 李贤勇王楚桃李顺武何永歆
Owner CHONGQING CITY SEEDS
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