Cytokinins in maturing and germinatingLupinus luteus L. seeds |
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Authors: | J S Knypl D S Letham L M S Palni |
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Institution: | (1) Plant Growth Substances Laboratory, University of Lodz, ul. Banacha 12/16, PL-90-237 Lodz, Poland;(2) Research School of Biological Sciences, The Australian National University, Canberra, Australia |
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Abstract: | 3H-labelled zeatin riboside (ZR) was applied to pod walls of intactLupinus luteus L. plants. Metabolites present in mature, dry seeds were zeatin nucleotide (ZNT), zeatin riboside (ZR) and zeatin (Z), zeatin
O-glucosides and lupinic acid (LA), and the corresponding dihydro-derivatives of the cytokinins listed. Endogenous cytokinins
were rapidly metabolised in germinating seeds. In seeds labelled with 3H]ZR for 90 min following a 2 h period of imbibition in water, ZR was actively converted to ZNT and dihydro-ZNT but the prevailing
CTK was Z in cotyledons and ZR in embryo axes (EA); later LA and dihydro-LA, and O-glucoside metabolites accumulated. When
3H] zeatin was introduced into imbibing seeds, it was converted to dihydro-ZNT, ZNT, dihydro-ZR, ZR and dihydro-Z; in EA of
the Z-labelled seeds, dihydro-ZR and ZR were the main cytokinins. After incubation of the Z-labelled seeds for 6 h in water,
the ratios of dihydro-ZNT: ZNT and dihydro-ZR: ZR were, respectively, 20: 1 and 3.4: 1 in EA, and 3.5: 1 and 1.4: 1 in cotyledons. |
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