Haploid identification using tropicalized haploid inducer progenies in maize

• Published in: Crop breeding and applied biotechnology Vol. 18; no. 1; pp. 16 - 23
• Main Authors: Ribeiro, Camila Bastos, Pereira, Francielly de Cássia, Nóbrega Filho, Lamartine da, Rezende, Breno Alvarenga, Dias, Kaio Olímpio das Graças, Braz, Guilherme Tomaz, Ruy, Murilo Candido, Silva, Maria Beatriz, Cenzi, Gisele, Techio, Vânia Helena, Souza, João Cândido de
• Format: Journal Article
• Language: English
• Published: Vicosa Crop Breeding and Applied Biotechnology 01.01.2018
• Subjects: AGRONOMY; BIOTECHNOLOGY & APPLIED MICROBIOLOGY; Chromosomes; Corn; Cytometry; Flow cytometry; Gene duplication; Genotype & phenotype; Markers; Microsatellites; Ploidy; Reproduction (copying); Seeds; Vigor; Flow cytometry; Zea mays; chromosome counting; ploidy level; chromosome duplication
• ISSN: 1518-7853; 1984-7033; 1984-7033
• DOI: 10.1590/1984-70332018v18n1a3

The aim of this study was to identify maize haploid plants and compare the efficiency of identification of maize haploid plants using the R1-nj morphological marker, plant vigor, flow cytometry, chromosome counting, and microsatellite molecular markers under tropical conditions. We also established a protocol for chromosome duplication in maize haploid plants. Fourteen S0:1 and seven S2:3 haploid inducer progenies were crossed with GNZ9501 in 2012/2013 and 2014/2015, respectively. Through use of the R1-nj trait, we were able to identify 552 putative haploid seeds in 2012/2013 and 260 putative haploid seeds in 2014/2015. Only 1.84% were true positives according to flow cytometry in 2012/2013. In 2014/2015, 75% of the putative haploids were true negatives according to molecular markers. Plant vigor had a high proportion of true negatives. Molecular markers and flow cytometry are more efficient in classifying plant ploidy level. Chromosome duplication was efficient in all plants.