Post-anthesis nitrate uptake is critical to yield and grain protein content in Sorghum bicolor

Worland, Belinda, Robinson, Nicole, Jordan, David, Schmidt, Susanne and Godwin, Ian (2017) Post-anthesis nitrate uptake is critical to yield and grain protein content in Sorghum bicolor. Journal of Plant Physiology, 216 118-124. doi:10.1016/j.jplph.2017.05.026

Author Worland, Belinda
Robinson, Nicole
Jordan, David
Schmidt, Susanne
Godwin, Ian
Title Post-anthesis nitrate uptake is critical to yield and grain protein content in Sorghum bicolor
Journal name Journal of Plant Physiology   Check publisher's open access policy
ISSN 0176-1617
Publication date 2017-09-01
Sub-type Article (original research)
DOI 10.1016/j.jplph.2017.05.026
Open Access Status Not yet assessed
Volume 216
Start page 118
End page 124
Total pages 7
Place of publication Muenchen, Germany
Publisher Elsevier GmbH - Urban und Fischer
Language eng
Formatted abstract
Crops only use ∼50% of applied nitrogen (N) fertilizer creating N losses and pollution. Plants need to efficiently uptake and utilize N to meet growing global food demands. Here we investigate how the supply and timing of nitrate affects N status and yield in Sorghum bicolor (sorghum). Sorghum was grown in pots with either 10 mM (High) or 1 mM (Low) nitrate supply. Shortly before anthesis the nitrate supply was either maintained, increased 10-fold or eliminated. Leaf sheaths of sorghum grown with High nitrate accumulated nitrate in concentrations >3-times higher than leaves. Removal of nitrate supply pre-anthesis resulted in the rapid reduction of stored nitrate in all organs. Plants receiving a 10-fold increase in nitrate supply pre-anthesis achieved similar grain yield and protein content and 29% larger grains than those maintained on High nitrate, despite receiving 24% less nitrate over the whole growth period. In sorghum, plant available N is important throughout development, particularly anthesis and grain filling, for grain yield and grain protein content. Nitrate accumulation in leaf sheaths presents opportunities for the genetic analysis of mechanisms behind nitrate storage and remobilization in sorghum to improve N use efficiency.
Keyword Nitrate
Nitrate accumulation
Nitrogen remobilization
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
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