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Review
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Phylogeny of
Artemisia L.: Recent developments
Muhammad
Qasim Hayat1, Muhammad Ashraf1, Mir
Ajab Khan1, Tariq Mahmood1*, Mushtaq
Ahmad1 and Shazia Jabeen2
1Department
of Plant Sciences, Quaid-i-Azam University, Islamabad,
Pakistan.
2National
Center of Excellence in Geology, University of Peshawar,
Peshawar, Pakistan.
*Corresponding author. E-mail:
taariq.mahmood@yahoo.com.
Accepted 27 March, 2009 |
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Abstract |
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In this review, classification and phylogeny of genus
Artemisia L. is discussed. Its centers of
diversity lie in the temperate and cold temperate regions of
the Eurasia, North America and Asia. Artemisia has
two basic chromosome numbers, with ploidy levels x=9 and
x=8. Chromosome number in diploid is most often 2n=18 or 16.
The genus is divided into five large groups Absinthium
DC., Artemisia L., Dracunculus Besser,
Seriphidium Besser and Tridantatae (Rydb.)
McArthur. Its phylogeny was based on the two hypothesized
evolutionary trends, loss of fertility in the disc florets
and loss of ray florets. Recently its molecular phylogeny
based on internally transcribed spacer (ITS), externally
transcribed spacer (ETS) regions of the DNA and chloroplast
DNA suggested that the genus Artemisia is a
monophyletic but it could not resolve the problem of
infra-generic classification. This study revealed that there
is need to search new genome regions to establish a natural
classification based on modern molecular techniques.
Key words:
Artemisia, phylogeny, pollen, polyploidy. |
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