Cross breeding method capable of increasing fruiting rate of castanopsis hystrix

Abstract

The invention discloses a cross breeding method capable of increasing the fruiting rate of castanopsis hystrix. The cross breeding method comprises the following steps: S1, a female parent is subjected to castration and bagging; S2, when male flowers of a male parent are in the transitional period from an initial flowering period to a full-bloom period, male inflorescence of the male parent is collected and dried; S3, artificial pollination is performed: when stigmas of female flowers of the female parent are rolled reversely at the angle ranging from 40 degrees to 50 degrees, bags are removed on a sunny day, dry male flower pollen is sufficiently scattered on the stigmas of the female flowers from 9:00 to 10:30, and then bagging is performed; S4, the stigmas of the female flowers do not have mucus or get black 3-5 days after pollination, the bags are removed, the female flowers are exposed and grow naturally, and cross-bred seeds are obtained when green cones turn brown. With the adoption of the castanopsis hystrix cross breeding method, the fruit setting rate of castanopsis hystrix can be remarkably increased, the seed quality can be remarkably improved, the pollination success rate and the fruiting rate of castanopsis hystrix are increased efficiently, and besides, the method is simple to operate, easy to control and stable in effect. The cross breeding method has great significance in solving of the problem about lack of certified seeds of castanopsis hystrix.

Description

technical field [0001] The invention belongs to the technical field of tree breeding. More specifically, it relates to a cross-breeding method for effectively increasing the seed setting rate of red cone. Background technique [0002] red cone ( Castanopsis hystrix ) is an evergreen tree of the Fagaceae Castanopsis genus. It is an important native broad-leaved high-quality and precious timber and multi-purpose tree species in South China. It is mainly distributed in the south of Guangdong, Guangxi, Hainan, Yunnan, Guizhou, Hunan, Jiangxi, Fujian and other provinces in China. , and Medog County in Tibet, and abroad are mainly distributed in Vietnam, Myanmar and India. The central distribution area is in the hilly area below 700m above sea level in southern Guangxi. Red cone has the characteristics of fast growth, wide adaptability, and high benefit. Its trunk is straight, hard, red, strong corrosion resistance, no cracking, no deformation, easy to process, and can be used ...

AI Technical Summary

Problems solved by technology

However, there are many kinds of forest trees and they are very different, which leads to complex and diverse forest tree hybrid breeding techniques. How to achieve the breeding goal of red cone with high quality is a big problem; compared with other tree species, the hybridization of red cone is more complicated. The reasons are: The inflorescence of the cone is relatively complex, consisting of pure male inflorescences, pure female inflorescences and bisexual inflorescences. The amount of pollen is large, the pollen grains are small and light, and they are very easy to be damp and agglomerated. The female stigma is a typical wet stigma. Natural pollination is prone to pollination failure. high rate of empty buds

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