Breeding method of continuously and directly seeding carly and late rice breed

A variety, rice technology, applied in the fields of rice cultivation, botanical equipment and methods, plant genetic improvement, etc., can solve the needs of the continuous cropping method that cannot adapt to morning and evening direct seeding, affect the yield and commerciality of later season rice, and the variety of later rice Mixed and other problems, to achieve the effect of reducing labor cost and pesticide pollution to the environment, short grouting maturity period, and low thousand-grain weight

Inactive Publication Date: 2005-10-12
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, it is difficult for early direct seeding rice to grow seedlings at low temperatures, and the varieties used before and after late rice direct seeding are different. Grain shattering during harvesting of the previous crop will cause mixed rice varieties in the latter crop and weeding of the ric

Method used

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Embodiment 1

[0028] Early indica 768 / Zao indica 774 / / The hybrid offspring of late indica Maba Xiaonian (F 6 ), by ion beam mutagenesis (N + , energy 30keV, dose 5×10 15 ~2×10 16 ), after four years and eight generations of breeding, new rice lines such as 1139-3 were bred in the autumn of 2000. In the spring of 2001, a comparison test was carried out, and the yield per unit area of ​​1139-3 was 486.5 kg. In the autumn of 2001, 0.79 mu was planted, and the measured yield per mu was 457.4 kg; from the spring of 2002 to the autumn of 2003, the new variety 1139-3, which was continuously cropped in the morning and evening, was continuously tracked and measured in spring and autumn. In 2002, 6 mu was planted, and the yield per mu was 1124.5 kg kg; 32 mu were planted in 2003, and the yield per mu in two seasons was 1004.3 kg. In 2004, Anhui Provincial Variety Approval Committee organized multi-point production experiments, and the average yield per mu of 1139-3 was 423kg, which was 10.82% high...

Embodiment 2

[0030] Through hybridization, the cold-resistant genes in Yunnan rice varieties Chongji and Yunhui 72 were transferred to the early rice variety Zaoxian 14 bred by ion beam mutagenesis. Under low temperature stress conditions indoors, new rice lines with strong cold tolerance in germination and emergence were screened. After years of continuous field identification, a new early rice variety Zhizao 038 with strong cold tolerance has been bred. This strain has strong cold tolerance and can reach a seedling rate of 75% at a low temperature of 10-12°C. For two consecutive years, the seeds were sown in late March, and all seedlings were sown at one time, so that the sowing date was advanced by about 20 days. In 2003 and 2004, it participated in the regional trial of early indica in Anhui Province. This variety showed strong cold resistance at seedling stage, high rice quality and high yield. The average yield per mu in two years was 435 kg, an increase of 3.5% compared with the cont...

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Abstract

A method for selectively culturing the excellent variety of rice includes such steps as choosing parent rices which has high resistance to low temp, high temp and oxygen lack, short dormant period and low optical and temp sensitivities, hydridizing, backcrossing ion beam mediated distant hybridizing for genetic recombination, and genetic modifying to its descendants.

Description

technical field [0001] The invention relates to a rice variety breeding method adapted to light and simple cultivation and farming methods. The combination of variety and technology achieves the purpose of reducing labor intensity and cost and improving production efficiency in the rice production process. Background technique [0002] Rice is one of the most important food crops in my country. The production of double-cropping rice occupies an important position in rice production in my country. The general light and temperature conditions in southern my country's rice fields can meet the production requirements of double-cropping rice. Anhui is located at the northern edge of the area, and the light and temperature conditions for rice production are basically sufficient for the production of double-cropping rice with two crops a year. During the grain recovery period, the province's double-cropping rice planting area has a relatively large development. In history, the ...

Claims

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Application Information

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IPC IPC(8): A01G22/22A01H1/02
Inventor 余增亮程太平吴跃进王安东杨惠成吴敬德
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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