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Key discovered to cold tolerance in corn
Date:8/29/2008

t, is made up of two parts. At low temperature these parts have been observed to fall apart, differing from the other three C4 specific enzymes. The researchers examined the DNA sequence of the gene coding for this enzyme in both plants, but could find no difference, nor could they see any difference in the behavior of the enzyme in the test tube. However, they noticed that when leaves of corn were placed in the cold, PPDK slowly disappeared in parallel with the decline in the ability of the leaf to take up carbon dioxide in photosynthesis. When Miscanthus leaves were placed in the cold, they made more PPDK and as they did so, the leaf became able to maintain photosynthesis in the cold conditions. Why?

The researchers cloned the gene for PPDK from both corn and Miscanthus into a bacterium, enabling the isolation of large quantities of this enzyme. The researchers discovered that as the enzyme was concentrated, it became resistant to the cold, thus the difference between the two plants was not the structure of the protein components but rather the amount of protein present.

The findings suggest that modifying corn to synthesize more PPDK during cold weather could allow corn, like Miscanthus, to be cultivated in colder climates and be productive for more months of the year in its current locations. The same approach might even be used with sugar cane, which may be crossed with Miscanthus, making improvement of cold-tolerance by breeding a possibility.


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Contact: Steve Long
slong@uiuc.edu
217-766-6570
American Society of Plant Biologists
Source:Eurekalert

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