Biotic and abiotic stress effects on nitrogen chemistry in the salt marsh cordgrassSpartina alterniflora (Poaceae) |
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Authors: | John D. Bacheller John T. Romeo |
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Affiliation: | (1) Department of Biology, University of South Florida, 33620-5150 Tampa, Florida, USA;(2) Present address: Department of Biology, UCLA, 90024-1606 Los Angeles, California, USA |
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Abstract: | Summary Planthopper (Insecta: Homoptera) feeding stress induces a senesence-like response in the leaves ofSpartina alterniflora characterized by decreased soluble protein, an increased total amino acid pool, and elevated levels of 10 individual amino acids. Increased proline and tryptophan in response to planthopper feeding could not be fully explained by protein degradation. Low degrees of soil salinity stress resulted in an increased total free amino acid pool and elevated levels of 7 amino acids. Anaerobic soil stress resulted in decreased glutamic acid and increased asparagine. Low salinity and anaerobic stress had no effect on soluble protein levels. Glycinebetaine was not affected by the stresses examined in this study. |
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Keywords: | abiotic stress biotic stress glycinebetaine halophyte osmoregulation planthoppers salt marsh senesence Poales Poaceae Spartina alterniflora Homoptera Delphacidae Prokelisia dolus P. marginata |
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