Sugarcane cut stem hybridization method for production of hybrid seeds at tropical monsoon climate area

Abstract

The invention relates to the technical field of sugarcane crossbreeding, and provides a method for sugarcane crossbreeding in tropical monsoon climate areas of China. The method comprises the steps of planting sugarcane parents, root inducing treatment of ear stems, cutting and caring the ear stems, isolated crossbreeding and artificial subsidiary pollination, and management of seed ripen process. The method is remarkably characterized in that the ear stems of the sugarcane which are dispersed in a parent nursery or different parent breeding places are cut and transported to a crossbreeding greenhouse when the sugarcane parents blossom, and are subjected to directed hybridization in proper conditions; and during the hybridization period, the ear stems are not influenced by adverse climate conditions, so the method has high breeding efficiency and strong practicability, and realizes high centralization of management.

Description

Technical field: [0001] The invention relates to the technical field of sugarcane hybrid breeding. technical background: [0002] Sexual hybrid breeding is the most important way to improve sugarcane varieties. Sugarcane flowering and hybrid seed production have strict requirements on environmental conditions. The conditions of light, temperature, and humidity in the four stages of flower bud differentiation, pollen development, pollination and fertilization of parent materials must be met at the same time, so as to achieve directional hybridization and obtain hybrid seeds. More than 100 years of experience in sexual hybrid breeding of sugarcane in the world shows that conditions such as photoperiod and temperature between 10° and 20° north and south latitude are conducive to sugarcane hybrid seed production. In my country, tropical monsoon climate areas, especially the southern tip of Hainan Province, have superior natural conditions required for sugarcane flowering and h...

AI Technical Summary

Problems solved by technology

Since the establishment of the field in 1953, various methods have been used, such as field hybridization, female parent spikes to promote roots and then cut down for planting, and male parent flower spikes for pollination when flowering. Although hybrid seeds can be obtained, they need to be replaced frequently The male parent panicle stem has a low utilization rate and is not convenient for centralized management. The environmental conditions such as temperature and humidity during hybridization are not easy to control, and the germination rate of seeds is affected to varying degrees.