Cultivation method of hybrid seedlings of castanea mollissima

Abstract

The invention belongs to the technical field of fruit tree breeding and discloses a cultivation method of hybrid seedlings of castanea mollissima. The cultivation method comprises following steps: 1), collection of hybrid seeds; 2), storage of the hybrid seeds; 3), germination acceleration of the hybrid seeds; 4), sowing and seedling raising of the hybrid seeds; 5), field planting of the hybrid seedlings; 6), spraying of a plant growth regulator on the hybrid seedlings for promoting growth. The cultivation method has following advantages: 1), the collected hybrid seeds are stored at specific low temperature to meet the cold requirement of germination, then seed dormancy removing is induced and germination is accelerated under the specific temperature, humidity and illumination conditions of a manual climatic box, the seeds are cultivated into seedlings at the current year, and the seedling rate is high; 2), by means of comprehensive measures such as growth period prolonging on the basis of nutritive pot seedling culture in a greenhouse as well as repeated spraying of forchlorfenuron for promoting rapid plant growth and the like, the hybrid seedlings grow fast and are high in growth increment, and the first flowering time is early; one feasible technical method for passing through the juvenile stage as soon as possible and shortening the breeding period is provided for fruit trees.

Description

Technical field [0001] The invention belongs to the technical field of fruit tree breeding, and specifically relates to a method for cultivating chestnut hybrid seedlings. Background technique [0002] Different eras require different types of new varieties. The cultivation of new varieties is an eternal research topic, as is fruit trees. Cross-breeding (cross-breeding: mating parents according to specific breeding goals, obtaining hybrids through crosses, then cultivating the hybrids into hybrid seedlings and then selecting them to breed new varieties that meet the requirements of production and consumption, called hybrid breeding) is The most important method for breeding and obtaining new varieties is also the most prominent technical method widely used at home and abroad and with the most outstanding breeding results. [0003] As we all know, the cycle of hybrid breeding of fruit trees is long, and the breeding of a variety from cross to application often takes more than ten o...

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Problems solved by technology

[0005] At present, the cultivation of chestnut hybrid seedlings generally adopts the cultivation method of producing upper chestnut stock seedlings (Yang Liucheng, Jiao Jianghong, Yang Yanli, Li Jing, Huo Ruiqing. Research on chestnut seedling breeding technology. Anhui Agricultural Sciences, 2007, 35 (19): 5743-5743 ; Zhang Mingzhu. Preliminary study on chestnut seedling raising technology. Anhui Agricultural Science Bulletin, 2012, 18(10): 171-171; Yin Meiwang. Chestnut seedling propagation technology. Anhui Agricultural Science Bulletin, 2015, 21(21): 93-94; Chen Hui, Li Changjiang, Linghu Ronggang. Chestnut Seedling Cultivation Techniques. Inner Mongolia Forestry Survey and Design, 2016,39(4):48-49). The general steps of seedling cultivation are: the seeds are collected in the current year and stored in sand → the second year Sow in the field in spring and cultivate into seedlings→plant field growth (3rd-5th year)→flowering and fruiting (about the 6th year), this hybrid seedling cultivation method has the following disadvantages: (1) after the hybrid seeds are collected in autumn, Generally, it is stored in a low temperature environment and gradually passes through its dormant period. It is not until the spring of the second year that seedlings are sown. Under this method, it takes a year to complete from harvesting hybrid seeds to cultivating seedlings. The seeds are about 6-7 months after harvesting. Be in dormant state, cause the waste on the time; (2) conventional seedling cultivation method, seed generally adopts direct seeding mode or simple container mode to raise seedling, does not carry out refinement to seed germination technology, causes the seed germination rate under this method to be generally 70- 80%, and the seedling rate is about 60%, which has the obvious disadvantages of low seed germination rate and seedling rate, resulting in the loss of hybrid seeds, a resource of great breeding value, and the human, material and financial resources invested in the early hybridization work. Waste; (3) spraying plant growth regulators to plants can promote the growth of plants. At present, there is no report about spraying forchlorfenuron to promote growth and early flowering in conventional seedling cultivation methods. Conventional seedling cultivation methods Most of the cultivated hybrid seedlings reach a certain height and the first flowering time is about 6 years, which inevitably has the disadvantage of a long first flowering time

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