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Phylogenetic relationship and morphology of Dalzellia gracilis (Podostemaceae, subfamily Tristichoideae) with proposal of a new genus


Koi, S; Rutishauser, R; Kato, M (2009). Phylogenetic relationship and morphology of Dalzellia gracilis (Podostemaceae, subfamily Tristichoideae) with proposal of a new genus. International Journal of Plant Sciences, 170(2):237-246.

Abstract

Dalzellia gracilis, an enigmatic species of Podostemaceae, is characterized by the subcylindrical creeping roots
and dorsiventral ribbonlike shoots borne on the roots. To reveal the phylogenetic relationships of D. gracilis,
molecular phylogenetic and morphological analyses were performed. A matK tree indicates that it is most likely
sister to a clade of its congeners and Indotristicha ramosissima. Dalzellia gracilis, like Tristicha, has subcylindrical, roots, and it exhibits an endogenous developmental pattern in both shoots and associated
holdfasts shared byTerniopsis, Indotristicha, andTristicha. The dorsiventral ribbonlike adventitious shoots, with
the dorsiventral compressed shoot apical meristem producing dimorphic leaves on the dorsal and ventral-lateral
sides, are extremely similar to the crustose shoots of the other species of Dalzellia. Dalzellia gracilis is devoid of
rosettes, although the other congeners have them. The many free leaves subtending the base of the pedicel are also
unique to the species, whereas the trimerous flower is common to subfamily Tristichoideae. On the basis of these
molecular and morphological results, we describe a new genus Indodalzellia for D. gracilis to draw attention to
these morphological distinctions. Dalzellia, Indodalzellia, and Indotristicha have remarkable morphological
differences compared to the inconspicuous morphological diversity in Tristicha and Terniopsis and between the
two genera.

Abstract

Dalzellia gracilis, an enigmatic species of Podostemaceae, is characterized by the subcylindrical creeping roots
and dorsiventral ribbonlike shoots borne on the roots. To reveal the phylogenetic relationships of D. gracilis,
molecular phylogenetic and morphological analyses were performed. A matK tree indicates that it is most likely
sister to a clade of its congeners and Indotristicha ramosissima. Dalzellia gracilis, like Tristicha, has subcylindrical, roots, and it exhibits an endogenous developmental pattern in both shoots and associated
holdfasts shared byTerniopsis, Indotristicha, andTristicha. The dorsiventral ribbonlike adventitious shoots, with
the dorsiventral compressed shoot apical meristem producing dimorphic leaves on the dorsal and ventral-lateral
sides, are extremely similar to the crustose shoots of the other species of Dalzellia. Dalzellia gracilis is devoid of
rosettes, although the other congeners have them. The many free leaves subtending the base of the pedicel are also
unique to the species, whereas the trimerous flower is common to subfamily Tristichoideae. On the basis of these
molecular and morphological results, we describe a new genus Indodalzellia for D. gracilis to draw attention to
these morphological distinctions. Dalzellia, Indodalzellia, and Indotristicha have remarkable morphological
differences compared to the inconspicuous morphological diversity in Tristicha and Terniopsis and between the
two genera.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Systematic and Evolutionary Botany
Dewey Decimal Classification:580 Plants (Botany)
Uncontrolled Keywords:Dalzellia, Indodalzellia, molecular phylogeny, morphology, Podostemaceae, taxonomy
Language:English
Date:2009
Deposited On:14 Mar 2009 14:53
Last Modified:05 Apr 2016 13:10
Publisher:University of Chicago Press
ISSN:1058-5893
Additional Information:© 2009 by International Journal of Plant Sciences.
Publisher DOI:https://doi.org/10.1086/595292

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