Perennial rice naturally wintering rice stump and method for identifying viability thereof

An identification method and a natural technology, applied in the fields of rice cultivation, botanical equipment and methods, plant genetic improvement, etc., can solve the problems of difficult selection of hybrid offspring, and achieve the effect of strong cold resistance, easy to master and good effect.

Inactive Publication Date: 2011-04-06
江西省农业科学院水稻研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that cold resistance is a relatively complex genetic trait, involving two major resistance systems, the main effect and the minor effect. The hybridization of common wild rice and cultivated rice is a distant hybrid, with a wide segregation spectrum, and wild rice is genetically linked. Close, difficult selection of hybrid offspring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] With the strong cold-tolerant Dongxiang wild rice as the female parent and the cultivated rice (excellent indica or japonica variety) as the male parent, sexual crossing and backcrossing are carried out. After the offspring have gone through the severe winter, in February-March of the next spring, the vitality of the rice seedlings is identified. Strong cold-resistant rice stalks can resist severe cold without dying. Visually inspecting the vitality of rice stalks, the leaf sheaths of rice stalks are withered and light yellow, the stems are straight and strong, and there is resilience when touched by hands (the hand dial can be tilted at 30-60 degrees, which can be restored), and the feet are elastic (30-60 degrees of inclination of the foot pressure can be recovered), and the new line (variety) of perennial rice can be bred by the selection of 6-8 generations by this overwintering rice stalk.

[0014] The new perennial rice strains bred are planted, harvested at maturit...

Embodiment 2

[0016] Breeding of restorer line 907691 with strong cold tolerance. The restorer line uses Dongxiang wild rice as the male parent, crossed with the fine indica rice Ganzaoxian 49, and recrossed. The rice husks of the F2 to F8 generation populations survived the winter naturally. In the spring of the second year, the vigor of the rice husks was visually observed, and the sheaths of the rice husks were withered and light yellow. , the stem pile is straight and strong, and it has resilience when touched by hand (the hand dial is inclined at 30-70 degrees, and it can be restored), and the foot is elastic (the foot is inclined at 30-70 degrees, and it can be restored). The 907691 restorer line bred by this identification method can survive the winter naturally in Nanchang (when encountering a low temperature of -10°C).

Embodiment 3

[0018] Breeding of strong cold-tolerant three-line maintainer line "4788". "4788" is a female parent of Dongxiang wild rice, crossed with excellent parent Japonica "0298", and then backcrossed with Japonica "0298". Backcross population B 1 f 2 to B 1 f 6 Generations of rice stalks survived the winter under natural conditions, and in the spring of the following year (early and mid-March), the dormant buds of rice stalks germinated into seedlings, and the above-mentioned method was used to breed the strong cold-tolerant line "4788" (overwintered under natural conditions in Nanchang, encountered the lowest temperature -5℃), using the "4788" strong cold-tolerant line and wild-type male sterile line for test crossing F 1 The performance of abortion is good, and it has been backcrossed continuously for 6 generations, and the male sterile line "4788" with strong cold resistance is bred (it can survive the winter under natural conditions, and the lowest temperature is -12 ℃).

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Abstract

The invention relates to a method for identifying viability of perennial rice naturally wintering rice stump, in particular to a method for breeding highly cold-resistant rice materials. The method is characterized in that: via performing sexual hybridization and backcross to cultivated rice and highly cold-resistant Dongxiang wild rice, then the later remained stump can live through the winter under a natural condition; in the next spring, the rice stump is dormant bud and germinates into seedlings, and the new perennial rice variety is obtained through 6 to 8 generations. The new perennial rice variety grows maturely and is harvested; the remained stump can live through the winter under the natural condition; the viability of the rice stump is identified after a clod winter (extremely low temperature at minus 12 DEG C); the identifying method relates to visual observation and touching identification. The method has the characteristics of convenience, fastness, easy control, excellent effect and the like. The new rice variety identified by the method is highly cold-resistant and is capable of wintering naturally. Breeding the perennial rice stump has great significance in the development of food production.

Description

technical field [0001] The invention relates to an identification method for crops, in particular to an identification method for natural overwintering rice husk vigor of perennial rice. Background technique [0002] In the history of rice cultivation in my country, rice production often encountered the hazards of cold spring and autumn cold dew. Chilling injury is one of the main factors affecting the high yield, stable yield and quality of rice. Rice is an annual food crop. To make rice perennial, it is necessary to introduce strong cold tolerance and promote cold resistance of rice. Dongxiang wild rice is the common wild rice with the highest distribution latitude found so far. It has strong cold tolerance, which will bring an opportunity to enhance the cold resistance of rice. The identification results of cold-resistant rice varieties at home and abroad show that: cold-resistant varieties can resist low temperature or reduce the damage of low temperature under low temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01H1/02A01G16/00A01G22/22
Inventor 陈大洲肖叶青罗世友胡兰香邬文昌吴小燕熊焕金邓伟刘兰英
Owner 江西省农业科学院水稻研究所
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