Method for production of superior Stevia rebaudiana Bertoni. F1 generation seeds

Abstract

The invention provides a method for production of superior Stevia rebaudiana Bertoni. F1 generation seeds. The method for production of superior Stevia rebaudiana Bertoni. F1 generation seeds mainly comprises selecting an optimal Stevia rebaudiana Bertoni. planting region in China as a Stevia rebaudiana Bertoni. planting base, wherein the optimal Stevia rebaudiana Bertoni. planting region is located at the middle and lower reaches of Changjiang River and in Central and East China, utilizing two varieties of Zhongshan 2 and Zhongshan 3 having excellent quality, good agronomic characters, the basically same flowering phases and good compatibility as Stevia rebaudiana Bertoni. F1 generation seed parents, and carrying out propagation of seed production seedlings of which female parent and male parent amounts are the same by a cuttage asexual propagation method. The method for production of superior F1 generation seeds of Stevia rebaudiana Bertoni. sugar-yielding crops provides a fundamental and effective approach and a guarantee for solving the key problem of Stevia rebaudiana Bertoni. raw material quality improvement in the northern area, in other words for solving the key problem of superior Stevia rebaudiana Bertoni. F1 generation seed sources, provides the maximum possibility for promoting and accelerating the update of the superior Stevia rebaudiana Bertoni. varieties especially in the northern area, and is a technical method used for production of seeds of sugar-yielding commercial crops and having high application and popularization values.

Description

technical field [0001] The invention relates to an excellent seed propagation and production method of the sugar crop stevia, belonging to the technical field of plant artificial propagation and cultivation methods. Background technique [0002] Stevia (Stevia rebaudiana Bertoni.) is a perennial herb of Compositae, which grows naturally and distributes in Brazil, Paraguay, Argentina and other regions in South America. It is called Paraguayan sugar beet in its origin, and it is called sugar grass in Brazil. Stevia began to be introduced and cultivated in the mid-1970s, and has been widely cultivated in many countries and regions. Stevioside has gradually become the most promising one due to its high sweetness and low calorie properties, which are significantly superior to sucrose. Natural healthy sugar source. [0003] my country is one of the first countries to introduce stevia. Years of cultivation practice have shown that stevia has a wide range of adaptability and can b...

AI Technical Summary

Problems solved by technology

Because the winter climate in the southern region is relatively warm, the perennial nature of Stevia can be used to preserve the living plant provenance of cuttings and propagation of excellent Stevia varieties in the open field or with a little cold-proof facilities. Generally, it can be propagated by asexual cuttings in spring and autumn. Seedlings, this kind of propagation method can better maintain the relatively stable and excellent species of the variety, and delay the degradation of the variety; and due to the cold winter climate conditions in the northern region, it is necessary to solve the problem of heat preservation and preservation of the living plant provenance of the cutting propagation of the excellent Stevia variety. The cost is greatly increased, so it is generally not suitable to adopt the method of asexual cutting propagation, and only the sexual propagation method of seeds can be used to produce stevia seedlings

At present, the seeds used for cultivation in the northern region are almost self-produced and self-propagating mixed seeds for many years, and the quality of these mixed seeds is degraded year by year, which seriously affects the quality of stevia raw materials