Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Inheritance of chloroplast genome in the genus Paulownia in Taiwan.

Abstract

P. taiwaniana, widely used in plantations in Taiwan owing to its fast growing rate, easy propagation through root cuttings and high timber quality, was shown by morphological and isoenzyme analyses to be a natural hybrid between P. fortunei and P. kawakamii. The restriction fragments of chloroplast DNA were analysed by electrophoresis, with 22 restriction enzymes being used to test RFLP. Although no RFLP was observed with 21 enzymes, a 2.8 kb fragment was observed in P. fortunei after SalI digestion, and not in P. kawakamii, P. taiwaniana or the F2 from interspecific crosses between the parents of P. taiwaniana. Two other fragments, of 0.9 and 1.9 kb, were found in P. kawakamii, P. taiwaniana and the F2, but not in P. fortunei. Southern hybridization showed the 2.8 kb fragment to be homologous to the 0.9 and 1.9 kb fragments. The results suggested that P. kawakamii is the maternal parent and P. fortunei the pollen parent of P. taiwaniana.