Two new species of Sicyos (Cucurbitaceae) from Guerrero and Oaxaca, Mexico

Rodríguez‐Arévalo, Isela; Lira, Rafael; Dávila, Patricia

doi:10.1111/j.1095-8339.2004.00288.x

Cited by 3 publications

(2 citation statements)

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“…The Sicyos clade, including the segregate genera, is especially diverse in Mexico, where several new species have been discovered in the recent past (Lira, 1994; Lira & Rodríguez‐Arévalo, 1999; Rodríguez‐Arévalo & Lira, 2001; Rodríguez‐Arévalo, 2003; Rodríguez‐Arévalo et al. , 2004, 2005).…”

Section: Introductionmentioning

confidence: 99%

Radiation following long‐distance dispersal: the contributions of time, opportunity and diaspore morphology in Sicyos (Cucurbitaceae)

Sebastian

Schaefer

Lira

et al. 2012

Journal of Biogeography

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Aim To infer the most plausible explanations for the presence of 14 species of the Neotropical cucurbit genus Sicyos on the Hawaiian Islands, two on the Galápagos Islands, two in Australia, and one in New Zealand. Location Neotropics, the Hawaiian and Galápagos archipelagos, Australia and New Zealand. Methods We tested long‐problematic generic boundaries in the tribe Sicyoeae and reconstructed the history of Sicyos using plastid and nuclear DNA sequences from 87 species (many with multiple accessions) representing the group’s generic and geographic diversity. Maximum likelihood and Bayesian approaches were used to infer relationships, divergence times, biogeographic history and ancestral traits. Results Thirteen smaller genera, including Sechium, are embedded in Sicyos, which when re‐circumscribed as a monophyletic group comprises 75 species. The 14 Hawaiian species of Sicyos descended from a single ancestor that arrived c. 3 million years ago (Ma), Galápagos was reached twice at c. 4.5 and 1 Ma, the species in Australia descended from a Neotropical ancestor (c. 2 Ma), and New Zealand was reached from Australia. Time since arrival thus does not correlate with Sicyos species numbers on the two archipelagos. Main conclusions A plausible mechanism for the four trans‐Pacific dispersal events is adherence to birds of the tiny hard fruit with retrorsely barbed spines found in those lineages that underwent long‐distance migrations. The Hawaiian clade has lost these spines, resulting in a lower dispersal ability compared with the Galápagos and Australian lineages, and perhaps favouring allopatric speciation.

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Section: Introductionmentioning

confidence: 99%

Radiation following long‐distance dispersal: the contributions of time, opportunity and diaspore morphology in Sicyos (Cucurbitaceae)

Sebastian

Schaefer

Lira

et al. 2012

Journal of Biogeography

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“…In Oaxaca, M. helleri (amole) roots are used as a soap substitute (Lira and Caballero, 2002) and they are very similar to S. bulbosus roots. Chemical studies on M. helleri roots established two saponins, named amoles F and G, as oleanane-type triterpene glycosides (León et al, 1998) while S. bulbosus (Rodríguez-Arévalo et al, 2004) has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Bioactive saponins from Microsechium helleri and Sicyos bulbosus

et al. 2011

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Eleven oleanane-type saponins (1-11) have been isolated from Microsechium helleri and Sicyos bulbosus roots and were evaluated for their antifeedant, nematicidal and phytotoxic activities. Saponins {3-O-β-D-glucopyranosyl (1→3)-β-D-glucopyranosyl-2β,3β,16α,23-tetrahydroxyolean-12-en-28-oic acid 28-O-α-L-rhamnopyranosyl-(1→3)-β-D-xylopyranosyl-(1→4)-[β-D-xylopyranosyl-(1→3)]-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside} (1), and {3-O-β-D-glucopyranosyl-2β,3β,16α,23-tetrahydroxyolean-12-en-28-oic acid 28-O-α-L-rhamnopyranosyl-(1→3)-β-D-xylopyranosyl-(1→4)-[β-D-xylopyranosyl-(1→3)]-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside} (2) were also isolated from M. helleri roots together with the two known compounds 3 and 4. Seven known structurally related saponins (5-11) were isolated from S. bulbosus roots. The structures of these compounds were established as bayogenin and polygalacic glycosides using one- and two-dimensional NMR spectroscopy and mass spectrometry. Compounds 7, 10, bayogenin (12) and polygalacic acid (13) showed significant (p<0.05) postingestive effects on Spodoptera littoralis larvae, compounds 5-11 and 12 showed variable nematicidal effects on Meloydogyne javanica and all tested saponins had variable phytotoxic effects on several plant species (Lycopersicum esculentum, Lolium perenne and Lactuca sativa). These are promising results in the search for natural pesticides from the Cucurbitaceae family.

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