Method for improving propagating efficiency of catalpa bungei grafting rootstock

Abstract

The invention discloses a method for improving the propagating efficiency of catalpa bungei grafting rootstocks and belongs to the field of propagation of elite tree species. In the process of catalpa bungei grafting during rootstock cultivation with sowing and seedling raising, part of seedlings cut off from the upper part of a catalpa seedling for producing the rootstock carries out cutting propagation, and the seedlings can be used for grafting the rootstocks after one year; in other words, besides the first-time rootstock production with sowing and seedling raising, the rootstocks are obtained by raising seedlings by cutting of part of seedlings cut off from the upper part of a rootstock block, and the method is circularly applied to the grafted propagating of catalpa bungei. The cycle of raising seedlings by cutting achieving the condition of producing the grafted rootstocks is one year, and the regular two-year cycle of sowing and seedling raising is shortened by one year, so that the seedling raising efficiency is greatly improved, and the rate of survival of seedling raising is greatly increased. The cut off catalpa stems after producing the grafted catalpa rootstocks are fully utilized, so that the resource waste is avoided, and the seedling raising cost of rootstock production is reduced. Therefore,, the quick rootstock cultivation is realized, and the propagating efficiency of catalpa bungei grafting is greatly improved.

Description

technical field [0001] The invention relates to the field of forest tree breeding, in particular to a method for improving the propagation efficiency of catalpa grafted rootstocks. Background technique [0002] Catalpa bungei C.A.Meyer. belongs to the Bignoniaceae family and belongs to the genus Catalpa. It has been cultivated in my country for more than 2,000 years. It is a precious and high-quality timber tree species and a valuable garden ornamental tree species in my country. It has been included in the national timber strategic reserve tree species. Table of contents. Due to the incompatibility of self-pollination, catalpa often blooms and does not bear fruit; even if different clones are mixed together, they can bear fruit after pollination by insects, but there are few seeds, the germination rate of seeds is very low, and seed reproduction is difficult. Catalpa is a tree species that is difficult to root, and the survival rate of cutting propagation is low, and the ex...

AI Technical Summary

Problems solved by technology

Due to the incompatibility of self-pollination, catalpa often blooms and does not bear fruit; even if different clones are mixed together, they can bear fruit after pollination by insects, but there are few seeds, the germination rate of seeds is very low, and seed reproduction is difficult

Catalpa is a tree species that is difficult to root, and the survival rate of cutting propagation is low, and the existing related cutting technology is not easy to be popularized and applied in actual production due to high operation requirements, or the need for facility conditions, or labor-intensive and high cost

Although root burial propagation is relatively easy, root burial propagation objectively restricts the scale of breeding because of its relatively small number of propagation materials.

Although tissue culture reproduces quickly, it requires a large investment in equipment conditions, high technical requirements, and high production costs.

At present, the seedlings of catalpa are mainly used as rootstocks for grafting and propagation to cultivate good seedlings of catalpa, but rootstocks must first be cultivated for grafting. At present, rootstocks are mostly cultivated by catalpa seedlings in production, but it takes at least 2 years after sowing to achieve The thickness required for grafting rootstock has the disadvantage of long production cycle for rootstock cultivation

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