Cytological Studies in Some Members of Tribe Senecioneae (Asteraceae) from North and Central India

Gupta, Raghbir Chand; Bala, Santosh; Goyal, Henna; Malik, Reyaz Ahmad; Kumari, Santosh

doi:10.1508/cytologia.75.369

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…The chromosomes of S. rufinervis (DC.) C. Jeffrey & Y. L. Chen were reported, also from Indian material and under the name Senecio rufinervis DC., to have n = 18 (Mehra and Remanandan 1975 ), n = 10 (Gupta and Gill 1981 , 1989 ; Gupta et al 2010 ), or n = 20 (Gupta and Gill 1989 ; Gupta et al 2010 ). Liu et al ( 2006 ) mentioned S. lucorum (Franch.)…”

Section: Resultsmentioning

confidence: 99%

Synotis xinningensis (Asteraceae), a new species from Hunan, China

2013

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BackgroundSynotis is one of the several genera within Senecioneae (Asteraceae) with more than 40 species that are mainly distributed in China or in the Sino-Himalayan region. During a botanical expedition in central and southwestern China in 2011, we found an unusual population of Synotis in southwestern Hunan Province. To determine the taxonomic identity of the population, we carried out gross-morphological, floral micromorphological, and cytological observations.ResultsOur gross-morphological observations have shown that the population is most similar to Synotis changiana Y. L. Chen, but readily distinguishable in the discoid capitula (vs. radiate), and in the bracts of calyculus 9–10 (vs. 6–8), 6–7 mm long (vs. 3–4 mm). The floral micromorphological observations on the population and S. changiana agree with previous reports for other species of Synotis. The chromosomes of the population are counted to be 2n = 40 + 0–1B. Its karyotype is formulated as 2n = 22m + 14sm + 4st.ConclusionsThe population is determined to represent a new species, i.e. Synotis xinningensis M. Tang & Q. E. Yang, which is described herein. The new species belongs to Synotis ser. Synotis.Electronic supplementary materialThe online version of this article (doi:10.1186/1999-3110-54-16) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Synotis xinningensis (Asteraceae), a new species from Hunan, China

2013

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“…In Parasenecio , the anther collar is usually ‘cylindrical’ without enlarged marginal basal cells and the endothecial tissue cell wall thickenings are confined to the horizontal walls and referred to as ‘polarized’ (Liu ); the chromosome number is most often n = 30 (Nakagawa , Liu ). In Synotis , the anther collar is ‘balusterform’ with enlarged marginal basal cells and the endothecial tissue cell wall thickenings are distributed along all inner walls and referred to as ‘radial’ (Jeffrey and Chen , Tang et al , , Tang and Yang ); the base chromosome number is n = 10 (Gupta and Gill , , Gupta et al ) or n = 20 (Gupta and Gill , Gupta et al , Tang et al , ).…”

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confidence: 99%

Parasenecio chenopodiifolius (Compositae–Senecioneae) is a Synotis and conspecific with S. otophylla based on evidence from morphology, cytology and ITS/ETS sequence data

Ming

Ren

Yang

2014

Nordic Journal of Botany

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Observations on living plants and herbarium specimens have convinced us that Synotis otophylla (Compositae -Senecioneae) from south Xizang (Tibet), China, must be merged with the Himalayan Parasenecio chenopodiifolius . However, is the plant a Synotis or a Parasenecio ? We have examined fl oral micro-morphological and cytological characters of P. chenopodiifolius , and performed molecular phylogenetic analyses based on ITS and ETS sequence data. Th e anther collar of this taxon is balusterform, and the endothecial tissue cell wall thickenings are radial. Th ese conform to the fl oral micro-characters of Synotis but diff er from those of Parasenecio , which has subcylindrical anther collars, and polarized endothecial tissue cell wall thickenings. Chromosome counts indicate the taxon has 2n ϭ 40, a number common in Synotis , whereas Parasenecio has 2n ϭ 60. Our phylogenetic analyses based on ITS/ETS sequences also place P. chenopodiifolius in Synotis . We make the new combination S. chenopodiifolia and synonymize S. otophylla .

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“…In addition to the chromosome number of S . baoshanensis here counted, chromosome numbers for only six species have been reported (Mehra et al 1965 ; Mehra and Remanandan 1975 ; Gupta and Gill 1981 , 1989 ; Liu et al 2006 ; Gupta et al 2010 ; Tang et al 2013 ; this study). Synotis baoshanensis , S .…”

Section: Resultsmentioning

confidence: 66%

Synotis baoshanensis (Asteraceae), a new species from Yunnan, China

Ming

Yang

2013

Bot Stud

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BackgroundSynotis (Asteraceae; Senecioneae) is a genus of about 55 species mostly distributed in the Sino-Himalayan region. During a botanical expedition in southwestern China in 2012, we found an unusual population of Synotis in southwestern Yunnan Province. To determine the taxonomic identity of the population, we carried out gross-morphological, floral micromorphological, and cytological observations.ResultsOur gross-morphological observations have shown that the population is most similar to Synotis auriculata C. Jeffrey & Y. L. Chen in leaf shape and in the number of phyllaries and florets, but readily distinguishable by the glabrous stem and petiole (vs. glandular pubescent), the exauriculate petiole (vs. auriculate), the uppermost leaves obviously smaller than the middle ones (vs. almost equally sized), and the larger ray florets (4–4.5 mm vs. ca. 2.5 mm). The floral micromorphological observations on the population agree with previous reports for other species of Synotis. The chromosomes of the population are counted to be 2n = 40. Its karyotype is formulated as 2n = 20m + 14sm + 6st.ConclusionsThe population was determined to represent a new species, i.e. Synotis baoshanensis M. Tang & Q. E. Yang, which is described herein. The species belongs to Synotis ser. Microglossae.Electronic supplementary materialThe online version of this article (doi:10.1186/1999-3110-54-17) contains supplementary material, which is available to authorized users.

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Cytological Studies in Some Members of Tribe Senecioneae (Asteraceae) from North and Central India

Cited by 10 publications

References 13 publications

Synotis xinningensis (Asteraceae), a new species from Hunan, China

Synotis xinningensis (Asteraceae), a new species from Hunan, China

Parasenecio chenopodiifolius (Compositae–Senecioneae) is a Synotis and conspecific with S. otophylla based on evidence from morphology, cytology and ITS/ETS sequence data

Synotis baoshanensis (Asteraceae), a new species from Yunnan, China

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