Intersubgeneric Crossability of some <I> Paphiopedilum </I> Species

Abstract

Intersubgeneric crossability of some Paphiopedilum species in subgenus Brachypetalum, Cochlopetalum, Paphiopedilum, Parvisepalum, Polyantha and Sigmatopetalum was studied. Eighteen species were selected to represent of each subgenus. Intersubgeneric hybridization of all those Paphiopedilum were done as well as reciprocal crosses. It was found that crossability of Brachypetalum with Cochlopetalum, Paphiopedilum, Parvisepalum, Polyantha and Sigmatopetalum were 100, 100, 60, 100 and 100%, respectively and those of Paphiopedilum with Brachypetalum, Cochlopetalum, and Sigmatopetalum were 60, 100 and 100%, respectively. Crossability of Parvisepalum with Brachypetalum, Paphiopedilum, Polyantha and Sigmatopetalum were 60, 60, 100 and 60%, respectively. Moreover, crossability of crosses between Polyantha with Brachypetalum, Cochlopetalum, Paphiopedilum, Parvisepalum and Sigmatopetalum were 60, 100, 40, 100 and 100%, respectively. Additional, crossability of Sigmatopetalum with Brachypetalum, Cochlopetalum, Paphiopedilum, Parvisepalum and Polyantha were 100, 100, 40, 80 and 100%, respectively. Incompatibilities were found in Paphiopedilum with Parvisepalum or Polyantha and Parvisepalum with Cochlopetalum. The studies of viable seed percentage were conducted. It  was found that most of crosses could gave high viable seeds except crosses of P. charlesworthii x P. bellatulum, P. jackii x P. villosum, P. callosum x P. primulinum, P. callosum x P. jackii, P. bellatulum x P. primulinum, P. villosum x P. primulinum and P. philippinense x P. jackii gave undeveloped seeds more than viable seeds.