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Genome-wide association study of resistance to cassava green mite pest and related traits in cassava

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Title Genome-wide association study of resistance to cassava green mite pest and related traits in cassava
 
Creator Ezenwaka, L.C.
Carpio, D.P. del
Jannink, Jean-Luc
Rabbi, Ismail Y.
Danquah, E.Y.
Asante, I.
Danquah, A.
Blay, E.
Egesi, Chiedozie N.
 
Subject cassava
mononychellus tanajoa
fertilizers
planting
 
Description Published: 26 July 2018
Cassava green mite [CGM, Mononychellus tanajoa (Bondar)] is a dry-season pest that usually feeds on the underside of young leaves causing leaf chlorosis, stunted growth, and root yield reduction by 80%. Since cassava (Manihot esculenta Crantz) leaves and roots serve as a primary staple food source, a decline in cassava yield can lead to household food, nutrition, and income insecurity. To evaluate the existence of CGM resistance alleles in the available germplasm, a diversity panel of 845 advanced breeding lines obtained from IITA, CIAT, and the National Root Crops Research Institute (NRCRI) were evaluated for CGM severity (CGMS), leaf pubescence (LP), leaf retention (LR), stay green, shoot tip compactness, and shoot tip size. A genome-wide association mapping detected 35 single-nucleotide polymorphisms (SNPs) markers significantly associated with CGMS, LP, and LR on chromosome 8. Colocalization of the most significant SNP associated with CGMS, LP, and LR on chromosome 8 is possibly an indication of pleiotropy or the presence of closely linked genes that regulate these traits. Seventeen candidate genes were found to be associated to CGM resistance. These candidate genes were subdivided into seven categories according to their protein structure namely, Zn finger, pentatricopeptide, MYB, MADS, homeodomain, trichome birefringence-related protein, and ethylene-responsive transcription factor genes. This study revealed significant loci associated with CGM, not previously reported, which together represent potential sources for the ongoing effort to develop multiple pest- and disease-resistant cassava cultivars.
 
Date 2018-09
2018-09-11T16:04:44Z
2018-09-11T16:04:44Z
 
Type Journal Article
 
Identifier Ezenwaka, L., Del Carpio D.P., Jannink, J.L., Rabbi, I.Y., Danquah, E., Asante, I., ... & Egesi, C. (2018). Genome-wide association study of resistance to cassava green mite pest and related traits in cassava. Crop Science, 58(5), 1907-1918.
0011-183X
https://hdl.handle.net/10568/97154
https://doi.org/10.2135/cropsci2018.01.0024
BIOTECH & PLANT BREEDING
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 1907-1918
application/pdf
 
Publisher Wiley
 
Source Crop Science