Breeding method of drought resistant and cold tolerant Saccharum varieties/lines containing Erianthus fulvus Ness consanguinity

Abstract

The invention discloses a breeding method of drought resistant and cold tolerant Saccharum varieties / lines containing Erianthus fulvus Ness consanguinity. The method provided in the invention makes use of Erianthus fulvus Ness wild species (E. fulvus) and Saccharum cultivars (Saccharum spp.) to perform "interspecific distant hybridization". The hybrid progenies undergo selection from a seedling stage, i.e. under conditions (dryland, high altitude) with natural environmental stress, thus obtaining new drought resistant and cold tolerant Saccharum varieties / lines suitable to plant at an altitude of over 1300 meters.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to a breeding method for drought-resistant and cold-resistant sugarcane varieties / lines in low-latitude plateau areas. Background technique [0002] Sugarcane is the most important sugar crop in the world and in my country. Variety is the key to the development of sugarcane production. All sugarcane growing countries in the world create new germplasm and breed new varieties by using germplasm resources and sexual hybridization as the main method. In the first half of the 20th century, breeders used the germplasm resources of the genus Saccharum (Saccharum) for "interspecific hybridization" and "noble breeding". The hilly and dry land continued to expand; and in the next 50 years, due to the large inbreeding coefficient of sugarcane and the decrease of wild germplasm from generation to generation, the bred sugarcane varieties eventually resulted in poor adaptability, low yi...

AI Technical Summary

Problems solved by technology

In the first half of the 20th century, breeders used the germplasm resources of the genus Saccharum (Saccharum) for "interspecific hybridization" and "noble breeding". The hilly and dry land continued to expand; in the next 50 years, due to the large inbreeding coefficient of sugarcane and the decrease of wild germplasm from generation to generation, the bred sugarcane varieties were not widely adaptable, had low yields, and poor benefits

But unfortunately, in the sugarcane hybrid breeding in the second half century, due to the arduous and long-term nature of this work, many breeders mostly adopted "inter-variety hybridization" out of the idea of ​​quick success and quick profit.

Especially in my country, although more than 100 sugarcane varieties have been bred successively, and they have played their due role in production, but they all have blood relationship with only a few common parents. Inbreeding leads to narrow genetic basis and poor ability to adapt to the environment. powerful

[0004] Inbreeding inevitably loses genetic heterogeneity, resulting in reduced viability, adaptability, perennial roots and stress resistance of sugarcane varieties

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