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Abstract Detail


Evolution of Development and Physiology

Coate, Jeremy E. [1], Maureira Butler, Ivan J. [2], Owens, Thomas G. [3], Doyle, Jeff J. [3].

Allopolyploidy generates novel photosynthesis-related phenotypes in wild relatives of soybean (Glycine subgenus Glycine).

Polyploidy is a dominant force in plant evolution, and in some cases polyploids are more successful than their diploid progenitors. Photosynthesis plays a fundamental role in plant fitness, and is a prime example of how polyploids can differ dramatically from their diploid progenitors. We are investigating the effects of allopolyploidy on photosynthesis in synthetic and natural allotetraploids of Glycine subgenus Glycine, wild relatives of the cultivated soybean (G. max). Using chlorophyll fluorescence and gas exchange methods, we show that allopolyploidy has induced a number of novel phenotypes relating to photosynthetic capacity, non-photochemical quenching capacity (NPQmax), and the response of quantum yield of photosystem II (ΦPSII) to chilling stress. These data suggest that 1) independent allopolyploid events involving very similar parents can produce a wide range of transgressive phenotypes; 2) dramatic changes in photosynthesis can occur immediately after allopolyploidization in synthetic allopolyploids; and 3) these changes persist over evolutionary time in natural allopolyploids. Because subgenus Glycine includes several related but distinct allopolyploid species, we can begin to dissect the various underlying factors that facilitate or constrain these responses (e.g., genetic breadth of cross, chloroplast donor), and to determine if observed responses are driven by hybridization, genome duplication, or some combination of the two.


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1 - Cornell University, Plant Biology, 228 Plant Science Building, Ithaca, NY, 14853, USA
2 - Agro Aquaculture Nutritional Genomic Center
3 - Cornell University, Plant Biology

Keywords:
Allopolyploidy
Photosynthesis
Glycine.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P27015
Abstract ID:2029


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