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20 April 2022 Nitrogen accumulation and remobilisation in wheat and barley plants exposed to waterlogging at different developmental stages
Romina P. de San Celedonio, L. Gabriela Abeledo, Gustavo G. Striker, Daniel J. Miralles
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Abstract

Context. Although waterlogging is known to decrease grain yield in wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.), its effect on plant N traits is still unknow.

Aims. This study evaluated biomass N dynamics and partitioning to grains, in wheat and barley plants subjected to waterlogging.

Methods. Under contrasting environmental conditions, two pot experiments exposing wheat and barley plants to waterlogging events for 15–20 days at five different developmental stages, from emergence to maturity were performed. Grain N concentration, grain N content, biomass N concentration, N utilisation efficiency (NUE) and N remobilisation were recorded.

Key results. Both species responded similarly to waterlogging for most N traits. Reductions in grain N content differed according to the moment waterlogging occurred. The greatest reductions (46–77% compared to the control) being for waterlogging from the beginning of stem elongation to anthesis, which also showed the highest reductions in N remobilisation, N uptake at maturity, and N partitioning to the grains, but only a slight decrease in NUE. Grain N concentration raised drastically (up to 45 mg N g DW−1) with minimal grain yields. N concentration of aboveground biomass decreased during waterlogging, recovering control values at maturity. N content at maturity was related to the total biomass.

Conclusions. Waterlogging differentially reduced N uptake and remobilisation to grains of wheat and barley depending on the developmental stage when water excess occurred.

Implications. The impact of waterlogging on N economy of wheat and barley appears indirect and predominantly related to carrying effects of the stress on carbon economy due to growth reductions.

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Romina P. de San Celedonio, L. Gabriela Abeledo, Gustavo G. Striker, and Daniel J. Miralles "Nitrogen accumulation and remobilisation in wheat and barley plants exposed to waterlogging at different developmental stages," Crop and Pasture Science 73(6), 615-626, (20 April 2022). https://doi.org/10.1071/CP21569
Received: 3 July 2021; Accepted: 18 December 2021; Published: 20 April 2022
KEYWORDS
flooding
grain nitrogen concentration
grain nitrogen yield
Hordeum vulgare L.
nitrogen uptake
nitrogen utilisation
plant nitrogen economy
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