The Prefertilization Reproductive Barriers and Overcoming Methods of Horticultural Crops Distant Hybridization
The prefertilization barrier was a decisive factor for successful distant hybridization in horticultural crops. The research progress and value of distant hybridization in the field of horticultural crop breeding in recent years was summarized chiefly. The types, characteristics and mechanisms of prefertilization barriers were reviewed and analyzed comprehensively,including parents' fertilities and crossing compatibility, with emphases on the effective methods to overcome the barriers. These methods include selecting suitable parents, treating the pollens and styles by physical or chemical methods, improving the ways of pollination, fertilization in vitro in the tube, somatic fusion and using bridge parents,etc. At last,the future research emphasis and aim in this field was suggested by the authors.
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