کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4503099 1320843 2007 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photosynthesis research on yellowtops: Macroevolution in progress
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات مدل‌سازی و شبیه سازی
پیش نمایش صفحه اول مقاله
Photosynthesis research on yellowtops: Macroevolution in progress
چکیده انگلیسی
The vast majority of angiosperms, including most of the agronomically important crop plants (wheat, etc.), assimilate CO2 through the inefficient C3 pathway of photosynthesis. Under ambient conditions these organisms loose about 1/3 of fixed carbon via photorespiration, an energetically wasteful process. Plants with C4 photosynthesis (such as maize) eliminate photorespiration via a biochemical CO2-pump and thus have a larger rate of carbon gain. The genus Flaveria (yellowtops, Asteraceae) contains not only C3 and C4 species, but also many C3-C4 intermediates, which have been interpreted as evolving from C3 to fully expressed C4 metabolism. However, the evolutionary significance of C3-C4Flaveria-intermediates has long been a matter of debate. A well-resolved phylogeny of nearly all Flaveria species has recently been published. Here, we review pertinent background information and combine this novel phylogeny with physiological data. We conclude that the Flaveria species complex provides a robust model system for the study of the transition from C3 to C4 photosynthesis, which is arguably a macroevolutionary event. We conclude with comments relevant to the current Intelligent Design debate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theory in Biosciences - Volume 125, Issue 2, 20 April 2007, Pages 81-92
نویسندگان
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