Abstract
Phylogenetic relationship among some species of Trichosanthes L ( Cucurbitaceae ) was assessed using internal transcribed spacer (ITS) sequences of nuclear ribosomal DNA to infer the taxonomic status of Trichosanthes anguina . The parsimony analysis of the entire ITS region resulted in 85 maximally parsimonious trees (MPTs) with a total length of 100 steps, a consistency index (CI) of 0.8800 (0. 8378 excluding uninformative characters), a homoplasy index (HI) of 0.1200 (0. 1622 excluding uninformative characters), rescaled consistency index (RC) of 0.7733 and a retention index (RI) of 0.8788. Our findings support the recognition of T. cucumerina var. anguina (L.) Haines as a variety of T. cucumerina .
Highlights
Genus Trichosanthes L. of tribe Trichosantheae, subtribe Trichosanthinae, family Cucurbitaceae include c. 100 species [1,2,3,4,5]
All bootstrap strict consensus trees resulting from the analysis of internal transcribed spacer (ITS) sequences of nrDNA resolves two major clades i.e (1) T. lepiniana-T. tricuspidata (100 bootstrap support) and (2) T. diocia-T. cucumerina (74% bootstrap support)
T. kirilowii sampled from South Korea show polytomy at base with both the groups (Fig. 1), clearly nested with T. lepiniana-T. tricuspidata group within NJ tree (Figs. 2-3)
Summary
Genus Trichosanthes L. of tribe Trichosantheae, subtribe Trichosanthinae, family Cucurbitaceae include c. 100 species [1,2,3,4,5]. Cucumerina (L) Haines as a wild variant with short fruits and T. cucumerina var. Anguina (L.) Haines as cultivated variant with elongated, snake-like fruits. 1980 [6] followed Haines, 1921-1924 [9] treatment of T. anguina as a variety of T. cucumerina. Chakravarty, 1982 [10], treated these two varieties as two different species. This treatment has been followed in most of the Indian floras, monographs and research paper published so far. This study was undertaken to compare sequences of the internal transcribed spacer regions of nrDNA in some species of Trichosanthes in order to infer taxonomic status of T. anguina
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