Sexual hybrids of Tanacetum: biochemical, cytological and pharmacological characterization

Parthenolide and abscisic acid synthesis in feverfew are associated but environmental factors affect them dissimilarly

“…The increase of trichomes in water-stressed plants seem to constitute an important morphological mechanism to maintain phothosyntetic activity (Morales et al, 2002). It has been suggested that PRT is mainly present in the trichomes (Blakeman and Atkinson, 1979;Awang et al, 1991;Brown et al, 1999), which agrees with our observation that water stress increased PRT levels. Moreover, changes in the level of metabolites in trichomes, as a response of the plant to changes in the environment, have previously been reported (Kimura et al, 2000).…”

New chromosome counts in some species of Asteraceae from Iran

“…It seems that this species is not homogenous and our embryological studies indicated there is both zygotic and somatic embryogenesis (unpubl.). These events can be regarded as a sign of ongoing speciation (Brown et al 1999, Sheidai and Attaei 2005).…”

“…Several counts have been carried out on different wild population of this species, giving the chromosome number as 2n=2x=18 (Ferkova 1976Ferakova 1978, Strid and Franzén 1981Strid and Farzan 1983, Kuzmanov et al 1986, Bruhl 1990, Pastor et al 1990, Baltisberger 1993, Dempsey et al 1994, Brown et al 1999). Our results are a confirmation of above mentioned reports.…”

Karyological studies of some representatives of Tanacetum L. (Anthemideae-Asteraceae) from north-east Anatolia

“…The available literature from other parts of the world dealing with cytogenetics of Tanacetum indicates the importance of such studies (Brown et al 1999;Baltisberger 2006;Li et al 2008). However, nearly all cytological studies of the genus have focused solely on determination of chromosome numbers.…”