Functional Plant Science and Biotechnology ©2007 Global Science Books Apomixis in the Asteraceae: Diamonds in the Rough Richard D. Noyes University of Central Arkansas, Conway, Arkansas 72035, USA Correspondence :
[email protected] ABSTRACT The Asteraceae is commonly listed, along with Poaceae and Rosaceae, as one of the principal families within which asexual reproduction by seed, i.e., apomixis, is prolific. A review of the literature indicates that naturally occurring apomixis is robustly indicated for 22 genera in seven tribes of Asteraceae (Lactuceae, Gnaphalieae, Astereae, Inuleae, Heliantheae, Madieae, and Eupatorieae), all but one of which occurs in the subfamily Asteroideae. Apomixis has been proposed for an additional 46 genera. However, consideration of the evidence indicates that the trait is contra-indicated for 30 of these cases in which developmental abnormalities or components of apomixis are recorded for otherwise sexual taxa. Accumulation and perpetuation of these reports through generations of reviews has inflated the actual number of genera in which apomictic reproduction occurs in the family. Data are strongly indicative or equivocal for effective apomixis for the remaining 16 genera, but thorough documentation is wanting. Our state of knowledge of apomixis in the Asteraceae is generally poor. Interpreting the phylogenetic distribution and evolution of the trait in the family will require systematic effort involving cytological documentation and genetic analysis of reproduction for many candidate genera. _____________________________________________________________________________________________________________