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Functional dynamics of the nitrogen balance of sorghum: I. N demand of vegetative plant parts.

van Oosterom, E.J. and Borrell, A.K. and Chapman, S.C. and Broad, I.K. and Hammer, G.L. (2009) Functional dynamics of the nitrogen balance of sorghum: I. N demand of vegetative plant parts. Field Crops Research, 115 (1). pp. 19-28.

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Article Link(s): http://dx.doi.org/10.1016/j.fcr.2009.09.018

Publisher URL: http://www.elsevier.com

Abstract

Stay-green, an important trait for grain yield of sorghum grown under water limitation, has been associated with a high leaf nitrogen content at the start of grain filling. This study quantifies the N demand of leaves and stems and explores effects of N stress on the N balance of vegetative plant parts of three sorghum hybrids differing in potential crop height. The hybrids were grown under well-watered conditions at three levels of N supply. Vertical profiles of biomass and N% of leaves and stems, together with leaf size and number, and specific leaf nitrogen (SLN), were measured at regular intervals. The hybrids had similar minimum but different critical and maximum SLN, associated with differences in leaf size and N partitioning, the latter associated with differences in plant height. N demand of expanding new leaves was represented by critical SLN, and structural stem N demand by minimum stem N%. The fraction of N partitioned to leaf blades increased under N stress. A framework for N dynamics of leaves and stems is developed that captures effects of N stress and genotype on N partitioning and on critical and maximum SLN.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Elsevier B.V.
Keywords:Leaf N; leaf size; partitioning; SLN; stay-green; tillering.
Subjects:Plant culture > Field crops > Grain. Cereals
Agriculture > Agriculture (General) > Fertilisers
Science > Statistics > Statistical data analysis
Deposited On:09 Apr 2010 03:05
Last Modified:26 Oct 2011 04:54

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