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No need to breed for enhanced colonization by arbuscular mycorrhizal fungi to improve low-P adaptation of West African sorghums

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Title No need to breed for enhanced colonization by arbuscular mycorrhizal fungi to improve low-P adaptation of West African sorghums
 
Creator Leiser, Willmar
 
Contributor Olatoye, Marcus O.
Rattunde, Fred
Neumann, Kerstin
Weltzien, Eva
Haussmann, Bettina
 
Subject genetic
mycorrhiza
p efficiency
 
Description Aims Western Africa (WA) sorghums are predominantly
cultivated under low plant available phosphorus (P)
soil conditions with a diverse population of arbuscular
mycorrhizal fungi (AMF) present. This study aims to
determine whether sorghum breeding programs should
target higher colonization by AMF through understanding
the genotypic variation of sorghum for AMF-root
colonization (AMF-RC) under different P-fertility conditions
at different growth stages and assessing the genetics underlying AMF-RC using genome-wide association
study (GWAS).
Method A sorghum diversity panel of 187 WA genotypes
was grown in low-P soil in a pot trial for 38 days
and a subset of 13 genotypes was grown in a low- and
high-P field until maturity at ICRISAT-Samanko in Mali,
WA. Root samples were taken at 38 days from the pot
trial plants and at flowering time in the field trials. Shoot
biomass was analyzed for P concentration and dry matter
yield.GWAS was conducted for shoot-P-content and
AMF-RC.
Results Significant genotypic variation was observed
for AMF-RC, but the repeatability estimates were only
low (w2=0.15 at 38 days) to moderate (w2 =0.54–
0.56 at flowering time). AMF-RC was significantly
higher in low-P versus high-P field conditions. Large
residual variation was observed for AMF-RC in both
pot and field trials. None of the genotypic groups, contrasting
for selection history, race and grain yield performance
across multiple field trials, differed significantly
for AMF-RC. AMF-RC showed no or negative
relationships to shoot-P-content and grain yield, irrespective
of soil-P level or plant developmental stage.
AMF-RC at 38 days was significantly correlated
(r=67**) to AMF-RC at flowering. However, GWAS
did not detect significant genomic regions for AMF-RC
but did for shoot-P content.
Conclusion Although genetic differences for AMFRC
were detected, the trait appears to be highly
polygenic. Genotypic selection for higher AMF-RC
in WA sorghums is not promising due to the low
heritability and the lack of positive relationships with
P acquisition.
 
Date 2017-03-22T02:27:01Z
2017-03-22T02:27:01Z
 
Type Journal Article
 
Identifier http://oar.icrisat.org/id/eprint/8926
https://mel.cgiar.org/reporting/download/hash/QdykDS4i
Willmar Leiser, Marcus O. Olatoye, Fred Rattunde, Kerstin Neumann, Eva Weltzien, Bettina Haussmann. (30/4/2016). No need to breed for enhanced colonization by arbuscular mycorrhizal fungi to improve low-P adaptation of West African sorghums. Plant and Soil, 401 (1), pp. 51-64.
https://hdl.handle.net/20.500.11766/6533
Open access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF
 
Publisher Springer Verlag (Germany)
 
Source Plant and Soil;401,(2016) Pagination 51-64