| Summary: | 碩士 === 國立中興大學 === 生命科學院碩士在職專班 === 94 === The indigenous and naturalized plants of Morus in Taiwan would be identified as the two species: M. alba and M. australis. They often grow in the open fields of lowlands and up to the mountains of median elevation. There are 10 taxa to be introduced and cultivated in Taiwan, i.e., M. alba var. macrophylla, var. pendula, var. pyramidalis, var. venosa; M. bombycis cv. ‘Aurantus’ ; M. mongolica var. diabolica; M. Multicaulis; M. nigra, M. nigra cv. ‘Longiflora’ ; M. rubra. These plants are highly morphologically variable and result in many species complexes distributing widely. Therefore, they are somewhat difficult to identify. Each taxonomist had suggested the different systematic treatments of the Morus plants in Taiwan. In order to understand the mechanism of speciation and the interrelationship among species, we employ the RAPD method to study those plants of 25 populations collected from Taiwan. The RAPD dendrogram reveals the genetic similarity coefficients of them being between 0.38-0.89. Most evolutionary variations mainly appear among the individuals of those plants, and they show different genetic combinations; the different environments of their sites affect their internal genetic genes and derive into the various gene flows. According to the studies of our collecting materials, we could find the hybrids reproduced from the parental species of M. alba and M. australis or M. australis and M. multicaulis. Their occurrence could be supported by the data of their morphological characteristics and RAPD analysis. The economical values and medicinal resources of those plants would also be studied. All results could be used for the sustainable utilization of Morus plant resources in Taiwan.
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