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4. ZmMATE1improves grain yield and yield stability in maize cultivated on acid soil

Author

Vasconcellos, Renato C. C., Mendes, Flávia F., Oliveira, Antônio Carlos, Guimarães, Lauro J. M., Albuquerque, Paulo E. P., Pinto, Marcos O., Barros, Beatriz A., Pastina, Maria Marta, Magalhaes, Jurandir V., and Guimaraes, Claudia T.

Abstract

The development of aluminum (Al)‐tolerant cultivars is a complementary strategy to overcome the constraints caused by Al toxicity on acid soils and can contribute positively to the food supply for the growing global population. A major Al tolerance quantitative trait locus in maize is controlled by a citrate transporter encoded by ZmMATE1. Our goal was to evaluate the impact of the superior allele of ZmMATE1on the yield performance of maize lines and hybrids cultivated on acid soils. Near‐isogenic lines carrying the superior allele of ZmMATE1, and the recurrent Al‐sensitive parent were crossed with elite lines, generating near‐isogenic hybrids contrasting for these alleles. All maize genotypes carrying this superior allele were more Al tolerant in nutrient solution than their isogenic counterparts having the ZmMATE1allele derived from the Al‐sensitive parent. These genotypes were cultivated in control and Al stress soils for 2 yr. Aluminum toxicity caused a significant yield reduction of 18.7% for lines and 14.7% for hybrids over the 2 yr. The yield performance of maize genotypes declined in the second year compared with the first year, probably due to water deficiency after the grain‐filling stage. The superior allele of ZmMATE1in maize hybrids conferred yield gains from 21 to 48% compared with the hybrids harboring the alternative allele in the Al stress soil in the first and second years, respectively. As this superior allele is rare in maize and is likely absent in several elite germplasms, molecular breeding based on ZmMATE1can improve maize yield stability on acid soils. High Al toxicity on acid soil causes a significant reduction in maize yield.The superior allele of ZmMATE1improves maize yield on acid soil.Yield constraints on acid soil are ameliorated by this ZmMATE1allele in maize hybrids.This ZmMATE1allele is strategic in maize breeding to increase yield stability on acid soils.

Published
2021
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6. Genome-Wide Linkage and Association Mapping of Halo Blight Resistance in Common Bean to Race 6 of the Globally Important Bacterial Pathogen

Author

Tock, Andrew J., primary, Fourie, Deidré, additional, Walley, Peter G., additional, Holub, Eric B., additional, Soler, Alvaro, additional, Cichy, Karen A., additional, Pastor-Corrales, Marcial A., additional, Song, Qijian, additional, Porch, Timothy G., additional, Hart, John P., additional, Vasconcellos, Renato C. C., additional, Vicente, Joana G., additional, Barker, Guy C., additional, and Miklas, Phillip N., additional

Published
2017
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7. Meta-QTL for resistance to white mold in common bean

Author

Vasconcellos, Renato C. C., primary, Oraguzie, O. Blessing, additional, Soler, Alvaro, additional, Arkwazee, Haidar, additional, Myers, James R., additional, Ferreira, Juan J., additional, Song, Qijian, additional, McClean, Phil, additional, and Miklas, Phillip N., additional

Published
2017
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8. SSR MARKERS LINKED TO META-QTLS FOR WHITE MOLD RESISTANCE IN COMMON BEAN

Author

Porto, Antonio Carlos M., Souza Lopes, Fernanda, Vasconcellos, Renato C. C., Leite, Monik Evelin, dos Santos, João Bosco, Porto, Antonio Carlos M., Souza Lopes, Fernanda, Vasconcellos, Renato C. C., Leite, Monik Evelin, and dos Santos, João Bosco

Abstract

INTRODUCTION Several studies have been conducted to identify QTLs for resistance to white mold in Phaseolus vulgaris. SSR markers have the advantages of being codominant and distributed throughout the genome, being considered one of the best genetic markers for mapping purposes and efficient to identify QTLs (Soule et al. 2011). In the meta-QTL analysis, SSR markers can be used to identify stable genomic regions in populations, and therefore, be more promising in marker-assisted selection programs. The objective of the study was to identify SSR markers nearby and/or within the meta-QTL intervals described by Vasconcellos et al. (2017), in order to evaluate the possibility of using these markers for resistance to Sclerotinia sclerotiorum in common bean. MATERIAL AND METHODS Two progenies derived of a recurrent selection program for resistance to white mold were used one from Cycle X (CX 53/3) and one from Cycle XII (CX 11/185) and two checks: Cornell 605 (resistant) and Beryl (susceptible). The Cornell 605 line is derived from the cross between the Redkote (Cornell University, NY, USA) and the Cornell line 6603 (Griffiths et al., 2012). The Beryl line is highly susceptible to white mold and is used as a negative control in several studies involving this pathosystem (Griffiths et al. 2012; Lehner et al., 2015). The plants had its DNA extracted and were evaluated for the reaction to S. sclerotiorum by the Straw test method, described by (Petzoldt and Dickson, 1996) and modified by (Terán et al., 2006). SSR primers located within or very close to the meta-QTLs (Vasconcellos et al. 2017) and, that had polymorphism between check lines were selected thus, marking it possible to identify more stable QTLs of resistance and/or susceptibility (Table 1).

Published
2017

9. Genetic dissection of Al tolerance QTLs in the maize genome by high density SNP scan.

Author

Guimaraes, Claudia T., Simoes, Christiano C., Pastina, Maria Marta, Maron, Lyza G., Magalhaes, Jurandir V., Vasconcellos, Renato C. C., Guimaraes, Lauro J. M., Lana, Ubiraci G. P., Tinoco, Carlos F. S., Noda, Roberto W., Jardim-Belicuas, Silvia N., Kochian, Leon V., Alves, Vera M. C., and Parentoni, Sidney N.

Subjects
CORN genetics, PLANT genomes, PLANT chromosomes, TOXICOLOGY of aluminum, ACID soils
Abstract

Background Aluminum (Al) toxicity is an important limitation to food security in tropical and subtropical regions. High Al saturation on acid soils limits root development, reducing water and nutrient uptake. In addition to naturally occurring acid soils, agricultural practices may decrease soil pH, leading to yield losses due to Al toxicity. Elucidating the genetic and molecular mechanisms underlying maize Al tolerance is expected to accelerate the development of Altolerant cultivars. Results Five genomic regions were significantly associated with Al tolerance, using 54,455 SNP markers in a recombinant inbred line population derived from Cateto Al237. Candidate genes co-localized with Al tolerance QTLs were further investigated. Near-isogenic lines (NILs) developed for ZmMATE2 were as Al-sensitive as the recurrent line, indicating that this candidate gene was not responsible for the Al tolerance QTL on chromosome 5, qALT5. However, ZmNrat1, a maize homolog to OsNrat1, which encodes an Al3+ specific transporter previously implicated in rice Al tolerance, was mapped at ~40 Mbp from qALT5. We demonstrate for the first time that ZmNrat1 is preferentially expressed in maize root tips and is up-regulated by Al, similarly to OsNrat1 in rice, suggesting a role of this gene in maize Al tolerance. The strongest-effect QTL was mapped on chromosome 6 (qALT6), within a 0.5 Mbp region where three copies of the Al tolerance gene, ZmMATE1, were found in tandem configuration. qALT6 was shown to increase Al tolerance in maize; the qALT6-NILs carrying three copies of ZmMATE1 exhibited a two-fold increase in Al tolerance, and higher expression of ZmMATE1 compared to the Al sensitive recurrent parent. Interestingly, a new source of Al tolerance via ZmMATE1 was identified in a Brazilian elite line that showed high expression of ZmMATE1 but carries a single copy of ZmMATE1. Conclusions High ZmMATE1 expression, controlled either by three copies of the target gene or by an unknown molecular mechanism, is responsible for Al tolerance mediated by qALT6. As Al tolerant alleles at qALT6 are rare in maize, marker-assisted introgression of this QTL is an important strategy to improve maize adaptation to acid soils worldwide. [ABSTRACT FROM AUTHOR]

Published
2014
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