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Potential refugia in Qinghai-Tibetan Plateau revealed by the phylogeographical study of Swertia tetraptera (Gentianaceae)

100%

Yang L.-C., Zhou G.-Y., Li C.-L., Song W.-Z., Chen G.-C.

Polish Journal of Ecology

2011

tom 59

nr 4

We studied the phylogeography of Swertia tetraptera Maxim, which is an annual herbaceous plant endemic to the Qinghai-Tibetan Plateau (QTP), by sequencing one intergenic chloroplast spacer, trnL-trnF (773 bp). The sampling design included 35 populations and 399 individuals, and spanned the entire distribution of the species. Forty-four haplotypes were characterized, and one of them was widely distributed in all of the populations. The level of differentiation among the populations studied was relatively low (GST = 0.128). Estimates of NST -GST for populations of S. tetraptera indicated that no phylogeographical structure exists, which was supported by the distribution of haplotypes. The neutrality test, mismatch distribution and a ‘star-like’ genealogy all suggested that this species experienced population expansion. According to the number of rare haplotype and geological evidence, this study suggested that two potential refugia existed during the last glaciation: the first refugium was identified in a restricted semi-continuous area around the eastern margin of the plateau; the second refugium was located in the central of QTP. In fact, the findings of our study are somewhat similar as the third phylogeographical structure occurring in the QTP, that is, alpine plants have refugia not only in the edge area but also in the Plateau platform. However, the location of plateau edge and plateau platform refugia is very different among them due to the difference of species-specific characteristic such as distributional range and life history traits.

Anthocyanins accumulate in tartary buckwheat (Fagopyrum tataricum) sprout in response to cold stress

86%

Li S.-J., Bai Y.-C., Li C.-L., Yao H.-P., Chen H., Zhao H.-X., Wu Q.

Acta Physiologiae Plantarum

2015

tom 37

nr 08

Tartary buckwheat (Fagopyrum tataricum) is rich in flavonoids. Anthocyanins, a special class of flavonoids, offer significant nutrients and provide the red pigment found in sprouts. The anthocyanins biosynthesis has been shown influenced by environmental stress. In this study, we investigate the effects of cold stress on anthocyanins biosynthesis of tartary buckwheat sprouts. On cellular level, cross-sectional observations were performed and result indicated that anthocyanins accumulated primarily in the epidermal and cortex cells of hypocotyls. Biochemical analysis, including anthocyanin quantification, thin-layer chromatography and radical scavenging assay, showed that cold stress significantly increased the synthesis of anthocyanins and antioxidant activity of tartary buckwheat sprouts. At the molecular level, semi-RTPCR was used to investigate 14 anthocyanin-related genes in tartary buckwheat sprouts treated with cold stress. All the selected genes were upregulated in cold-stressed sprouts, except for FtGST, FtAHA, and FtMYB. More importantly, the expression level of three late biosynthesis genes, FtF30H, FtDFR, and FtANS, was highest in hypocotyl tissue. Our results suggest that anthocyanins play a considerable role in the cold stress tolerance of tartary buckwheat sprouts.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Polish Journal of Ecology

2 Li C.-L.

1 Bai Y.-C.

1 Chen G.-C.

1 Chen H.

1 Li S.-J.

1 Song W.-Z.

1 Wu Q.

1 Yang L.-C.

1 Yao H.-P.

1 Zhao H.-X.

1 Zhou G.-Y.

1 2015

1 2011

Wyniki wyszukiwania

Potential refugia in Qinghai-Tibetan Plateau revealed by the phylogeographical study of Swertia tetraptera (Gentianaceae)

Anthocyanins accumulate in tartary buckwheat (Fagopyrum tataricum) sprout in response to cold stress