Chromosome number and polyploidy in Spilanthes Jacq. (Asteraceae: Heliantheae)

Ramachandran, Reshmi Geetha; Rajalakshmi, R

doi:10.1007/s13237-015-0139-y

Cited by 2 publications

(7 citation statements)

References 7 publications

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“…debilis; and (3) taxa with 2n= 63-66, including Acmella sp.1, Acmella sp.2, and Acmella sp.3. The analysis results of chromosome number in the taxa with 2n=52 and 2n= 78 well agreed with previously reported findings (Keil and Stuessy 1975, Jansen and Stuessy 1980, Robinson et al 1981, Jansen 1985a, b, Chung et al 2008, Rajalakshmi and Jose 2011, Ramachandran and Rajalakshmi 2015.…”

Section: Chromosome Number Variationsupporting

confidence: 91%

“…Regarding A. radicans var. radicans, the chromosome numbers in the population from Thailand agreed with those from the other populations in Ecuador (Jansen and Stuessy 1980), El Salvador (Jansen 1985b), and India Jose 2011, Ramachandran andRajalakshmi 2015), but other studies reported n=30-35 (Robinson et al 1981) and 2n= 72 (Jose and Mathew 1995) from the population in Guatemala and South India, respectively. The same mitotic number 2n= 78 was also observed in another variety A. radicans var.…”

Section: Chromosome Number Variationsupporting

confidence: 59%

“…This corresponded to the meiotic numbers as 2n=ca.26II from Taiwan (Jansen 1985b) and the mitotic numbers as 2n= 52 from the other populations of Taiwan (Chung et al 2008) and India (Ramachandran and Rajalakshmi 2015). The northern and southern populations of A. uliginosa in Thailand showed the somatic number 2n= 52, which was congruent with the meiotic analysis as n=26 (Jansen 1985a) and 2n=26II (Jansen 1985b) from Trinidad, and the somatic number as 2n=52 from Taiwan (Chung et al 2008) and India Jose 2011, Ramachandran andRajalakshmi 2015). However, the other numbers of n=25 and 2n= 50 were reported from samples from South India (Jose and Mathew 1995).…”

Section: Chromosome Number Variationmentioning

confidence: 71%

“…The present study identified somatic number 2n= 78 in all five populations of A. ciliata, which corroborated the previously reported meiotic number of n=39 (Jansen 1985a) and 2n=39II for plants collected from Colombia (Jansen 1985b). However, other chromosome numbers 2n=52 Jose 2011, Ramachandran andRajalakshmi 2015) and 2n= 65 (Chung et al 2008) were observed from a sample collected from India and Taiwan, respectively. In Taiwan, plants with unusual numbers (2n= 65) were grown alongside typical A. ciliata (2n=78), but they produced no achene in the field.…”

Section: Chromosome Number Variationmentioning

confidence: 98%

“…debilis, whereas a chromosome number of n=ca.26, n=26, and 2n= 52 was found in A. paniculata and A. uliginosa. Conversely, the chromosome numbers of A. ciliata were n=39 and 2n=52, 65, and 78 (Jansen 1985a, b, Chung et al 2008, Rajalakshmi and Jose 2011, Ramachandran and Rajalakshmi 2015. Several studies have suggested that x=12 or x=13 could be a basic number, with polyploidization contributing to the chromosome diversity observed in this genus (Jansen 1985a, b).…”

mentioning

confidence: 99%

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Chromosome number variation in the genus <i>Acmella</i> (Asteraceae) from Thailand

Pitaktharm,

Phiphitphibunsuk,

Suwanphakdee

et al. 2024

CYTOLOGIA

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The genus Acmella Rich. ex Pers., a member of the Asteraceae family, possesses spicy and pungentflavored capitula. These capitula are widely used as vegetables and medicinal plants, prized for their anesthetic and anti-inflammatory properties. A preliminary survey uncovered morphological variations among Acmella plants in Thailand, complicating their taxonomic classification. This study investigates variations in Acmella plants distributed across several regions in Thailand using taxonomic and cytogenetic assessments, aiming to better understand their taxonomic position, genomic relationship, and the role of polyploidization within this genus. Taxonomy and conventional cytogenetic analysis of 24 accessions of Acmella collected from eight provinces in Thailand revealed five accepted species, one variety, and three undescribed taxa. This study identified and classified them into three groups based on chromosome numbers and ploidy levels. The tetraploid group comprised A. paniculata and A. uliginosa, with 2n=52; the hexaploid group comprised A. brachyglossa, A. ciliata, A. radicans var. radicans, and A. radicans var. debilis, with 2n= 78. However, the unidentified taxa, which comprised Acmella sp.1, Acmella sp.2, and Acmella sp.3, were placed into the pentaploid group, with 2n=65, and aneuploidy of 65. The chromosome size ranged from 0.70 to 4.50 µm. The type and position of satellite chromosomes varied among taxa, with certain types of chromosome rearrangement observed, especially in A. uliginosa. Overall, our findings support the allopolyploidization mechanisms in Acmella and suggest the origin of interspecific hybrids in the undescribed taxa from Thailand.

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