Polyploidy in Aconitum subgenus Lycoctonum (Ranunculaceae)

Yuan, Qiong; Yang, Qin‐Er

doi:10.1111/j.1095-8339.2006.00468.x

Cited by 20 publications

(33 citation statements)

References 5 publications

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“…In the Himalaya–Hengduan Mountains region, limited biogeographic studies manifested that diploid and derivative polyploids colonizing different distribution areas (Liang et al, 2015; Wu et al, 2016), with some polyploids tending to occur at high altitudes, such as Aconitum (Yuan and Yang, 2006), Allium przewalskianum (Cui et al, 2008), and Anaphalis nepalensis (Meng et al, 2014). Although geographical segregation of cytotypes has long been recognized, the underlying mechanisms creating these patterns remain poorly understood (McIntyre, 2012).…”

Section: Discussionmentioning

confidence: 99%

Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

et al. 2016

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Polyploid species generally occupy harsher habitats (characterized by cold, drought and/or high altitude) than diploids, but the converse was observed for Chamerion angustifolium, in which diploid plants generally inhabit higher altitudes than their polyploid derivatives. Plants at high altitudes may experience cold-induced water stress, and we therefore examined the physiological responses of diploid and hexaploid C. angustifolium to water stress to better understand the ecological differentiation of plants with different ploidy levels. We conducted a common garden experiment by subjecting seedlings of different ploidy levels to low, moderate, and severe water stress. Fourteen indicators of physiological fitness were measured, and the anatomical characteristics of the leaves of each cytotype were determined. Both cytotypes were influenced by drought, and diploids exhibited higher fitness in terms of constant root:shoot ratio (R:S ratio) and maximum quantum yield of PS II (Fv/Fm), less reduced maximal photosynthetic rate (Amax), transpiration rate (E), intercellular CO2 concentration (Ci) and stomatal conductance (gs), and higher long-term water use efficiency (WUEL) under severe water stress than did hexaploids. Analysis of leaf anatomy revealed morphological adjustments for tolerating water deficiency in diploids, in the form of closely packed mesophyll cells and small conduits in the midvein. Our results indicate that diploid C. angustifolium is more tolerant of drought than hexaploid plants, ensuring the successful survival of the diploid at high altitudes. This eco-physiological divergence may facilitate the species with different cytotypes to colonize new and large geographic ranges with heterogeneous environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

et al. 2016

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“…Peterm. (Yuan and Yang, 2006), Rheum (Liu et al, 2010), and Anaphalis (Meng et al, 2010). Wu et al (2010) suggested that the tetraploid cytotypes of Allium przewalskianum Regel had evolutionary advantages over diploids in colonizing and/or surviving the arid habitats of the QTP.…”

Section: Mechanisms Of Species Diversification On the Qtpmentioning

confidence: 99%

Evolutionary diversifications of plants on the Qinghai-Tibetan Plateau

et al. 2014

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The Qinghai-Tibetan Plateau (QTP) is the highest and one of the most extensive plateaus in the world. Phylogenetic, phylogeographic, and ecological studies support plant diversifications on the QTP through multiple mechanisms such as allopatric speciation via geographic isolation, climatic oscillations and divergences, pollinator-mediated isolation, diploid hybridization and introgression, and allopolyploidy. These mechanisms have driven spectacular radiations and/or species diversifications in various groups of plants such as Pedicularis L., Saussurea DC., Rhododendron L., Primula L., Meconopsis Vig., Rhodiola L., and many lineages of gymnosperms. Nevertheless, much work is needed toward understanding the evolutionary mechanisms of plant diversifications on the QTP. Well-sampled biogeographic analyses of the QTP plants in the broad framework of the Northern Hemisphere as well as the Southern Hemisphere are still relatively few and should be encouraged in the next decade. This paper reviews recent evidence from phylogenetic and biogeographic studies in plants, in the context of rapid radiations, mechanisms of species diversifications on the QTP, and the biogeographic significance of the QTP in the broader context of both the Northern and Southern Hemisphere biogeography. Integrative multidimensional analyses of phylogeny, morphological innovations, geography, ecology, development, species interactions and diversifications, and geology are needed and should shed insights into the patterns of evolutionary assembly and radiations in this fascinating region.

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“…It seems that polyploidy has played a relatively important role in the chromosome evolution of Anaphalis from the Qinghai‐Tibet Plateau, although this point of view is not supported by statistical analysis of the chromosome numbers of 552 taxa from the Hengduan Mountains of southwest China (Nie et al, 2005). Some chromosome studies of highly diversified genera in the region indicated low frequency of polyploids, e.g., Cremanthodium (Liu et al, 2001), Ligularia (Liu, 2004), Tibetia (Nie et al, 2002), and Delphinium (Yuan & Yang, 2008), others show that polyploids are common, e.g., Aconitum subgenus Lycoctonum (Yuan & Yang, 2006) and Buddleja (Chen et al, 2007). It is too early to conclude that polyploidy or diploidy is relatively more important.…”

Section: Discussionmentioning

confidence: 99%

Polyploidy and new chromosome counts in Anaphalis (Asteraceae: Gnaphalieae) from the Qinghai‐Tibet Plateau of China

Meng

Sun

Yang

et al. 2010

J of Sytematics Evolution

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Anaphalis is one of the largest genera of the Asian Gnaphalieae (Asteraceae) and is most diversified on the Qinghai‐Tibet Plateau. The chromosome numbers and karyomorphology of six species from seven populations were investigated for the first time for this region. Chromosome numbers have been newly documented for four species: Anaphalis deserti (2n = 56 = 24 median [m]+ 24 submedian [sm]+ 8 acrocentric [st]); Anaphalis plicata (2n = 56 = 26m + 30sm); Anaphalis xylorhiza (2n = 28 = 2 median point [M]+ 14m + 12sm); and Anaphalis rhododactyla (2n = 56 = 32m + 24sm). Two further counts are in agreement with the previously reported numbers, that is, Anaphalis royleana (2n = 28 = 4M + 6m + 18sm) and Anaphalis margaritacea (2n = 28 = 12m + 16sm). A new polyploid cytotype (2n = 56 = 26m + 30sm) was found in the Zougong population of A. margaritacea. Polyploidy is for the first time reported for Anaphalis, with four out of seven counts being tetraploid. Our cytological results suggest that polyploids might have played an important role in the evolution of Anaphalis on the Qinghai‐Tibet Plateau.

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Polyploidy in Aconitum subgenus Lycoctonum (Ranunculaceae)

Cited by 20 publications

References 5 publications

Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya–Hengduan Mountains Region

Evolutionary diversifications of plants on the Qinghai-Tibetan Plateau

Polyploidy and new chromosome counts in Anaphalis (Asteraceae: Gnaphalieae) from the Qinghai‐Tibet Plateau of China

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