Glutamine Synthetase Isoenzymes of Striga hermonthica and other Angiosperm Root Parasites |
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Authors: | McNALLY, SHEILA F. OREBAMJO, T. O. HIREL, B. STEWART, G. R. |
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Abstract: | The occurrence of multiple forms of glutamine synthetase inStriga hermonthica and other angiosperm root parasites was investigated.The facultative chlorophyllous parasite Melampyrum arvense exhibitedtwo isoenzymes in leaf tissue, the cytosolic component (GS1)comprised less than 30% of total glutamine synthetase. In contrastGS1 was the major component (<70%) in photosynthetic tissueof Striga hermonthica and S. gesnerioides. Only a single isoenzyme(GS1) was detectable in the achlorophyllous root parasites Orobancheand Lathraea and in non-photosynthetic tissue of S. gesnerioides.The kinetic and physical properties of GS1 and GS2 of theseangiosperm parasites were similar to those of the isoenzymesin other non-parasitic angiosperms. Key words: Glutamine synthetase, Angiosperms, Root parasites |
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