Method for increasing prodn. of hybridized rice

A hybrid rice, a potential technology, applied in the direction of botany equipment and methods, application, plant genetic improvement, etc.

Inactive Publication Date: 2005-05-25
HUNAN HYBRID RICE RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the application of wild rice high-yield QTL to improve the yield potential of hybrid rice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Example 1: The three-line hybrid rice restorer line Ce 64-7 was used as the recipient and recurrent parent to cross and backcross with wild rice high-yielding gene donor material. Genomic DNA was extracted from individual plants in each backcross generation, analyzed using closely linked molecular markers, tracking wild rice high-yield genes yld1.1 and yld2.1, and screening heterozygous genotype individual plants containing wild rice amplification bands , and then continuously backcross to BC with the recipient parent as the recurrent parent 3 f 1 . Then self-breed for multiple generations, and conduct field selection mainly based on agronomic traits, select excellent single plants and test-cross with three-line CMS lines such as V20A and Jin 23A, and test cross according to a large number of test-cross F 1 The yield performance of the restorer lines was selected again. Results from BC 3 f 7 The strong and superior restorer line Yuanhui 611 (Q611 for short) was bred...

Embodiment 2

[0054] Example 2: The super hybrid rice restorer line 9311 was used as the recipient and the recurrent parent to cross and backcross with the common wild rice in Malaysia, and track the high-yield genes yld1.1 and yld2.1 of the wild rice with the help of molecular marker-assisted selection technology, from BC 4 f 2 Plants carrying wild rice high-yielding genes were initially selected, and their growth period was comparable to that of the recipient parent 9311. The test cross with Pei'ai 64S showed strong heterosis, and the yield per unit area of ​​the test cross combination was more than 20% higher than that of the control (Table 3).

[0055] Table 3 The results of test cross combination of 9311 near-isogenic line and Pei'ai 64S

[0056] Effective theory produces practice

[0057] thousand grains

[0058] Plant Height Ear Length To...

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PUM

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Abstract

A method for increasing the high yield potential of hybridized rice includes hybridizing and continuous backcrossing to introduce the high-yield genes yld 1.1 and/or yld 2.1 of Malaysian wild rice O. rufipogon to the parent of hybridized rice, descriminating the plants carrying said high-yield gene by molecular marker aided selection, analysis, screening the dominant plants, breeding the strong and dominant recovery line, and pairing the combination of cross rice.

Description

technical field [0001] The invention relates to a technique for breeding new plant varieties. Background technique [0002] my country's current population exceeds 1.25 billion, and the per capita arable land area is less than 1.3 mu. The annual increase in population and the decrease in arable land have become an irreversible trend in the near future. It is estimated that in the 1930s, my country's population will increase to 1.6 billion, and per capita arable land will decrease. Grain self-sufficiency is still an urgent issue before us. An effective measure to solve this problem is to continue to increase the grain yield per unit area through the improvement of crop varieties. Practice has proved that: each innovation of breeding methods and application of new materials will bring about a substantial increase in crop yield potential. The dwarf breeding of rice varieties in my country that began in the mid-1950s and the large-scale application of hybrid rice in the 1970s w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01H1/02
Inventor 邓启云袁隆平李继明邓小林万宜珍熊跃东庄文
Owner HUNAN HYBRID RICE RES CENT
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