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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Plant+Sci
2017 ; 8
(ä): 1463
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English Wikipedia
Climate Clever Clovers: New Paradigm to Reduce the Environmental Footprint of
Ruminants by Breeding Low Methanogenic Forages Utilizing Haplotype Variation
#MMPMID28928752
Kaur P
; Appels R
; Bayer PE
; Keeble-Gagnere G
; Wang J
; Hirakawa H
; Shirasawa K
; Vercoe P
; Stefanova K
; Durmic Z
; Nichols P
; Revell C
; Isobe SN
; Edwards D
; Erskine W
Front Plant Sci
2017[]; 8
(ä): 1463
PMID28928752
show ga
Mitigating methane production by ruminants is a significant challenge to global
livestock production. This research offers a new paradigm to reduce methane
emissions from ruminants by breeding climate-clever clovers. We demonstrate wide
genetic diversity for the trait methanogenic potential in Australia's key pasture
legume, subterranean clover (Trifolium subterraneum L.). In a bi-parental
population the broadsense heritability in methanogenic potential was moderate
(H(2) = 0.4) and allelic variation in a region of Chr 8 accounted for 7.8% of
phenotypic variation. In a genome-wide association study we identified four loci
controlling methanogenic potential assessed by an in vitro fermentation system.
Significantly, the discovery of a single nucleotide polymorphism (SNP) on Chr 5
in a defined haplotype block with an upstream putative candidate gene from a
plant peroxidase-like superfamily (TSub_g18548) and a downstream lectin receptor
protein kinase (TSub_g18549) provides valuable candidates for an assay for this
complex trait. In this way haplotype variation can be tracked to breed pastures
with reduced methanogenic potential. Of the quantitative trait loci candidates,
the DNA-damage-repair/toleration DRT100-like protein (TSub_g26967), linked to
avoid the severity of DNA damage induced by secondary metabolites, is considered
central to enteric methane production, as are disease resistance (TSub_g26971,
TSub_g26972, and TSub_g18549) and ribonuclease proteins (TSub_g26974,
TSub_g26975). These proteins are good pointers to elucidate the genetic basis of
in vitro microbial fermentability and enteric methanogenic potential in
subterranean clover. The genes identified allow the design of a suite of markers
for marker-assisted selection to reduce rumen methane emission in selected
pasture legumes. We demonstrate the feasibility of a plant breeding approach
without compromising animal productivity to mitigate enteric methane emissions,
which is one of the most significant challenges to global livestock production.
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