tailieunhanh - báo cáo khoa học: " DNA sequence diversity and the origin of cultivated safflower (Carthamus tinctorius L.; Asteraceae)"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: DNA sequence diversity and the origin of cultivated safflower (Carthamus tinctorius L.; Asteraceae) | BMC Plant Biology BioMed Central Research article Open Access DNA sequence diversity and the origin of cultivated safflower Carthamus tinctorius L. Asteraceae Mark A Chapman and John M Burke Address Department of Plant Biology Miller Plant Sciences Building University of Georgia Athens GA 30602 USA Email Mark A Chapman - mchapman@ John M Burke - jmburke@ Corresponding author Published 6 November 2007 Received 16 May 2007 BMC Plant Biology 2007 7 60 doi l47l-2229-7-60 Accepted 6 November 2007 This article is available from http l47l-2229 7 60 2007 Chapman and Burke licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Safflower Carthamus tinctorius L. is a diploid oilseed crop whose origin is largely unknown. Safflower is widely believed to have been domesticated over 4 000 years ago somewhere in the Fertile Crescent. Previous hypotheses regarding the origin of safflower have focused primarily on two other species from sect. Carthamus - C. oxyacanthus and C. palaestinus - as the most likely progenitors although some attention has been paid to a third species C. persicus as a possible candidate. Here we describe the results of a phylogenetic analysis of the entire section using data from seven nuclear genes. Results Single gene phylogenetic analyses indicated some reticulation or incomplete lineage sorting. However the analysis of the combined dataset revealed a close relationship between safflower and C. palaestinus. In contrast C. oxyacanthus and C. persicus appear to be more distantly related to safflower. Conclusion Based on our results we conclude that safflower is most likely derived from the wild species Carthamus palaestinus. As expected safflower .