Abstract
Lr34 is an important adult plant resistance gene that is effective against a number of wheat ( Triticum aestivum L.) diseases and has proved durable for over 100 yr. However, the energy requirements of Lr34 resistance, combined with the pleiotrophic effect of leaf tip necrosis, can result in reduced yield potential. To evaluate the absence of Lr34 from elite breeding material, a cross was made between similar‐yielding, milling wheat cultivars ‘Conquest’ ( Lr34sus ) and ‘Bakker Gold’ ( Lr34res ). Independent lines were carried forward and, at the F 4 stage, sister pairs were selected for the different homozygous alleles of the marker csLV34, corresponding to Lr34res or Lr34sus . These lines were further selfed to produce nine stable F 8 pairs ( Lr34res and Lr34sus ) for field trialing and evaluation over 3 yr under a range of fungicide treatments. In the absence of fungicide and with natural infections of stripe rust ( Puccinia striiformis f.sp. tritici ) and leaf rust ( Puccinia triticina ), Lr34res lines had lower disease severity, increased total yield, and better grain quality than Lr34sus lines. This pattern was reversed under full fungicide control, as Lr34sus lines displayed higher mean plot yield (2010: +4.3%, p < 0.001; 2012: +4.4%, p < 0.001) and possessed superior grain quality data than the Lr34res lines. The high‐yield, high‐input farming environment and the use of full fungicide control in New Zealand's current wheat cultivar trialing system means that genetic sources of rust resistance such as Lr34 provide little or no competitive advantage.
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Claims 7
Claim · model-written summary
Without fungicide, Lr34res wheat lines had lower disease severity than Lr34sus lines under natural stripe and leaf rust infection.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- Lr34res linese0
- Interactor
- Puccinia striiformis f.sp. tritici
Puccinia striiformis f. sp. triticie0pathogen - Second interactor
- Puccinia triticina
Puccinia triticinae0pathogen - Gene
- Lr34rese0
- Outcome
- disease severitye0
- Direction
- lowere0
- Comparator
- Lr34sus linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of fungicide and with natural infections of stripe rust ( Puccinia striiformis f.sp. tritici ) and leaf rust ( Puccinia triticina ), Lr34res lines had lower disease severity, increased total yield, and better grain quality than Lr34sus lines.”
t0“Wheat Breeding Programs”
Claim · model-written summary
Without fungicide, Lr34res lines yielded more than Lr34sus lines under natural rust infection.
- Taxon
- WheatTriticum aestivumt0
- Interactor
- Puccinia striiformis f.sp. triticiPuccinia striiformis f. sp. triticie0pathogen
- Second interactor
- Puccinia triticinaPuccinia triticinae0pathogen
- Gene
- Lr34rese0
- Outcome
- total yielde0
- Direction
- increasede0
- Comparator
- Lr34sus linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of fungicide and with natural infections of stripe rust ( Puccinia striiformis f.sp. tritici ) and leaf rust ( Puccinia triticina ), Lr34res lines had lower disease severity, increased total yield, and better grain quality than Lr34sus lines.”
t0“Wheat Breeding Programs”
Claim · model-written summary
Without fungicide, Lr34res lines had better grain quality than Lr34sus lines.
- Taxon
- WheatTriticum aestivumt0
- Gene
- Lr34rese0
- Outcome
- grain qualitye0
- Direction
- bettere0
- Comparator
- Lr34sus linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of fungicide and with natural infections of stripe rust ( Puccinia striiformis f.sp. tritici ) and leaf rust ( Puccinia triticina ), Lr34res lines had lower disease severity, increased total yield, and better grain quality than Lr34sus lines.”
t0“Wheat Breeding Programs”
Claim · model-written summary
With full fungicide control, Lr34sus lines had higher mean plot yield in 2010 than Lr34res lines.
- Taxon
- WheatTriticum aestivumt0
- Gene
- Lr34suse0
- Outcome
- mean plot yielde0
- Direction
- highere0
- Value
- +4.3%e0
- Qualifier
- 2010e0
- Comparator
- Lr34res linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This pattern was reversed under full fungicide control, as Lr34sus lines displayed higher mean plot yield (2010: +4.3%, p < 0.001; 2012: +4.4%, p < 0.001) and possessed superior grain quality data than the Lr34res lines.”
t0“Wheat Breeding Programs”
Claim · model-written summary
With full fungicide control, Lr34sus lines had higher mean plot yield in 2012 than Lr34res lines.
- Taxon
- WheatTriticum aestivumt0
- Gene
- Lr34suse0
- Outcome
- mean plot yielde0
- Direction
- highere0
- Value
- +4.4%e0
- Qualifier
- 2012e0
- Comparator
- Lr34res linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This pattern was reversed under full fungicide control, as Lr34sus lines displayed higher mean plot yield (2010: +4.3%, p < 0.001; 2012: +4.4%, p < 0.001) and possessed superior grain quality data than the Lr34res lines.”
t0“Wheat Breeding Programs”
Claim · model-written summary
With full fungicide control, Lr34sus lines had superior grain quality to Lr34res lines.
- Taxon
- WheatTriticum aestivumt0
- Gene
- Lr34suse0
- Outcome
- grain quality datae0
- Direction
- superiore0
- Comparator
- Lr34res linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This pattern was reversed under full fungicide control, as Lr34sus lines displayed higher mean plot yield (2010: +4.3%, p < 0.001; 2012: +4.4%, p < 0.001) and possessed superior grain quality data than the Lr34res lines.”
t0“Wheat Breeding Programs”
Claim · model-written summary
The authors conclude Lr34 provides little or no competitive advantage in the current high-input New Zealand trial system with full fungicide control.
- Taxon
- wheatTriticum aestivume0
- Gene
- Lr34e0
- Outcome
- little or no competitive advantagee0
- Setting
- New Zealande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high‐yield, high‐input farming environment and the use of full fungicide control in New Zealand's current wheat cultivar trialing system means that genetic sources of rust resistance such as Lr34 provide little or no competitive advantage.”