title: Selection indices to identify drought-tolerant grain sorghum cultivars.
abstract: Twenty-five cultivars of grain sorghum [Sorghum bicolor (L.) Moench] were examined under both drought stress and normal conditions in 4 experiments. In each condition, genotypes were evaluated in a factorial experiment using a randomized complete block design with 3 replications. Eight drought tolerance indices including stability tolerance index, mean productivity (MP), geometric MP, harmonic mean, stress susceptibility index, tolerance index, yield index, and yield stability index were estimated for each genotype based on grain yield under drought (Ys) and irrigated conditions (Yp). The results indicated that there were positive and significant correlations among Yp and Ys with geometric MP, MP, harmonic mean, and stability tolerance index, indicating that these factors are better predictors of Yp and Ys than tolerance index, stress susceptibility index, yield stability index, and yield index. Based on adjusted means at Yp and Ys, indices geometric MP, MP, harmonic mean, and stability tolerance index, unweighted pair group method with arithmetic mean cluster and biplot analysis, the most tolerant cultivars were '9929020', '9929034', and 'N 95B'.
authors.affiliation: Embrapa Milho e Sorgo, Sete Lagoas, MG, Brasil cicero.menezes@embrapa.br.
authors.forename: C B
authors.initials: CB
authors.lastname: Menezes
authors.affiliation: Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brasil.
authors.forename: C A
authors.initials: CA
authors.lastname: Ticona-Benavente
authors.affiliation: Embrapa Milho e Sorgo, Sete Lagoas, MG, Brasil.
authors.forename: F D
authors.initials: FD
authors.lastname: Tardin
authors.affiliation: Embrapa Meio Norte, Teresina, PI, Brasil.
authors.forename: M J
authors.initials: MJ
authors.lastname: Cardoso
authors.affiliation: Embrapa Meio Norte, Teresina, PI, Brasil.
authors.forename: E A
authors.initials: EA
authors.lastname: Bastos
authors.affiliation: Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: D W
authors.initials: DW
authors.lastname: Nogueira
authors.affiliation: Embrapa Milho e Sorgo, Sete Lagoas, MG, Brasil.
authors.forename: A F
authors.initials: AF
authors.lastname: Portugal
authors.affiliation: Universidade Federal de São João Del-Rei, Sete Lagoas, MG, Brasil.
authors.forename: C V
authors.initials: CV
authors.lastname: Santos
authors.affiliation: Embrapa Milho e Sorgo, Sete Lagoas, MG, Brasil.
authors.forename: R E
authors.initials: RE
authors.lastname: Schaffert
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D057914:Agricultural Irrigation / Q000706:statistics & numerical data; D001938:Brazil; D016000:Cluster Analysis; D055864:Droughts; D005838:Genotype; D015233:Models, Statistical; D012621:Seasons; D012639:Seeds / Q000235:genetics* / Q000378:metabolism; D045868:Sorghum / Q000235:genetics* / Q000378:metabolism; D013312:Stress, Physiological / Q000235:genetics*; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water