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Acta Physiologiae Plantarum

, 41:150 | Cite as

Leaf protein allocation across the canopy and during senescence in earlier and later senescing maize hybrids, and implications for the use of chlorophyll as a proxy of leaf N

  • Mariana AntoniettaEmail author
  • Paula Girón
  • María L. Costa
  • Juan J. Guiamét
Original Article
  • 80 Downloads

Abstract

Leaf chlorophyll (chl) and protein distribution were analyzed throughout grain filling in four modern maize hybrids with contrasting senescence behavior, at three different canopy levels and at low-N (LN, 18 kg N ha−1) and high-N (HN, 218 kg N ha−1) fertilization levels. Chl content assessed by SPAD resembled protein content only at LN, with delayed senescing genotypes having more leaf protein content than reference genotypes. Across N levels, relative chl content negatively related to light intensity (r2 = 0.59, P < 0.001), while relative protein content did only for the lowest part of the canopy (r2 = 0.54, P < 0.001), suggesting protein distribution in the canopy could be further improved. Relative Rubisco/LHCII partitioning increased from lower to upper leaves (P < 0.09) and differed among genotypes (P < 0.05) with no link to senescence behavior. Photosynthetic electron transport rates were lower at LN and differed between genotypes (P < 0.05) including those with similar leaf protein contents. Chl and protein contents were related across the entire dataset (r2 = 0.53, P < 0.001) but the slope (b) of this relationship varied widely depending on the leaf position (b = 0.026–0.019), the senescence stage (b = 0.014–0.020), the N level (b = 0.035–0.026) and the hybrid (b = 0.016–0.033). Our results suggest that in modern maize hybrids, leaf N utilization can be further improved and that genotypic together with other sources of variation should be included as specific variables in SPAD-based predictions of leaf N content.

Keywords

Nitrogen Stay green Leaf Senescence Protein Zea mays 

Notes

Acknowledgements

This work was supported by Agencia Nacional de Promoción Científica y Tecnológica, Argentina [PICT 1137, 2012; PICT 1092, 2016]. Thanks are due to the staff of the Experimental Field of Facultad de Ciencias Agrarias y Forestales (Universidad Nacional de La Plata), in particular to Ing. Agr. Pablo Etchevers, for their help with crop management.

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

Supplementary material

11738_2019_2943_MOESM1_ESM.docx (361 kb)
Supplementary material 1 (DOCX 360 kb)

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2019

Authors and Affiliations

  1. 1.Instituto de Fisiología Vegetal (INFIVE)Universidad Nacional de La Plata-CONICETBuenos AiresArgentina
  2. 2.EEA General Villegas, INTAGeneral VillegasArgentina

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