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Inorganic Nitrogen Assimilation01:22

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Multipronged Phenotyping Approaches to Characterize Sugarcane Root Systems
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Sugarcane genotypes differ in internal nitrogen use efficiency.

Nicole Robinson1, Andrew Fletcher1, Alex Whan1

  • 1School of Integrative Biology, The University of Queensland, Brisbane, Qld 4072, Australia.

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|July 22, 2020
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Summary
This summary is machine-generated.

Sugarcane breeding can reduce nitrogen pollution by selecting for varieties with high internal nitrogen use efficiency (iNUE). This involves assessing genotypes under both low and high nitrogen conditions to identify those with optimal biomass production.

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Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Environmental Science

Background:

  • Nitrogen fertilizer use in agriculture causes significant environmental pollution.
  • Improving nitrogen use efficiency (NUE) in crops is crucial for sustainable agriculture.
  • Sugarcane (Saccharum officinarum L.) breeding offers a potential avenue for reducing nitrogen demand.

Purpose of the Study:

  • To investigate the genetic variation for internal nitrogen use efficiency (iNUE) in sugarcane.
  • To identify sugarcane genotypes with reduced nitrogen requirements.
  • To provide a basis for breeding sugarcane varieties with enhanced nitrogen efficiency.

Main Methods:

  • Examined genotypes from a sugarcane mapping population under controlled low and high nitrogen supply conditions.
  • Assessed biomass production and physiological variables related to nitrogen use.
  • Analyzed genotypic variation for internal nitrogen use efficiency (iNUE).

Main Results:

  • Genotypic variation for biomass and iNUE was significantly greater under low nitrogen supply compared to high nitrogen supply.
  • Elite sugarcane parent Q165 performed well at high nitrogen but not at low nitrogen.
  • Several genotypes exhibited high iNUE under both low and high nitrogen conditions.
  • No direct correlation was found between glutamine synthetase activity and biomass or iNUE in sugarcane.
  • Soluble protein content showed a negative correlation with iNUE and biomass production.

Conclusions:

  • Significant genetic variation for iNUE exists in sugarcane, offering potential for breeding.
  • Breeding programs should evaluate sugarcane genotypes under both low and high nitrogen conditions.
  • Selection of genotypes that maintain high biomass production across varying nitrogen supplies is recommended for sustainable agriculture.