Burmannia championii Thwaites (Dioscoreales: Burmanniaceae), a new addition to the flora of Karnataka

Mesta, Divakar K.; Hegde, Harsha V.; Upadhya, Vinayak; Kholkute, S. D.

doi:10.11609/jott.o2495.1465-8

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Burmannia L. is a genus of herbaceous plants which comprises about 60 species (Nuraliev et al, 2018;Li et al, 2020;Francis et al, 2021;Govaerts et al, 2022;Nuraliev et al, 2022). The genus possesses a pantropical distribution with some representatives extending into subtropical areas; about a half of its species are found in South, East and Southeast Asia (Jonker, 1938;Wood, 1983;Maas et al, 1986;Saunders, 1996;Zhang, 1999;Hsieh and Ohashi, 2000;Wu et al, 2010;Mesta et al, 2011;Tsukaya and Darnaedi, 2012;Merckx et al, 2013;Dang et al, 2015;Suetsugu and Sando, 2017). About one third of the species of Burmannia are fully mycoheterotrophic (lacking chlorophyll).…”

Section: Introductionmentioning

confidence: 99%

Chasmogamy and entomophily in Burmannia disticha (Burmanniaceae)

Vislobokov,

Nuraliev

2023

Front. Plant Sci.

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Burmannia shows a set of floral traits that suggest elaborate mechanisms of animal-mediated pollen transfer. These include flower coloration, septal nectaries and a long and narrow floral chamber. The stamens are synorganized with the common style restricting the entrance to the floral chamber, sometimes forming a gynostegium. Contrary to this apparent zoophilous floral syndrome, several species of Burmannia were reported to perform self-pollination via cleistogamy. Understanding of reproductive systems in Burmannia is complicated by scarcity of available results of direct observations on pollination process. Here we present data on pollination biology of B. disticha obtained during field investigations in Vietnam followed by laboratory analyses of ecologically important floral traits and the captured flower visitors. We found that the anthetic perianth is open, i.e. the flower is chasmogamous. The flowers are visited by various Diptera, Hymenoptera, Lepidoptera and Orthoptera. Of them, the bumblebees (Bombus burmensis), a bee (Coelioxys sp.) and some lepidopterans were revealed to carry pollen of B. disticha. Based on the amount of carried pollen, insect behavior during the visits and general knowledge on biology of these insect taxa, we concluded that the bumblebees act as the principal pollinators of B. disticha, whereas the lepidopterans are considered as its possible pollinators. We compared the lengths of proboscises of the captured insects to the depth of the floral chamber, and found that only the bumblebees and lepidopterans should be able to reach the nectar. Finally, we estimated the pollen-ovule ratio of B. disticha as 6.84, which is comparable to the ratio known in autogamous angiosperms. Based on its flower organization and pollination mechanism, we consider B. disticha an entomophilous and predominantly xenogamous species. Its gynostegium is likely an adaptation for pollen transfer by insects with long proboscises. At the same time, earlier investigations together with pollen-ovule ratio indicate that B. disticha possesses a labile pollination strategy, and autogamy sometimes occurs. Since Burmannia is one of the few angiosperm genera that comprise both mycoheterotrophic (achlorophyllous) and autotrophic (green) species, our study provides important evidence for reconstructions of ecological and morphological evolutionary pathways in relation to the mode of organic nutrition.

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Section: Introductionmentioning

confidence: 99%

Chasmogamy and entomophily in Burmannia disticha (Burmanniaceae)

Vislobokov,

Nuraliev

2023

Front. Plant Sci.

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Biogeography and Conservation

2012

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Tree Species Composition and Distribution Pattern in a Myristica Swamp of Northern Kerala, India

Sreejith

Chandrashekara

Nirmesh

et al. 2016

Curr. World Environ

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Knema Phytosociological studies have been carried out in a Myristica swamp in Northern Kerala to reveal the composition and distribution pattern of different tree species. On the basis of IVI, the family Myristicaceae was dominant and the association is attenuata - Myristica malabarica -Holigarna arnottiana type. The species like Gymnacranthera canarica and Myristica fatua var. magnifica, which are believed to be the essential elements of Myristica swamps, are totally absent here. A total 403 individuals (gbh > 10.1 cm) were recorded with a basal area of 34.25 m2 ha-1 in 0.5 ha. area. Total number of species recorded was 28, which represent 21families in which Myristicaceae represents 48.18% of total IVI. Among two dominant species, Myristica malabarica prefer swampy area hence their number of individual shows decreasing trend when we move from the swamp while the second dominant species Knema attenuata showing a reverse trend and was completely absent in the first five quadrats where soil water content is too high. Species specific eco-physiological studies are required to understand the reasons for change in the distribution pattern of these dominant species.

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Burmannia championii Thwaites (Dioscoreales: Burmanniaceae), a new addition to the flora of Karnataka

Cited by 3 publications

References 4 publications

Chasmogamy and entomophily in Burmannia disticha (Burmanniaceae)

Chasmogamy and entomophily in Burmannia disticha (Burmanniaceae)

Biogeography and Conservation

Tree Species Composition and Distribution Pattern in a Myristica Swamp of Northern Kerala, India

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