Distribution and Redistribution of Molybdenum in B

Authors: Jongruaysup S Dell B Bell R W

Publish Date: 1994/02/01

Volume: 73, Issue: 2, Pages: 161-167

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Abstract

S Jongruaysup B Dell R W Bell Distribution and Redistribution of Molybdenum in Black Gram Vigna mungo L Hepper in Relation to Molybdenum Supply Annals of Botany Volume 73 Issue 2 February 1994 Pages 161–167 https//doiorg/101006/anbo19941019The effect of seven rates of molybdenum Mo supply on the distribution and redistribution of Mo in Vigna mungo black gram cv Regur on a Modeficient sandy loam was examined from flower bud appearance to pod set in one experiment and during pod filling to maturity in anotherAt the three lowest Mo supply rates N deficiency symptoms typical of Mo deficiency appeared and shoot dry matter and shoot nitrogen content were depressed Increasing Mo supply increased Mo concentrations in all plant parts but the response varied with Mo supply and with plant part In leaf blades and petioles Mo concentrations increased slightly when the Mo supply increased from severely deficient to deficient levels but further increases in Mo supply markedly increased the Mo concentrations particularly in immature and recently matured leaves In petioles Mo concentrations generally exceeded those in the blades which they supported at all levels of Mo supply At Mo rates greater than that required for maximum growth Mo concentrations in basal stem segments exceeded those in petioles Molybdenum concentrations in nodules exceeded those in above ground plant parts except at the highest level of Mo supply where the concentrations in basal stem segments exceeded those in nodulesIn Moadequate plants Mo contents in the trifoliolate leaves decreased with time suggesting that Mo was readily remobilized By contrast in stem segments at all levels of Mo supply and in trifoliolate leaves in Modeficient plants Mo contents remained constant or increased with time suggesting that Mo was not remobilized in all plant parts or at all levels of Mo supply Thus the results suggest that in black gram Mo was variably mobile being phloem immobile at low Mo supply but phloemmobile in all plant parts with the possible exception of stem segments at adequate Mo supply The relevance of these results for the development of plant tests for Mo deficiency diagnosis is discussedCopyright 1994 1999 Academic Press

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