Paulownia taiwaniana, a hybrid between P. fortunei and P. kawakamii (Scrophulariaceae)
Journal
Plant Systematics and Evolution
Journal Volume
178
Journal Issue
3-4
Pages
259 - 269
Date Issued
1991
Author(s)
Wang, Ying-Seng
Abstract
Paulownia taiwaniana, the widely cultivated, commercially important tree, has been suspected of being of hybrid origin at least since its original publication in 1975. Evidence in support of this thesis, derived from a number of different investigations, is presented in this paper.-Strong evidence comes from a controlled pollination study of the two supposed parental species, P. kawakamii and P. fortunei. F1 seedlings, derived from reciprocal crosses between the suspected parents, exhibited identical banding patterns for a number of enzymes (such as SKDH, GOT, and IDH) with P. taiwaniana, when separated by electrophoresis. Furthermore, comparative morphological studies of trichomes and wood parenchyma patterns between the purported parents and P. taiwaniana reveal that this latter qualitatively exhibits characteristics that combine features of both of the suspected parental types. Biochemically, eight enzyme systems were compared in the three species here under discussion, and, without exception, the electrophoretic banding patterns exhibited by P. taiwaniana represented a combination of the alleles of the other two species. Perhaps the most convincing evidence comes from a genetic analysis of the progeny obtained by selfing P. taiwaniana. Genotypic segregation of the offspring based on a single locus each of SKDH and PGI fit the 1:2:1 hypothesis. Genotypic segregation of the offspring based on two loci each of SP and GOT fit the ratio of 3:6:3:1:2:1. This, taken in conjunction with the other data presented, clearly suggests that P. taiwaniana is a hybrid involving P. kawakamii and P. fortunei. © 1991 Springer-Verlag.
SDGs
Type
journal article