Pollen Morphological Studies in the Burmanniaceae

Chakrapani, P. S. Baby; Raj, Bhoj

doi:10.1080/00173137109430491

Cited by 14 publications

(8 citation statements)

References 8 publications

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“…Successive (Stenar, 1925 ;Schnarf, 1931 ;Arekal and Ramaswamy, 1973 ;Ru$ bsamen, 1986) 1-, 2-(3-, poly-) porate, monosulcate (Chakrapani and Raj, 1971 ; Ru$ bsamen, 1986) Campylosiphon…”

Section: Cyclanthusmentioning

confidence: 99%

Microsporogenesis in Monocotyledons

1999

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This paper critically reviews the distribution of microsporogenesis types in relation to recent concepts in monocot systematics. Two basic types of microsporogenesis are generally recognized : successive and simultaneous, although intermediates occur. These are characterized by differences in tetrad morphology, generally tetragonal or tetrahedral, although other forms occur, particularly associated with successive division. Successive microsporogenesis is predominant in monocotyledons, although the simultaneous type characterizes the ' lower ' Asparagales. Simultaneous microsporogenesis also occurs in Japonolirion and Petrosa ia (unplaced taxa), some Araceae, Aponogeton, Thalassia and Tofieldia (Alismatales), Dioscorea, Stenomeris and Tacca (Dioscoreales), and some Commelinanae : Arecaceae (Arecales), and Cyperaceae, Juncaceae and Thurniaceae (Poales). Simultaneous microsporogenesis is of phylogenetic significance within some of these groups, for example, Asparagales, Dioscoreales and Poales. An intermediate type is recorded in Stemonaceae (Pandanales), Commelinaceae (Commelinales) and in Eriocaulaceae and Flagellariaceae (Poales). There is little direct relationship between microsporogenesis type and pollen aperture type in monocots (except for trichotomosulcate and pantoporate apertures), although trichotomosulcate apertures in monocot pollen, and equatorial tricolpate and tricolporate apertures in eudicot pollen, are all related to simultaneous microsporogenesis.# 1999 Annals of Botany Company Huynh K-L. 1976. Arrangement of some monosulcate, disulcate, trisulcate, dicolpate, and tricolpate pollen types in the tetrads, and some aspects of evolution in the angiosperms. In : Ferguson IK, Muller J, eds. The e olutionary significance of the exine. London : Academic Press, 101-124. Huynh K-L. 1980. La morphologie du pollen de Pandanus subg. Vinsonia (Pandanaceae) et sa signification taxonomique. Pollen et Spores 22 : 173-189. Huynh K-L, Stone BE. 1981. On a new subsection of Pandanus section Cauliflora (Pandanaceae) with paniculate staminate inflorescence structure, distinctive leaf anatomy and pollen morphology.

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“…Successive (Stenar, 1925 ;Schnarf, 1931 ;Arekal and Ramaswamy, 1973 ;Ru$ bsamen, 1986) 1-, 2-(3-, poly-) porate, monosulcate (Chakrapani and Raj, 1971 ; Ru$ bsamen, 1986) Campylosiphon…”

Section: Cyclanthusmentioning

confidence: 99%

Microsporogenesis in Monocotyledons

1999

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“…data). Data for other Dioscoreaceae with hermaphrodite flowers are from Caddick et al (1998), and data for Burmanniaceae are from Chakrapani and Raj (1971), Rü bsamen (1986), andCaddick et al (1998). Three continuous characters (pollen size, perforation density, and perforation size) were coded using Thiele's gap weighting method as implemented by MorphoCode (Schols et al 2004), with n ϭ 10, where n is the number of allowed character states in the Thiele formula (Thiele 1993).…”

Section: Methodsmentioning

confidence: 99%

Pollen Evolution in Yams (<I>Dioscorea</I>: Dioscoreaceae)

Schols¹,

Wilkin²,

Furness³

et al. 2005

issn: 0363-6445

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ABSTRACT. Pollen character evolution in yams (Dioscorea: Dioscoreaceae) was investigated in relation to the phylogeny obtained from a recent combined analysis of rbcL and matK gene sequences. The following characters were evaluated: pollen size, aperture number, sexine ornamentation, perforation density, and orbicule presence or absence. Continuous characters were coded using the gap weighting method. Each character was optimized using MacClade onto a tree selected at random from analyses based on molecular data of Wilkin et al. The results indicate that in Dioscorea pollen size decreases in the more derived clades. The latter observation may be related to the evolution of annually replaced tubers. Aperture number increases from one in the monosulcate Stenophora clade (sister to the rest of Dioscorea) to two in other Dioscorea clades. This may be related to the presence of simultaneous microsporogenesis in Dioscorea. A perforate sexine is plesiomorphic in Dioscorea and a striate pattern has evolved more than once and is particularly characteristic in the Malagasy clade. Sexine ornamentation in the Stenophora clade is diverse. The endemic allotetraploid D. pyrenaica is characterized by large, monosulcate, gemmate pollen. The Dioscorea B clade is characterized by pollen with small, dense perforations. Orbicules occur in all Dioscorea species, but are absent in most of the outgroup taxa.

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“…In particular, tree topologies recovered in recent analyses revealed Tacca Forster & Forster (1776: 69) to be sister to core Thismieae species representing the genera Thismia, Oxygyne, Haplothismia and Tiputinia, but with Afrothismia sister to both (Merckx et al 2009, Merckx & Smets 2014. Despite this apparent polyphyly, however, Thismieae are readily distinguished from Tacca on the basis of pollen morphology (Cranwell 1953, Chakrapani & Raj 1971, and the two have hence been treated as separate from Burmanniaceae within Dioscoreales by APG IV, in the hope that this taxonomic issue will be resolved by further study (APG, 2016).…”

Section: Introductionmentioning

confidence: 99%

Thismia nigricoronata, a new species of Burmanniaceae (Thismieae, Dioscoreales) from Vang Vieng, Vientiane Province, Laos, and a key to subgeneric classification

Kumar¹,

Gale²,

Li³

et al. 2017

Phytotaxa

594

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Thismia nigricoronata is described as a new species in family Burmanniaceae. Both morphological and phylogenetic analyses indicate that this new Lao endemic is allied to T. taiwanensis in section Glaziocharis, and it can be differentiated on the basis of its longer vestigial stem leaves, reflexed free outer perianth lobes and ornamented, vibrantly coloured outer surface of the perianth tube. The infrageneric taxonomy of Thismia is reviewed, the genera Geomitra and Scaphiophora are officially reduced to sectional status in Thismia, and all species are enumerated in systematic order. A key to all currently accepted subgenera, sections and subsections is presented to facilitate further examination of their phylogenetic integrity in light of apparent conflict between the traditional morphology-based system and the emerging DNA-based classification.

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Pollen Morphological Studies in the Burmanniaceae

Cited by 14 publications

References 8 publications

Microsporogenesis in Monocotyledons

Microsporogenesis in Monocotyledons

Pollen Evolution in Yams (<I>Dioscorea</I>: Dioscoreaceae)

Thismia nigricoronata, a new species of Burmanniaceae (Thismieae, Dioscoreales) from Vang Vieng, Vientiane Province, Laos, and a key to subgeneric classification

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