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Influence of Phosphorus and Potassium on Alfalfa Yield, Taproot C and N Pools, and Transcript Levels of Key Genes after Defoliation

Berg, W.K ; Cunningham, S.M ; Brouder, S.M ; Joern, B.C ; Johnson, K.D ; Volenec, J.J

Crop science, 2009-05, Vol.49 (3), p.974-982 [Periódico revisado por pares]

Madison: Crop Science Society of America

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  • Título:
    Influence of Phosphorus and Potassium on Alfalfa Yield, Taproot C and N Pools, and Transcript Levels of Key Genes after Defoliation
  • Autor: Berg, W.K ; Cunningham, S.M ; Brouder, S.M ; Joern, B.C ; Johnson, K.D ; Volenec, J.J
  • Assuntos: alfalfa ; beta-amylase ; carbon ; crop yield ; defoliation ; Fertility ; forage crops ; Gene expression ; genes ; Medicago sativa ; messenger RNA ; Molecular weight ; nitrogen ; nutrient availability ; nutrient reserves ; phosphorus ; plant nutrition ; potassium ; roots ; seasonal variation ; storage proteins ; Studies ; Sucrose ; sucrose synthase ; translocation (plant physiology) ; yield components
  • É parte de: Crop science, 2009-05, Vol.49 (3), p.974-982
  • Notas: http://dx.doi.org/10.2135/cropsci2008.07.0395
    All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.
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  • Descrição: Fertilization with K and P impacts alfalfa (Medicago sativa L.) yield, but how these nutrients influence taproot reserves and gene expression is unknown. Our objectives were to determine how P and K impact (i) alfalfa yield and yield components, (ii) accumulation and use of taproot carbon (C) and nitrogen (N) pools, and (iii) transcript levels for β-amylase, sucrose synthase, and the high molecular weight vegetative storage protein in alfalfa taproots. Yield and yield components were determined at 30-d intervals beginning in late May. Roots were sampled after the late June harvest (Day 0) and 1, 3, 6, 10, 14, 21, and 30 d thereafter. Addition of P and K increased forage yield by enhancing mass per shoot. High P resulted in rapid starch use, while taproots of plants fertilized with K had low sugar concentrations. Transcripts decline by Day 6 and by Day 10 were below detection limits. Transcripts for β-amylase and sucrose synthase accumulated rapidly after Day 10 in taproots of plants fertilized with both P and K. Balanced P and K nutrition resulted in the accumulation and effective utilization of C and N reserves and in improved alfalfa adaptation to defoliation.
  • Editor: Madison: Crop Science Society of America
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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