The gynogenesis-inducer lines were used to induce maternal haploid,and this technology had been widely used in maize breeding,which accelerated the breeding process. The concept of haploid and its botanical morphology were introduced in this paper. The methods for obtaining and doubling of maize haploid and the screening method for haploid in breeding were introduced, the main way to obtain haploid included distant hybridization, anther culture, microspores culture, physical induction, chemical induction, i...
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