A kind of seed production method of Brassica napus hybrid

Abstract

The invention discloses a seed production method of cabbage type hybrid rape. According to the method, on the basis of an existing hybridization system, male parents are overlapped with female sterilecharacteristics and non-transgenic herbicide resistance characteristics of transformation rape, and the like. The former characteristic can ensure that the male parent can only bloom and provide normal pollen, but not fruit, so that the male parent and the female parent can be sown and harvested in a mixed mode in the seed production link; the latter characteristic can enable the true hybrid to have herbicide resistance, and a corresponding herbicide is sprayed in the hybrid production seedling stage, so that weeding is realized while false hybrid can be killed. By adoption of the method, thehybrid seeds are produced, the seed production yield is improved, the seed production cost is greatly reduced, the purity of the hybrid seeds can be guaranteed, the seed production risk is avoided, and the method is safe and efficient.

Description

technical field [0001] The invention belongs to the field of hybrid rape variety breeding and seed production, and in particular relates to a seed production method of Brassica napus hybrids. Background technique [0002] Rapeseed is the main oil crop in my country and one of the most important oil crops in the world. my country is one of the major producers of rapeseed in the world. The annual planting area of ​​rapeseed is about 100 million mu, and the annual output is about 10 million tons, both of which account for 1 / 4 of the total area and total output of rapeseed in the world. my country's rapeseed oil provides nearly 60% of domestic vegetable oil consumption, and it is truly the largest domestic oil (Liu Cheng, Feng Zhongchao, Xiao Tanghua, etc.. The development status, potential and countermeasures of my country's rapeseed industry. Chinese Journal of Oil Crops, 2019, 41(4):485-489). In recent years, domestic rapeseed oil has played an increasingly important role in...

AI Technical Summary

Problems solved by technology

Rapeseed is a dicotyledonous oil crop, so it is extremely sensitive to this type of herbicide, and different rapeseed varieties also have great differences in their tolerance.

(2) It is difficult to grasp the appropriate spraying time

Even for the same rapeseed variety, the growth process of rapeseed is inconsistent due to different fertility levels, soil moisture, and management levels, so the sensitivity to tribenuron-methyl is different.

(3) The spraying period of the agent is narrow

If there is continuous rainy weather during this period, the spraying will be postponed, but at this time, the suitable spraying period will be missed, which will seriously affect the chemical killing effect and the quality of seed production, and the most serious is the failure of seed production

(4) High technical requirements for spraying

Therefore, before harvesting the seeds on the female parent, the male parent needs to be harvested after separating the female parent in advance; even so, because the branches of the parent parent are staggered and the branches of rapeseed are relatively brittle at the mature stage, their branches are often cut when harvesting the male parent. Left over in female shoots causing confusion

At the same time, separate harvesting also greatly increases labor costs

All in all, operations such as separate harvesting of the parents not only increase the cost of seed production, but also put the purity of the hybrid at risk

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