Natural hybridization origin of Rhododendron agastum (Ericaceae) in Yunnan, China: inferred from morphological and molecular evidence

Zhang, Jingli; Zhang, Changqin; Gao, Lian‐Ming; Yang, Jun‐Bo; Li, Hongtao

doi:10.1007/s10265-007-0076-1

Cited by 44 publications

(51 citation statements)

References 25 publications

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“…Interestingly, analysis of the nucleotide additive patterns of these putative hybrid samples revealed that they were likely to have arisen from the combination between the individual sequences of the STEL Type A and the STEL Type B at most nucleotide additive sites. These results of ITS nucleotide additive sequences in C. stellatopilosus were similar to those of previous reports on the hybridization of Paeonia [11] and Rhododendron agastum [12]. Based on the appearance of two individual and the additive nucleotides of the obtained ITS sequences, we propose that hybridization of the two types occurred in C. stellatopilosus species.…”

Section: Resultssupporting

confidence: 91%

Genetic variation of Croton stellatopilosus Ohba based on non-coding DNA sequences of ITS, trnK and trnL-F regions

et al. 2011

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Croton stellatopilosus Ohba (Plau-noi), a well-known Thai medicinal plant, was investigated for its genetic variation by analyzing three DNA regions, one nuclear internal transcribed spacer (ITS) region and two chloroplast trnL-F intergenic spacer and trnK intron regions. The results of ITS sequencing from 30 leaf samples showed that there were two major genotypes of C. stellatopilosus which were designated as STEL Type A and B. In addition, various nucleotide additive sequences which had presumably arisen from these two groups were also found. These so-called "putative hybrids", interestingly, displayed trnK intron sequences identical to the STEL Type B but different from the Type A. For the trnL-F region, all the 30 samples showed identical sequences. Thus, it was suggested that in the hybridization of C. stellatopilosus, the Type A genotype acts as paternal parent whereas the Type B genotype acts as maternal parent. In addition, all C. stellatopilosus samples were analyzed for their plaunotol content using TLC densitometry. We found that the Type A genotype, hybrid group and Type B genotype had plaunotol content in the ranges 0.209-0.492, 0.319-0.896 and 0.442-1.000% (w/w) dry weight, respectively. The results indicated that there is a correlation between the plaunotol contents and non-coding DNA sequences of ITS, trnK and trnL-F regions of C. stellatopilosus.

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Section: Resultssupporting

confidence: 91%

Genetic variation of Croton stellatopilosus Ohba based on non-coding DNA sequences of ITS, trnK and trnL-F regions

et al. 2011

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“…However, homoploid hybridization is more difficult to recognize than hybridization accompanying polyploidization (Grant 1981;Ferguson and Sang 2001). Several cases of natural homoploid hybridization have been demonstrably proved by the phylogenetic method and most are referred to as diploid (e.g., Rieseberg 1995;Howarth and Baum 2005;Pan et al 2007;Yamaji et al 2007;Zhang et al 2007). To date, tetra-homoploid hybridizations have been found in a few species (Ferguson and Sang 2001;Nagamitsu et al 2006).…”

Section: Introductionmentioning

confidence: 96%

Reticulate hybridization of Alpinia (Zingiberaceae) in Taiwan

Liu

Wang

2009

J Plant Res

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Reticulate hybridization is a complicated and creative mechanism in plant evolution that can cause interference in phylogenetic studies. Based on observations of intermediate morphology, low pollen fertility, and overlapping distributions of putative parent species, Yang and Wang (Proceedings of the cross-strait symposium on floristic diversity and conservation. National Museum of Natural Science, Taichung, Taiwan, pp 183-197, 1998) first proposed reticulate hybridization of Alpinia in Taiwan. In the present study, molecular tools were used to explore relationships between four parental species and their homoploidy hybrids, and the impact of hybridization on phylogeny reconstruction. Based on DNA markers, maternal heritance of the chloroplast genome, and additivity of nuclear ribosomal internal transcribed spacer, the present results provide strong support for the hybridization hypothesis. Co-existence of parental ribotypes within hybrids revealed that these hybridization events were current, while reciprocal and introgressive hybridization were inferred from chloroplast DNA data. Furthermore, iterative hybridizations involving more than two parental species may occur in notorious hybrid zones. Ecological, phenological, and physiological evidence provides insight into why such frequent hybridization occurs in Taiwanese Alpinia. In the phylogenetic tree of the Zerumbet clade reconstructed in this study, the chloroplast sequences from one hybrid species were not grouped into a subclade, implying instability caused by hybridization. Failure to find morphological apomorphies and biogeographical patterns in this clade was likely partially due to reticulate hybridization.

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“…delavayi ), and suggested R. decorum was the other parent. While it is true that an artificial hybrid of these two species does exhibit certain morphological similarities with ‘ R. agastum ’ (Zhang et al 2007; Zha et al. 2008), further genetic and morphological work showed convincingly that it is a hybrid of R. delavayi and R. irroratum (Zha et al 2010).…”

Section: Methodsmentioning

confidence: 99%

“…That hybridization occurs frequently in Rhododendron is well-accepted and extensive evidence of natural hybrid formation can be found across the genus (Kron 1997; Milne et al 2003; Zhang et al 2007; Milne and Abbott 2008; Zha et al 2008; Marczewski et al 2015). Moreover, hybrids can occur between species in different subsections [e.g.…”

Section: Introductionmentioning

confidence: 94%

Why is population information crucial for taxonomy? A case study involving a hybrid swarm and related varieties

Marczewski

Zhang

et al. 2015

AoB PLANTS

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Despite acceptance in the scientific community that population information and suites of characters are crucial for circumscription of taxonomic groups, new taxa continue to be published on the basis of few herbarium specimens. Given that there is increasing evidence that hybridisation plays an integral part in evolution, it is desirable to identify groups in which it occurs. In this study, we showcase how population variation can be used to identify distinguishing characters and why closely related species that are growing in sympatry should be considered when describing new taxonomic entities.

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Natural hybridization origin of Rhododendron agastum (Ericaceae) in Yunnan, China: inferred from morphological and molecular evidence

Cited by 44 publications

References 25 publications

Genetic variation of Croton stellatopilosus Ohba based on non-coding DNA sequences of ITS, trnK and trnL-F regions

Genetic variation of Croton stellatopilosus Ohba based on non-coding DNA sequences of ITS, trnK and trnL-F regions

Reticulate hybridization of Alpinia (Zingiberaceae) in Taiwan

Why is population information crucial for taxonomy? A case study involving a hybrid swarm and related varieties

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