8LICHTER R. Induction of haploid plants from isolated pol- len of Brassica napus [J]. Zeitischri ft Fiir P flanzenphysi- ologic, 1982,105 (5) :427-434.
9TAKAHATA Y, KELLER W A. High frequency embryo- genesis from mierospore culture of Brassica oleracea [J]. Plant Breeding, 1990,40(1) : 134 -135.