| Abstract Detail
Land Plant Evolution: Phylogenetics and Beyond Niklas, Karl J. [1]. Early land plant evolution: A biophysical perspective. THE first successful land plants evolved the ability to survive in an aerial environment by reconciling the conflicting biological requirements for light interception, liquid mass-transport, mechanical support, and gas/energy exchange with the ambient environment (while simultaneously conserving water and regulating body heat). Theoretically, the performance of each of these biological functions can be maximized. However, a biophysical ("first principles") perspective on how all of these functions can be performed simultaneously identifies only two basic body-forms that are capable of optimization (i.e., cylinders and oblate spheroids), which are also functionally compatible with the "schizophrenic" reproductive obligations of the ancient embryophyte life-cycle (i.e., aerial meiospore dispersal and flagellated sperm survival). A biophysical perspective also shows that increases in body size of either of these two basic body-forms is either vegetatively or reproductively adaptive, but that it requires morphological or anatomical restructuring or specialization. Many if not all of the trends predicted by a "first principles" perspective on early land plant evolution are consistent with what it currently known about the fossil record of the most ancient embryophyte lineages. Log in to add this item to your schedule
1 - Cornell University, Department of Plant Biology, Ithaca, New York, 14853, (USA)
Keywords: biomechanics plant evolution allometry.
Presentation Type: Symposium or Colloquium Presentation Session: 20-7 Location: 170/Holt Date: Monday, July 31st, 2006 Time: 3:15 PM Abstract ID:231 |