Fifty years of wheat breeding in Southern Brazil: yield improvement and associated changes

Rodrigues, O.; Lhamby, Julio Cesar Barreneche; Didonet, Agostinho Dirceu; Marchese, José Abramo

doi:10.1590/s0100-204x2007000600008

Cited by 35 publications

(35 citation statements)

References 22 publications

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“…The association between BY and GY was equal to 0.85** and 0.82** in Pato Branco and Coxilha, respectively (Figure 3a). These results agree with Rodrigues et al (2007), who found that the genetic gain for GY was more associated with BY than HI in Brazil (r=0.79**). However, this contradicts other studies which point out that the HI is the main responsible for pushing forward the genetic potential of grain yield in wheat (Cox et al, 1988).…”

Section: Resultssupporting

confidence: 91%

Characterization of brazilian wheat cultivars in terms of nitrogen use efficiency

et al. 2014

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Nitrogen (N) management in wheat crop is one of the most studied agricultural practices in Brazil; however, there are few reports on its use efficiency. The objective of this study was to characterize 18 Brazilian wheat cultivars, which are representative and have been recently released to cultivation, for nitrogen use efficiency (NUE). The experiments were carried out in Pato Branco, Paraná, and Coxilha, Rio Grande do Sul, during the 2011 crop season. It was used a randomized block design with three replications, in factorial scheme (2 environments × 18 cultivars). Genetic variability was observed for nitrogen utilization efficiency by grains (NUtEg=47.6 to 81.1 kg kg -1 ) and nitrogen harvest index (NHI=71.3 to 84.6%) with significant effects relating to the environment of cultivation and performance of these traits. The evaluation of the protein concentration of grain by near infrared spectrometry (GPC N ) produced equivalent results to the direct analytical method of Kjeldahl (GPC K ), in Pato Branco (r=0.56) and Coxilha (RS) (r=0.80). However the CPG N overestimated the protein values by 16.85%. The GPC and protein yield were positively correlated with NUtEg and NHI. The best performance for the traits associated with NUE was observed for the following cultivars: Mirante, Quartzo, Fundacep Cristalino, Fundacep Raízes and CD 150. This is the first report of differences between Brazilian wheat cultivars for nitrogen use efficiency.Key words: Triticum aestivum L., grain yield, nitrogen harvest index, SDS sedimentation, grain protein concentration. Caracterização de cultivares de trigo em termos de eficiência do uso do nitrogênioResumo O manejo do nitrogênio (N) na cultura do trigo é uma das práticas agrícolas mais estudadas no Brasil, entretanto ainda são poucos os relatos sobre a sua eficiência de uso. O objetivo deste estudo foi caracterizar 18 cultivares de trigo brasileiras representativas e recentemente disponibilizados para cultivo quanto à eficiência do uso do N (EUN). Os experimentos foram executados em Pato Branco, PR, e Coxilha, RS, na safra agrícola de 2011. O delineamento experimental utilizado foi em blocos casualizados em esquema fatorial (2 ambientes × 18 cultivares), em três repetições. Foi possível identificar variabilidade genética para a eficiência do uso do nitrogênio pelos grãos (EUNg = 47,6 a 81,1 kg kg -1 N) e índice de colheita de nitrogênio (ICN = 71,3 a 84,6%), com efeito do local de cultivo sobre o desempenho desses parâmetros. A avaliação da concentração proteica dos grãos por espectrometria de infravermelho próximo (CPG N ) produziu resultados equivalentes ao método analítico direto de Kjeldahl (CPG K ), em Pato Branco, PR (r = 0,56), e Coxilha, RS (r = 0,80), porém o CPG N superestimou os resultados em 16,85%. A CPG K e o rendimento de proteína (RP) foram positivamente associados com a EUNg. As cultivares Mirante, Quartzo, Fundacep Cristalino, Fundacep Raízes e CD 150 apresentaram melhor desempenho para os caracteres associados à EUN. Esse é o primeiro relato que mostra di...

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Section: Resultssupporting

confidence: 91%

Characterization of brazilian wheat cultivars in terms of nitrogen use efficiency

et al. 2014

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“…In other words, the variation in harvest index was strongly associated with the recurrent selection cycles attained. Retrospective studies associate increases in yield with null (Acreche et al 2008) or significant increases (Rodrigues et al 2007;Reynolds et al 2009;Xiao et al 2012) in total biomass production. Our results did not show a significant trend in biomass production as dependent on the number of recurrent selection cycles (Fig.…”

Section: Cereal Research Communications 42 2014mentioning

confidence: 99%

“…Regarding the association between grain number and its weight, Morgounov et al (2010) showed that the number of grains per unit area and the thousand-kernel weight were linearly correlated with grain yield. However, several authors observed that the number of grains had increased over time without alteration of the weight of the grains (Rodrigues et al 2007;Acreche et al 2008). Similar results were obtained in this study under conventional tillage.…”

Section: Cereal Research Communications 42 2014mentioning

confidence: 99%

Genotype × tillage interaction in a recurrent selection program in wheat

Maich¹,

Rienzo²

2014

Cereal Research Communications

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The objective of this study was to test if the response to 10 cycles of a recurrent selection program conducted under conventional tillage and rain fed conditions was the same when contrasted, for several traits, under conventional and non-tillage practices. During two season (2011 and 2012) the 44 S-derived families (four/C 0 to C 10 populations) were evaluated under conventional and non-tillage systems in two fields next to each other. Days to anthesis, plant height, grain, and biomass yield and 1000-grain weight were determined. The grain number per m 2 and harvest index was also estimated. From a random sample of 10 tillers the spikelet per spike and grains per spike were measured. For each trait, a linear mixed model (regression) was fitted to the experimental data. The slopes, under conventional tillage, were significant greater than zero for grain yield, harvest index, seeds per square meter, spikelet per spike and seeds per spike. Under non-tillage the list of traits showing slopes significantly greater than zero was shorter. For most traits there was a significant difference in the intercept terms between conventional tillage and non-tillage, which is interpreted as the tillage-practice effect. The concurrent evaluation in conventional and non-tillage soil managements of ten cycles of a recurrent selection program performed under conventional tillage confirmed the occurrence of a significant genetic progress only under conventional tillage.

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“…For the oat crop, the studies developed by Barbosa Neto et al (2000) in Brazil and by Redaelli et al (2008) in Italy can be emphasized. In addition, the studies with cereals from the same family as wheat (Nedel, 1994;Rodrigues et al, 2007;Cargnin et al, 2008;Oury et al, 2012;Beche et al, 2014;Thomas and Graf, 2014;Wu et al, 2014), rice (Borges et al, 2009;Breseghello et al, 1999Breseghello et al, , 2011DoVale et al, 2012), and popcorn (Ribeiro et al, 2012) can be highlighted.…”

Section: Introductionmentioning

confidence: 99%

Genetic progress in oat associated with fungicide use in Rio Grande do Sul, Brazil

et al. 2016

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ABSTRACT. The State of Rio Grande do Sul (RS) is the largest producer of oat in Brazil with the aid of consolidated breeding programs, which are constantly releasing new cultivars. The main objectives of this study were to: 1) evaluate the annual genetic progress in grain yield and hectoliter weight of the oat cultivars in RS, with and without fungicide use on aerial parts of plants; and 2) evaluate the efficiency of oat breeding programs in introducing disease-resistant genes in the released cultivars through network yield trials conducted with and without fungicide use on aerial plant parts. The data on grain yield and hectoliter weight were obtained from 89 competition field trials of oat cultivars carried out from 2007 to 2014 in nine municipalities of RS. Of the total 89 trials, 44 were carried out with fungicide application on aerial plant parts and 45 were carried out without fungicide application. The annual genetic progress in oat cultivars was studied using the methodology proposed by Vencovsky (1988). The annual genetic progress in oat grain yield was 1.02% with fungicide use and 4.02% without fungicide use during the eight-year study period in RS. The annual genetic progress with respect to the hectoliter weight was 0.08% for trials with fungicide use and 0.71% for trials without fungicide use. Performing network yield trials with and without fungicide use on the aerial plants parts is a feasible method to evaluate the efficiency of oat breeding programs in introducing disease-resistant genes in the released cultivars.

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Fifty years of wheat breeding in Southern Brazil: yield improvement and associated changes

Cited by 35 publications

References 22 publications

Characterization of brazilian wheat cultivars in terms of nitrogen use efficiency

Characterization of brazilian wheat cultivars in terms of nitrogen use efficiency

Genotype × tillage interaction in a recurrent selection program in wheat

Genetic progress in oat associated with fungicide use in Rio Grande do Sul, Brazil

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