Temporal stability for unpredictable annual climatic variability for Hevea genotype selection

Gonçalves, Paulo de Souza; Moraes, Mário Luiz Teixeira de; Gouvêa, Lígia Regina Lima; Aguiar, Adriano Tosoni da Eira; Júnior, Erivaldo José Scallopi

doi:10.1590/s1516-89132008000100002

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…Genotypic stability analysis was performed following linear regression model established by Eberhart and Russell (1966): where Y ij is the mean for the genotype i at environment j ; μ is the general mean of all genotypes over all environments, b i is the regression coefficient for the i th genotype on environmental index; I j is the environmental index which is defined as the mean deviation of all genotypes at a given environment from the overall mean; δ ij is the deviation from regression for the i th genotype in j th environment; and ε ij is the mean of experimental error. As indicators of stability, the coefficient of linear regression ( b i ) and the mean square deviation from linear regression were used (Gonçalves et al. 2008, Warzecha et al.…”

Section: Methodsmentioning

confidence: 99%

Sources of resistance to Fusarium head blight within Syrian durum wheat landraces

2011

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Fusarium head blight (FHB) is a destructive disease of wheat all over the world. FHB causes high economic losses for durum wheat because of the lack of resistance sources. Initially, sixty-eight Syrian landraces were tested in field conditions after inoculation to discriminate the most resistant and environmentally stable landraces. Further tests across a total of four environments revealed four landraces with a low mean FHB rating (19-25%) compared to common German durum varieties (56-60%) and an environmentally stable resistance. They are considered as promising resistance sources to FHB for introgression in the adapted durum wheat gene pool.Fusarium head blight (FHB) caused by Fusarium graminearum Schwabe (perfect stage: Gibberella zeae (Schw.) Petch) and other Fusarium species is a common disease in all cereals including maize. Common wheat (Triticum aestivum L.) is already more susceptible and provides higher contents of the mycotoxin deoxynivalenol than triticale and rye (Miedaner and Reinbrecht 2001), but durum wheat (Triticum turgidum L. var. durum) is even more sensitive (McMullen et al. 1997, Stack et al. 2003. Deployment of FHB-resistant cultivars is considered the most effective and cost-efficient strategy to combat this disease (Miedaner 1997). Sources of effective FHB resistance have not been found in adapted durum wheat (Chen et al. 2007). No resistant durum varieties are currently available (Buerstmayr et al. 2009). Attempts to transfer the highly effective resistance loci on chromosomes 5A and 3BS from the hexaploid Chinese landrace ÔSumaiÕ 3 to durum wheat had limited success only (Kumar et al. 2007; F. Lacoudre and L. Gervais, personal communications). Resistance to FHB in tetraploid wheat has been extensively evaluated in wild emmer wheat T. turgidum L. var. dicoccoides (AABB, 2n = 4· = 28). Buerstmayr et al. (2003) tested 151 accessions from different geographical areas in Israel and Turkey and identified eight accessions with moderate FHB resistance. Similarly, Oliver et al. (2008) tested 376 accessions of five subspecies of T. turgidum and found that 16 T. turgidum subsp. carthlicum and four T. turgidum subsp. dicoccum consistently exhibited resistance or moderate resistance to FHB that was much better than observed in actual durum varieties. Four major QTL for FHB in tetraploid wheat were identified so far on chromosomes 3A (Qfhs.ndsu-3AS, Otto et al. 2002), 7A (Qfhs.fcu-7AL; Kumar et al. 2007), 6BS and 2BL (Somers et al. 2006) with the three former QTL derived from wild relatives of durum wheat or emmer. Results of Somers et al. (2006) showed that FHB resistance QTL from wild relatives can be successfully transferred to adapted durum wheat. However, breeding would be much more effective if sources of FHB resistance were found in germplasm of cultivated durum wheat. It might be promising to search such sources in regions where cultivated wheat evolutionary developed, i.e. in the Fertile Crescent. Our objective aimed (i) to analyse Syrian landraces of durum wheat for their FHB resistance b...

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Section: Methodsmentioning

confidence: 99%

Sources of resistance to Fusarium head blight within Syrian durum wheat landraces

2011

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“…Os trabalhos com estabilidade e adaptabilidade em seringueira têm sido realizados empregando-se métodos tradicionais, como a análise de variância e de regressão (Gonçalves et al, 2008(Gonçalves et al, , 2009. A aplicação do método MHPRVG é um avanço, pois se baseia em uma análise de valores genotípicos preditos via metodologia de modelos mistos.…”

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Adaptabilidade e estabilidade da produção de borracha e seleção em progênies de seringueira

Verardi

Resende

Costa

et al. 2009

Pesq. agropec. bras.

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Os objetivos deste trabalho foram determinar a interação genótipo x ambiente e a estabilidade e adaptabilidade da produção de borracha em progênies de seringueira (Hevea brasiliensis (Willd. ex A. Juss.) Müll. Arg.), bem como estimar o ganho genético com a seleção dos materiais mais produtivos. Foram utilizadas três populações de progênies de meios-irmãos de seringueira, cultivadas em três municípios do Estado de São Paulo. Os experimentos foram instalados em delineamento de blocos ao acaso com 22 progênies, 6 repetições e 10 plantas por parcela, com espaçamento de 1,5x1,5 m. Aos três anos de idade, as progênies foram avaliadas quanto à produção de borracha seca utilizando-se o teste precoce de produção Hamaker Morris-Mann. As análises de estabilidade e adaptabilidade foram obtidas por modelos lineares mistos Reml/Blup. A seleção das cinco progênies mais produtivas proporcionou ganho genético de 8,16%. A pequena variação de desempenho das progênies mais produtivas, nos três locais de plantio, indica boa estabilidade fenotípica dos genótipos. As três progênies mais produtivas apresentam superioridade de produção de 14 a 19% sobre a média geral, nos três ambientes. As progênies selecionadas nos três locais podem ser indicadas para utilização na sequência de programas de melhoramento genético e podem levar à maximização na produção de látex.

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“…When the genotype x environment interaction results in the variation of unpredictable environmental factors, such as year to year variation, as was the case in the present study, breeders need to develop more stable genotypes that can perform reasonably well in a wide range of conditions. Such breeding strategies can help rubber producers to avoid risks (Gonçalves et al, 2008 …”

Section: Resultsmentioning

confidence: 99%

Different methods to assess yield temporal stability in rubber

Gouvêa

Silva

Scaloppi

et al. 2011

Pesq. agropec. bras.

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-The objective of this work was to assess, during six years, the temporal stability of natural rubber yield of 25 superior Hevea brasiliensis genotypes, using the Wricke, Eberhart & Russell, Lin & Binns, additive main effect and multiplicative interaction (AMMI) analysis, and harmonic mean of the relative performance of the genetic values (HMRPGV) methods. The IAC 40 and IAC 300 genotypes were identified as stable and high yielding by the Eberhart & Russell, Lin & Binns, HMRPGV, and AMMI Biplot methods. The ranking of the other more stable genotypes identified by these analyses was altered. The observed results in the AMMI Biplot agreed with those observed in the Wricke method for identifying stable, but lower yielding genotypes. The simultaneous use of different methods allows a more accurate indication of stable genotypes. Stability analyses based on different principles show agreement in indicating stable genotypes.

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Temporal stability for unpredictable annual climatic variability for Hevea genotype selection

Abstract: ABSTRACT

Cited by 7 publications

References 14 publications

Sources of resistance to Fusarium head blight within Syrian durum wheat landraces

Sources of resistance to Fusarium head blight within Syrian durum wheat landraces

Adaptabilidade e estabilidade da produção de borracha e seleção em progênies de seringueira

Different methods to assess yield temporal stability in rubber

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