Selenium as a novel regulator of porphyrin biosynthesis in germinating seedlings of mung bean (Phaseolus vulgaris).
5-Aminolevulinic acid, porphyrin and chlorophyll contents as well the activities of 5-aminolevulinic acid dehydratase and PBG deaminase were studied in selenium treated mung bean seedlings. Selenium had no effect on 5-aminolevulinic acid synthetic ability but inhibited 5-aminolevulinic acid dehydratase and PBG deaminase activities. Further, it was observed that selenium induced accumulation of protoporphyrin-IX and Mg-protoporphyrin ester and decreased chlorophyll levels in both light and dark-grown seedlings. The results suggest the possible regulatory role of selenium on chlorophyll synthesis by interacting with sulfhydryl containing enzymes 5-aminolevulinic acid dehydratase and porphobilinogen deaminase.
Padmaja
K
K
Department of Biochemistry, Sri Venkateswara University, Tirupathi, Andhra Pradesh, India.
Prasad
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DD
Prasad
A R
AR
D000622:Aminolevulinic Acid / Q000378:metabolism*; D002734:Chlorophyll / Q000096:biosynthesis*; D007887:Fabaceae / Q000378:metabolism*; D011163:Hydroxymethylbilane Synthase / Q000378:metabolism; D010946:Plants, Medicinal; D000623:Porphobilinogen Synthase / Q000378:metabolism; D011166:Porphyrins / Q000096:biosynthesis*; D012643:Selenium / Q000502:physiology*
D011166:Porphyrins; D002734:Chlorophyll; D000622:Aminolevulinic Acid; D011163:Hydroxymethylbilane Synthase; D000623:Porphobilinogen Synthase; D012643:Selenium