Greenhouse pollination hybridization control method for casuarina

Abstract

The invention discloses a greenhouse pollination hybridization control method for casuarina. The method comprises the steps as follows: the male parent and the female parent of casuarina are grafted to obtain dwarfing hybridization parent plants; a pollination control chamber is built; and after blooming, the method of factorial mating is adopted to ensure that dwarfing hybridization parent plants of different types are pollinated and hybridized freely inter- or intra-species and are moved out from the pollination control chamber to go on growing after female flowers fade completely, so that the hybridization filial generation can be obtained. According to the invention, through tree selection of the dwarfing casuarina parent plants and pollination control of the pollination control chamber, the problems of high cost and low security caused by pollen collection or frame building pollination of large trees in the field can be avoided, and operability of hybridization pollination can be improved; besides, huge material cost and labor capacity of pollen collection and stage, female flower bagging, artificial pollination and the like in the traditional cross breeding can be saved, the detect of very low fruit setting rate and fruiting rate caused by adopting the conventional bagging pollination hybridization method can be overcome, wherein the fruit setting can reach over 90% and the fruiting rate can reach over 50%, the yield of hybridization seeds of casuarina can be increased greatly, and the cross-breeding efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of tree breeding, in particular, the invention relates to a greenhouse-controlled pollination hybridization method for casuarina species. Background technique [0002] Casuarina is a tree species with important ecological, economic and social benefits in tropical and subtropical regions of the world. Casuarina species have the characteristics of wind resistance, salt and alkali resistance, drought and barrenness, fast growth, and short rotation period. They are the main tree species for building coastal shelterbelts in tropical and subtropical regions of the world, and are also industrial timber forests, farmland shelterbelts and forests in coastal areas. It is one of the main tree species for revegetation on difficult sites, and its wood can be used for the production of pulp, board, sawn timber and firewood. At present, the planting area of ​​casuarina plantations in my country has reached more than 300,000 hectare...

AI Technical Summary

Problems solved by technology

[0005] However, when the casuarina has reached physiological maturity, the tree body is tall, and it is extremely difficult and unsafe to collect pollen or bag pollination. The commonly used pollination method of excellent trees is very expensive, and it is easy to be frequently pollinated in a complex environment in the wild. Typhoons or human and animal damage, and low safety; in the open-air environment, casuarina pollen is easily washed by rain or dew, which affects pollination efficiency; pollen collection and storage, female flower bagging and artificial pollination all require huge material costs and workload; in addition, the test results show that because the high temperature and high humidity environment in the bagging is not conducive to the preservation of vigor of Casuarina pollen, the traditional bagging pollination hybridization method has caused the very low fruit setting rate (0-22.6 %, average 7.0%) and seed setting rate (0.6%-19.6%, average 8.1%)

These factors all make the traditional hybrid breeding method used on casuarinas with high cost, low efficiency, poor safety and poor operability

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