Heterosis x environment interaction in maize what drives heterosis for grain yield?
Variation in mean heterosis over a range of environments is expected when maize hybrids and inbred lines respond differently to environmental stimuli. However, the magnitude and nature of the heterosis x environment interaction [H x E] has not been adequately described. The objectives of this work w...
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2011Munaro2.pdf LINK AL EDITOR |
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| 245 | 1 | 0 | |a Heterosis x environment interaction in maize |b what drives heterosis for grain yield? |
| 520 | |a Variation in mean heterosis over a range of environments is expected when maize hybrids and inbred lines respond differently to environmental stimuli. However, the magnitude and nature of the heterosis x environment interaction [H x E] has not been adequately described. The objectives of this work were to determine [i] the effects of environmental variability on the expression of heterosis for plant grain yield [PGY] and related ecophysiological traits and [ii] to what extent H x E is of general importance for the expression of heterosis for these traits. Field experiments included a set of six inbred lines and twelve derived hybrids grown in 14 environments [year x nitrogen x water regime combinations] in the temperate region of Argentina. Main physiological and quantitative determinants of PGY were measured and mid parent heterosis [MPH] computed for each trait. Genotype x environment interaction was investigated using the joint regression analysis. For PGY, hybrids had a significant but moderate association between sensitivity to the environment and mean genotype value, whereas inbred lines did not show association. For harvest index [HI] hybrids showed greater mean values than inbreds, however, regression coefficients of both genotype groups tended to overlap slightly. A decrease in environmental quality led to a decline in the expression of heterosis for PGY but not for HI. A bilinear with plateau model adequately described the association between heterosis for PGY and environmental quality, because a threshold value was detected beyond which further increases in environment mean did not translate into higher heterosis for PGY. A similar response pattern was found between PGY MPH and biomass at physiological maturity [BiomassPM] MPH. Despite the greater heterosis for BiomassPM, further increases in PGY MPH could not be realized above a threshold value of 115gpl-1 for BiomassPM MPH. HI MPH was the major factor that set a limit to PGY MPH under favorable environments. | ||
| 653 | 0 | |a ENVIRONMENT | |
| 653 | 0 | |a GENOTYPES | |
| 653 | 0 | |a GRAIN YIELD | |
| 653 | 0 | |a HETEROSIS | |
| 653 | 0 | |a BIOMASS | |
| 653 | 0 | |a CROP YIELD | |
| 653 | 0 | |a ECOPHYSIOLOGY | |
| 653 | 0 | |a ENVIRONMENTAL QUALITY | |
| 653 | 0 | |a GENOTYPE-ENVIRONMENT INTERACTION | |
| 653 | 0 | |a HYBRID | |
| 653 | 0 | |a INBREEDING | |
| 653 | 0 | |a MAIZE | |
| 653 | 0 | |a PHYSIOLOGICAL RESPONSE | |
| 653 | 0 | |a QUANTITATIVE ANALYSIS | |
| 653 | 0 | |a REGRESSION ANALYSIS | |
| 653 | 0 | |a ARGENTINA | |
| 653 | 0 | |a ZEA MAYS | |
| 700 | 1 | |9 35396 |a Munaro, Eugenia María | |
| 700 | 1 | |9 9598 |a Eyhérabide, Guillermo Hugo | |
| 700 | 1 | |9 11924 |a D'Andrea, Karina Elizabeth | |
| 700 | 1 | |9 5928 |a Cirilo, Alfredo Gabriel | |
| 700 | 1 | |9 5930 |a Otegui, María Elena | |
| 773 | |t Field Crops Research |g Vol.124, no.3 (2011), p.441-449 | ||
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| 900 | |a ^tHeterosis x environment interaction in maize^swhat drives heterosis for grain yield? | ||
| 900 | |a ^aMunaro^bE.M. | ||
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| 900 | |a ^aCirilo^bA.G. | ||
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| 900 | |a ^aMunaro^bE. M. | ||
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| 900 | |a ^aOtegui^bM. E. | ||
| 900 | |a ^aMunaro^bE.M.^tDpto. de Producción Vegetal, Facultad de AgronomÃa, Universidad de Buenos Aires, Av. San MartÃn 4453 [C1417DSE], Ciudad de Buenos Aires, Argentina | ||
| 900 | |a ^aEyhérabide^bG.H.^tInstituto Nacional de TecnologÃa Agropecuaria [INTA], Estación Experimental Agropecuaria Pergamino, Buenos Aires, Pergamino, Argentina | ||
| 900 | |a ^aD'Andrea^bK.E.^tConsejo Nacional de Investigaciones CientÃficas y Tecnológicas [CONICET], Argentina | ||
| 900 | |a ^aCirilo^bA.G.^tIFEVA, CONICET, Argentina | ||
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| 900 | |a Vol. 124, no. 3 | ||
| 900 | |a 449 | ||
| 900 | |a ENVIRONMENT | ||
| 900 | |a GENOTYPES | ||
| 900 | |a GRAIN YIELD | ||
| 900 | |a HETEROSIS | ||
| 900 | |a BIOMASS | ||
| 900 | |a CROP YIELD | ||
| 900 | |a ECOPHYSIOLOGY | ||
| 900 | |a ENVIRONMENTAL QUALITY | ||
| 900 | |a GENOTYPE-ENVIRONMENT INTERACTION | ||
| 900 | |a HYBRID | ||
| 900 | |a INBREEDING | ||
| 900 | |a MAIZE | ||
| 900 | |a PHYSIOLOGICAL RESPONSE | ||
| 900 | |a QUANTITATIVE ANALYSIS | ||
| 900 | |a REGRESSION ANALYSIS | ||
| 900 | |a ARGENTINA | ||
| 900 | |a ZEA MAYS | ||
| 900 | |a Variation in mean heterosis over a range of environments is expected when maize hybrids and inbred lines respond differently to environmental stimuli. However, the magnitude and nature of the heterosis x environment interaction [H x E] has not been adequately described. The objectives of this work were to determine [i] the effects of environmental variability on the expression of heterosis for plant grain yield [PGY] and related ecophysiological traits and [ii] to what extent H x E is of general importance for the expression of heterosis for these traits. Field experiments included a set of six inbred lines and twelve derived hybrids grown in 14 environments [year x nitrogen x water regime combinations] in the temperate region of Argentina. Main physiological and quantitative determinants of PGY were measured and mid parent heterosis [MPH] computed for each trait. Genotype x environment interaction was investigated using the joint regression analysis. For PGY, hybrids had a significant but moderate association between sensitivity to the environment and mean genotype value, whereas inbred lines did not show association. For harvest index [HI] hybrids showed greater mean values than inbreds, however, regression coefficients of both genotype groups tended to overlap slightly. A decrease in environmental quality led to a decline in the expression of heterosis for PGY but not for HI. A bilinear with plateau model adequately described the association between heterosis for PGY and environmental quality, because a threshold value was detected beyond which further increases in environment mean did not translate into higher heterosis for PGY. A similar response pattern was found between PGY MPH and biomass at physiological maturity [BiomassPM] MPH. Despite the greater heterosis for BiomassPM, further increases in PGY MPH could not be realized above a threshold value of 115gpl-1 for BiomassPM MPH. HI MPH was the major factor that set a limit to PGY MPH under favorable environments. | ||
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