CHROMOSOME ECOLOGY OF BRITISH <i>GALINSOGA</i> SPECIES

Haskell, Gordon; Marks, G. E.

doi:10.1111/j.1469-8137.1952.tb06147.x

Cited by 9 publications

(5 citation statements)

References 5 publications

(2 reference statements)

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“…Somatic and meiotic chromosomal analyses reveal that G. parvifiora is a diploid with 2« = 16 chromosomes, and G. ciliata is an allotetraploid with 2n = 32. A similar observation was made by Haskell and Marks (1952) who considered that the former is a tetraploid and the latter is an octoploid on the basis of jc = 4. However, recent chromosomal studies (see Stuessy, 1977) in the genus Galinsoga strongly suggest that the base number is 8.…”

Section: Discussionsupporting

confidence: 76%

“…The absence of pairinĝ mong meiotic chromosomes in Population III, and the presence of quadrivalents, naphase bridges and laggards during meiosis in G. ciliata strongly favour the view that G. parvifiora is unlikely to be the putative progenitor of G. ciliata which itself is of hybrid origin of segmental allopolyploid type. Haskell and Marks (1952) held a similar view about the origin of G. ciliata. Population IV is a diploid with 2n = 16 chromosomes, and possesses characters of both the triploid hybrid and G. parvifiora (see Table 1).…”

Section: Discussionmentioning

confidence: 67%

“…In all probability, fresh introduction of neither species took place in the Garden between 1972 and 1980. There are reports on chromosome numbers (Haskell and Marks, 1952) and ecotypic differentiation in G. ciliata (Shontz and Shontz, 1972), but no detailed cytogenetical investigations seem to have been carried out on these weedy taxa as far as the authors are aware. The present paper deals with the somatic and meiotic chromosomal analyses of four natural populations inhabiting the different ecological sites within the Experimental Garden, and the role of natural hybridization and introgression in the evolution of weedy races.…”

Section: Introductionmentioning

confidence: 99%

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CYTOGENETICS OF GALINSOGA PARVIFLORA CAV. AND G. CILIATA (RAF.) BLAKE, AND THEIR NATURAL HYBRIDS (ASTERACEAE)

Gopinathan¹,

Babu²

1982

New Phytologist

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SUMMARYThe somatic and meiotic chromosomes of four natural populations of Galinsoga Ruiz & Pav. -Population I (G. parvifiora Cav.), Population II [G. ciliata (Raf.) Blake], Population III and Population IV have been analyzed. Our studies show that G. parvifiora is a diploid (2« = 16); G. ciliata is a segmental allotetraploid (2n = 32); Population III is a triploid natural hybrid between G. parvifiora and G. ciliata (3n = 24); and population IV is a putative introgressant between G. parvifiora and the natural triploid hybrid {In = 16). The meiotic chromosomes form eight hivalents and do not reveal any irregularities in G. parvifiora which shows 100% pollen viability. During the meiosis of G. ciliata, however, 16 bivalents with occasional quadrivalents, anaphasic bridges and laggards are noticed, and pollen viability varies from 90 to 100%. In the triploid hybrids all the 24 chromosomes form univalents which are grouped into an unanalyzable chromosomal entanglement at metaphase I; consequently the per cent pollen viability is 0. The meiotic behaviour of chromosomes in introgressant is similar to that of G. parvifiora, except for the high frequency of quadrivalents and laggards, and lesser pollen viability. The presence of inversion loops in G. ciliata and in Population IV imply that the parental species differ in chromosomal rearrangements.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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CYTOGENETICS OF GALINSOGA PARVIFLORA CAV. AND G. CILIATA (RAF.) BLAKE, AND THEIR NATURAL HYBRIDS (ASTERACEAE)

Gopinathan¹,

Babu²

1982

New Phytologist

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“…Somatic and meiotic chromosomal analyses revealed that G. parviflora is a diploid, with 2 n = 16 chromosomes, and G. ciliata is an allopolyploid (tetraploid), with 2n = 32 chromosomes (Haskell & Marks 1952; Gopinathan & Babu 1982). Furthermore, the similarity in the morphology of the somatic chromosomes between the two species suggests that the diploid might be one of the progenitors of the tetraploid.…”

Section: Botany and Descriptionmentioning

confidence: 99%

“…Furthermore, the similarity in the morphology of the somatic chromosomes between the two species suggests that the diploid might be one of the progenitors of the tetraploid. However, differences in the structural rearrangement of the chromosomes, stomata, and pollen‐grain sizes show that G. quadriradiata is not derived directly from G. parviflora and, thus, the taxonomical difficulties might be related to a possible polyploid series within the genus (Haskell & Marks 1952; Gopinathan & Babu 1982). Natural hybridization between the two species is possible, as reported by Gopinathan and Babu (1982), who found a triploid natural hybrid between G. parviflora and G. ciliata and also a putative introgressant between G. parviflora and the natural triploid hybrid.…”

Section: Botany and Descriptionmentioning

confidence: 99%

Distribution, biology, and agricultural importance of Galinsoga parviflora (Asteraceae)

Damalas¹

2008

Weed Biology and Management

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Galinsoga parviflora, an annual dicot species of the family Asteraceae, is a common herb that is often found in disturbed habitats and agricultural areas in many parts of the temperate and subtropical regions of the world. It is a native of tropical America and the center of its origin is thought to be the mountainous area of Central America. Galinsoga parviflora is considered to be a common weed in several crops of major importance, such as wheat, corn, cotton, tobacco, sugarbeet, tomato, pepper, potato, bean, onion, cabbage, garlic, coffee, citrus, banana, and strawberry; it is frequently found in gardens and uncultivated areas. It succeeds particularly in moist soils and it is favored by a long photoperiod and high light intensity. The significant features of the plant, such as the lack of seed dormancy, rapid growth and development, early flowering, many generations per growing season, production of a great number of seed in a wide range of environmental circumstances, and the ability for easy vegetative reproduction under favorable conditions predispose the plant to be a troublesome weed.These features allow the easy distribution and rapid establishment of the weed in large populations, a fact that often makes this weed difficult to control. Galinsoga parviflora competes strongly, particularly with irrigated crops of short height, and it might also hinder crop harvest. The management of G. parviflora can be achieved by manual weeding, repeated soil cultivation, crop rotation, mulching, and herbicide application. The plant is reported to be edible and is used also for medicinal purposes.

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Cytology of some weedy species of the family Compositae (Asteraceae) from Jos Plateau, Nigeria

Husaini

Iwo

1990

Feddes Repertorium

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Cytological investigation of twenty‐five weedy species belonging to twenty‐three genera were investigated for the first time from Jos Plateau, Nigeria. The chromosome numbers of three taxa; Aspilia kotchyi, Coreopsis asperaia and Lactuca capensis are reported here for the first time, while chromosome numbers of five taxa; Acanthospermum australe, Ageratum conyzoides, Ethulia conyzoides, Galinsoga parviflora and Sclerocarpus africanus differ from their previous chromosome reports.

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CHROMOSOME ECOLOGY OF BRITISH GALINSOGA SPECIES

Cited by 9 publications

References 5 publications

CYTOGENETICS OF GALINSOGA PARVIFLORA CAV. AND G. CILIATA (RAF.) BLAKE, AND THEIR NATURAL HYBRIDS (ASTERACEAE)

CYTOGENETICS OF GALINSOGA PARVIFLORA CAV. AND G. CILIATA (RAF.) BLAKE, AND THEIR NATURAL HYBRIDS (ASTERACEAE)

Distribution, biology, and agricultural importance of Galinsoga parviflora (Asteraceae)

Cytology of some weedy species of the family Compositae (Asteraceae) from Jos Plateau, Nigeria

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