干旱区生态环境知识资源中心(Arid): Introgression of Maize Diversity for Drought Tolerance: Subtropical Maize Landraces as Source of New Positive Variants

Arid

DOI	10.3389/fpls.2021.691211
	Introgression of Maize Diversity for Drought Tolerance: Subtropical Maize Landraces as Source of New Positive Variants
	Barbosa, Pedro Augusto Medeiros; Fritsche-Neto, Roberto; Andrade, Marcela Carvalho; Petroli, Cesar Daniel; Burgueno, Juan; Galli, Giovanni; Willcox, Martha C.; Sonder, Kai; Vidal-Martinez, Victor A.; Sifuentes-Ibarra, Ernesto; Molnar, Terence Luke
通讯作者	Molnar, TL (corresponding author), Int Maize & Wheat Improvement Ctr CIMMYT, Texcoco, Mexico.
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2021
卷号	12
英文摘要	Current climate change models predict an increased frequency and intensity of drought for much of the developing world within the next 30 years. These events will negatively affect maize yields, potentially leading to economic and social instability in many smallholder farming communities. Knowledge about the genetic resources available for traits related to drought tolerance has great importance in developing breeding program strategies. The aim of this research was to study a maize landrace introgression panel to identify chromosomal regions associated with a drought tolerance index. For that, we performed Genome-Wide Association Study (GWAS) on 1326 landrace progenies developed by the CIMMYT Genetic Resources Program, originating from 20 landraces populations collected in arid regions. Phenotypic data were obtained from early testcross trials conducted in three sites and two contrasting irrigation environments, full irrigation (well-watered) and reduced irrigation (drought). The populations were genotyped using the DArTSeq(R) platform, and a final set of 5,695 SNPs markers was used. The genotypic values were estimated using spatial adjustment in a two-stage analysis. First, we performed the individual analysis for each site/irrigation treatment combination. The best linear unbiased estimates (BLUEs) were used to calculate the Harmonic Mean of Relative Performance (HMRP) as a drought tolerance index for each testcross. The second stage was a joint analysis, which was performed using the HMRP to obtain the best linear unbiased predictions (BLUPs) of the index for each genotype. Then, GWAS was performed to determine the marker-index associations and the marker-Grain Yield (GY) associations for the two irrigation treatments. We detected two significant markers associated with the drought-tolerance index, four associated with GY in drought condition, and other four associated with GY in irrigated conditions each. Although each of these markers explained less than 0.1% of the phenotypic variation for the index and GY, we found two genes likely related to the plant response to drought stress. For these markers, alleles from landraces provide a slightly higher yield under drought conditions. Our results indicate that the positive diversity delivered by landraces are still present on the backcrosses and this is a potential breeding strategy for improving maize for drought tolerance and for trait introgression bringing new superior allelic diversity from landraces to breeding populations.
英文关键词	plant breeding GWAS spatial analysis abiotic stress early testcross
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000705908700001
WOS关键词	GENOME-WIDE ASSOCIATION ; SPATIAL-ANALYSIS ; ARABINOGALACTAN-PROTEINS ; LINKAGE DISEQUILIBRIUM ; AGRONOMIC TRAITS ; STRESS TOLERANCE ; WATER-STRESS ; GENE FAMILY ; KERNEL SET ; ARABIDOPSIS
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363352
作者单位	[Barbosa, Pedro Augusto Medeiros; Fritsche-Neto, Roberto; Galli, Giovanni] Univ Sao Paulo, Dept Genet, Luiz de Queiroz Coll Agr, Allogamous Plant Breeding Lab, Piracicaba, Brazil; [Andrade, Marcela Carvalho; Petroli, Cesar Daniel; Burgueno, Juan; Willcox, Martha C.; Sonder, Kai; Molnar, Terence Luke] Int Maize & Wheat Improvement Ctr CIMMYT, Texcoco, Mexico; [Vidal-Martinez, Victor A.; Sifuentes-Ibarra, Ernesto] Inst Nacl Invest Forest Agr & Pecuarias INIFAP, Mexico City, DF, Mexico
推荐引用方式 GB/T 7714	Barbosa, Pedro Augusto Medeiros,Fritsche-Neto, Roberto,Andrade, Marcela Carvalho,et al. Introgression of Maize Diversity for Drought Tolerance: Subtropical Maize Landraces as Source of New Positive Variants[J],2021,12.
APA	Barbosa, Pedro Augusto Medeiros.,Fritsche-Neto, Roberto.,Andrade, Marcela Carvalho.,Petroli, Cesar Daniel.,Burgueno, Juan.,...&Molnar, Terence Luke.(2021).Introgression of Maize Diversity for Drought Tolerance: Subtropical Maize Landraces as Source of New Positive Variants.FRONTIERS IN PLANT SCIENCE,12.
MLA	Barbosa, Pedro Augusto Medeiros,et al."Introgression of Maize Diversity for Drought Tolerance: Subtropical Maize Landraces as Source of New Positive Variants".FRONTIERS IN PLANT SCIENCE 12(2021).