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Full-Text Articles in Life Sciences
Influence Of Endomycorrhizae On Growth Of Sweetgum Seedlings From Eight Mother Trees, Richard C. Schultz, Paul P. Kormanik, William C. Bryan
Influence Of Endomycorrhizae On Growth Of Sweetgum Seedlings From Eight Mother Trees, Richard C. Schultz, Paul P. Kormanik, William C. Bryan
Richard C. Schultz
Sweetgum seedlings from eight mother trees were grown in fumigated soil with or without the endomycorrhizal fungus Glomus mosseae at four levels of soil fertility for one growing season in nursery microplots. Nonmycorrhizal seedlings of all families died or failed to exceed 5 cm in height regardless of soil fertility. Endomycorrhizal seedlings suffered little mortality, averaged about 36 cm in height, and fertility level did not significantly influence their biomass. These results demonstrate that to increase the percentage of plantable seedlings in nurseries sweetgum seedlings must be endomycorrhizal. The data further suggests that adequate endomycorrhizal inoculum in nursery beds can …
Metabolic Regulation Of Glycolate Synthesis, Photorespiration, And Net Photosynthesis In Tobacco By L-Glutamate, David J. Oliver, Israel Zelitch
Metabolic Regulation Of Glycolate Synthesis, Photorespiration, And Net Photosynthesis In Tobacco By L-Glutamate, David J. Oliver, Israel Zelitch
David J. Oliver
Experiments were undertaken to identify and characterize control mechanisms in tobacco leaf tissue which decrease the relative contribution of photorespiratory CO2 release and thereby increase net photosynthetic CO2 fixation. A number of metabolites were supplied to illuminated leaf discs and their effect on the inhibition of glycolate synthesis was measured. Glycolate accumulation, in the presence of α-hydroxy-2-pyridinemethanesulfonic acid, was inhibited in leaf discs previously floated on 30 mM solutions of either L-glutamate, L-aspartate, phospho-enolpyruvate, or glyoxylate. The effect of glutamate on glycolate synthesis, which was investigated in detail, was concentration- and time-dependent. Glycolate synthesis was inhibited about 40% by treating …