Cytological Investigations in the Genus Lantana in India.

Ojha, B. M.; Dayal, Narsinha

doi:10.1508/cytologia.57.9

Cited by 7 publications

(11 citation statements)

References 7 publications

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“…The present chromosome count of n=22 in Lantana camara agrees with previous studies for Lantana camara populations from South Africa, the Caribbean and India, and shows that the species is tetraploid (x=11) and always has multivalents and univalents, (Sen and Sahni 1955, Raghavan and Arora 1960, Spies 1984, Sanders 1987, Ojha and Dayal 1992, Sinha et al 1995. The present study does not report multivalents in the species but does report considerable amount of aberrant microsporads.…”

Section: Chromosomal Statussupporting

confidence: 91%

Cytomorphological Studies on Some North Indian Members of the Family Verbenaceae

Bala

Gupta

2012

CYTOLOGIA

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Summary This paper presents cytomorphological diversity covering the chromosome number, meiotic behavior and pollen study of 5 species on an accession basis under the family Verbenaceae from North India. Six new chromosome reports have been made for the first time which involve 2 varied chromosome counts; n=18 for Caryopteris odorata and n=6 for Verbena officinalis; 3 new euploid cytotypes of diploid (2n=2x=14) for V. officinalis and hexaploid (2n=6x=42) and octaploid (2n=8x=56) for Verbena bonariensis; and B-chromosome for Vitex negundo with 2n=32+0 2B. Morphotypes are identified for 2 species; Caryopteris odorata and Lantana camara, and cytomorphotype for Verbena officinalis. All the investigated species show abnormal meiotic behavior.

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Section: Chromosomal Statussupporting

confidence: 91%

Cytomorphological Studies on Some North Indian Members of the Family Verbenaceae

Bala

Gupta

2012

CYTOLOGIA

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“…The ploidy levels of Lantana in India are similar to those in Australia, with the exception that no weedy variety has been found to be diploid in India (Sinha & Sharma 1984). However, apart from correlative evidence to suggest that pentaploid forms are better adapted than other forms to high altitude conditions in India (Ojha & Dayal 1992), there is little evidence to suggest that different ploidy levels have distinguishing traits or are of ecological significance in the invasion potential of the species. It is now widely recognized that Lantana is morphologically distinct in different regions of its naturalized range compared to Lantana in its native range (Smith & Smith 1982).…”

Section: Ploidy Levelmentioning

confidence: 99%

Lantana invasion: An overview

Sharma

Raghubanshi

Singh

2005

Weed Biology and Management

234

185

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We review the key features of Lantana ( Lantana camara L.), an invasive plant species considered to be among the world's 10 worst weeds. Lantana occurs in diverse habitats and on a variety of soil types, and its spread is encouraged by animal activities and by human disturbances, such as cultivation, road construction, and changes in fire regimes. Lantana is morphologically distinct in the different regions of its invasive range compared to those regions in its native range. The biological attributes contributing to the success of Lantana as an invader species include: fitness homeostasis, phenotypic plasticity, dispersal benefits from destructive foraging activities, widespread geographic range, vegetative reproduction, fire tolerance, better competitive ability compared to native flora, and allelopathy. Mechanical, chemical and biological options for the eradication and control of Lantana are available. It is emphasized that ecosystem-level consequences of Lantana invasion, particularly on the biodiversity of native flora, are little understood and studies are needed to fulfill this knowledge gap.

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“…Qu et al (1998) used meiotic analysis to study Vaccinium species and observed tetrasomic inheritance, as well as the formation of bivalents and multivalents by random pairing among four homologues and a high fertility, all in the same newly formed hybrid. Studies with Lantana camara populations from South Africa, the Caribbean and India have shown that this species is tetraploid (x = 11) and always has uni-, bi-, triand multivalents, (Tjio 1948;Sen and Sahni 1955;Raghavan and Arora 1960;Arora 1961;Sinha and Sharma 1984;Spies 1984;Sanders 1987;Ojha and Dayal 1992;Sinha et al 1995). In Lippia L, the high degree of ploidy has been related to the occurrence of chromosomal abnormalities and, consequently, to abnormal development of the seeds (Poggio et al 1993).…”

Section: Discussionmentioning

confidence: 99%

“…These divergences indicate that the taxonomic position of Verbenaceae species remains unresolved (Raj 1983;Sinha and Sharma 1984). Additionally, the natural occurrence of hybrids and polyploids hinders the precise classification of some taxa (Spies 1984;Sanders 1987;Ojha and Dayal 1992;Rueda 1993;Sanders 2001).…”

Section: Introductionmentioning

confidence: 99%

Meiotic analysis of two putative polyploid species of Verben-aceae from Brazil

2005

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-The natural occurrence of hybrids and polyploids hinders the precise identification of some taxa in Verbenaceae (Lamiales). Since meiotic studies are useful for understanding the chromosomal behavior of plant species, we have examined the meiotic stages and chromosomal behavior of Lippia alba (Mill) N. E. Brown and Lantana camara Plum. in Brazil. Lippia alba and Lantana camara, had normal stages of meiosis, including interphase, leptotene, zygotene, pachytene, diplotene, initial diakinesis, diakinesis, metaphase I, anaphase I, telophase I, prophase II and telophase II. Fifteen and 22 bivalents were observed during diplotene and diakinesis in L. alba and L. camara, respectively. The chromosomes segregated normally during anaphase I, telophase I and II. The regular meiotic behavior seen in L. alba and L. camara indicated that polyploidy was established by a diploid-like behavior in meiosis, although this did not exclude a possible diploid origin.

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Cytological Investigations in the Genus Lantana in India.

Cited by 7 publications

References 7 publications

Cytomorphological Studies on Some North Indian Members of the Family Verbenaceae

Cytomorphological Studies on Some North Indian Members of the Family Verbenaceae

Lantana invasion: An overview

Meiotic analysis of two putative polyploid species of Verben-aceae from Brazil

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