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First Report of Spotted Knapweed (Centaurea maculosa) Stem Dieback Caused by Pseudomonas syringae.

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In June and July of 1995, stems of spotted knapweed (Centaurea maculosa) displayed dieback at two field locations near Bozeman, MT. Dieback developed after plant bolting and during apical bud development. Seedlings and plants in the rosette stage were not affected. Symptoms included curling of stems

CcMYB6-1 and CcbHLH1, two novel transcription factors synergistically involved in regulating anthocyanin biosynthesis in cornflower.

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Anthocyanins in cornflower (Centaurea cyanus) is catalysed by a set of biosynthesis genes, however, the potential mechanism of transcriptional regulation remains unclear. In the present study, we traced the dynamic changes of petal colour development from white to violet and finally to blue on the

Inhibition of tomato bushy stunt virus infection using a quercetagetin flavonoid isolated from Centaurea rupestris L.

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Flower and leaf extracts of Centaurea rupestris L. and also the flavonoid quercetagetin 3'-methylether isolated from these extracts revealed a strong antiviral activity when inoculated simultaneously with tomato bushy stunt virus in two Nicotiana species. Almost complete reduction of local lesion

Biological monitoring of ozone: the twenty-year Italian experience.

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Tropospheric ozone is a growing environmental menace in Italy and in the whole Mediterranean basin. The importance of active biomonitoring of this pollutant with hypersensitive Bel-W3 tobacco plants is stressed, and several examples of field studies carried out in Italy with this technique are

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