Heterotic response for grain yield and ecophysiological related traits to nitrogen availability in maize
Maize [Zea mays L.] hybrid vigor for plant grain yield [PGY] is associated with heterosis for plant biomass at maturity [aboveground biomass at physiological maturity [BiomassPM]], kernel number per plant [KNP], and harvest index [HI]; however, no evidence of the effects of nitrogen [N] availability...
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2011Munaro.pdf LINK AL EDITOR |
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| 245 | 1 | 0 | |a Heterotic response for grain yield and ecophysiological related traits to nitrogen availability in maize |
| 520 | |a Maize [Zea mays L.] hybrid vigor for plant grain yield [PGY] is associated with heterosis for plant biomass at maturity [aboveground biomass at physiological maturity [BiomassPM]], kernel number per plant [KNP], and harvest index [HI]; however, no evidence of the effects of nitrogen [N] availability or combination of abiotic stresses on heterosis for physiological components of PGY has been reported. The objective of this study was to determine the response of heterosis for ecophysiological traits related to PGY at contrasting N supply levels in a set of six inbred lines and 12 derived hybrids. Field experiments were conducted in five growing seasons at low nitrogen [LN; no N added] and high nitrogen [HN] supply [200 or 400 kg N ha-1] under irrigation and dryland farming. Increased PGY [65 percent for hybrids and 30 percent for inbreds] was ascribed to similar increase in BiomassPM as no increase in HI was found. Heterosis for PGY was higher under HN [137 percent] than LN [87 percent]. A similar response was observed for traits related to light capture and biomass accumulation. Heterosis for HI did not differ between HN [31 percent] and LN [28 percent]. Heterosis for PGY was associated [p less than 0.01] with heterosis for KNP, BiomassPM, radiation use efficiency [RUE] during grain filling, HI, and traits related to maximum light capture. Heterosis for PGY at LN was also correlated with heterosis for RUE at critical period [i.e., 30 d bracketing silking] and kernel weight. Under the combined effect of N and drought, PGY heterosis was reduced and more affected at HN [59 percent] than at LN [70 percent]. | ||
| 653 | 0 | |a ZEA MAYS | |
| 700 | 1 | |a Munaro, Eugenia María |9 35396 | |
| 700 | 1 | |9 11924 |a D'Andrea, Karina Elizabeth | |
| 700 | 1 | |9 5930 |a Otegui, María Elena | |
| 700 | 1 | |9 5928 |a Cirilo, Alfredo Gabriel | |
| 700 | 1 | |a Eyhérabide, Guillermo Hugo |9 9598 | |
| 773 | |t Crop Science |g Vol.51, no.3 (2011) p.1172-1187 | ||
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| 900 | |a ^tHeterotic response for grain yield and ecophysiological related traits to nitrogen availability in maize | ||
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| 900 | |a ^aMunaro, E.M.^tDpto. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 [C1417DSE], Ciudad de Buenos Aires, Argentina | ||
| 900 | |a ^aD'Andrea, K.E.^tConsejo Nacional de Investigaciones Científicas y Tecnológicas [CONICET], Instituto de Investigaciones Fisiológicas, Ecológicas Vinculadas a la Agricultura [IFEVA-CONICET], Argentina | ||
| 900 | |a ^aOtegui, M.E.^tInstituto Nacional de Tecnología Agropecuaria [INTA], Estación Experimental Agropecuaria Pergamino, Buenos Aires, Pergamino, Argentina | ||
| 900 | |a ^aCirilo, A.G.^t | ||
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| 900 | |a ZEA MAYS | ||
| 900 | |a Maize [Zea mays L.] hybrid vigor for plant grain yield [PGY] is associated with heterosis for plant biomass at maturity [aboveground biomass at physiological maturity [BiomassPM]], kernel number per plant [KNP], and harvest index [HI]; however, no evidence of the effects of nitrogen [N] availability or combination of abiotic stresses on heterosis for physiological components of PGY has been reported. The objective of this study was to determine the response of heterosis for ecophysiological traits related to PGY at contrasting N supply levels in a set of six inbred lines and 12 derived hybrids. Field experiments were conducted in five growing seasons at low nitrogen [LN; no N added] and high nitrogen [HN] supply [200 or 400 kg N ha-1] under irrigation and dryland farming. Increased PGY [65 percent for hybrids and 30 percent for inbreds] was ascribed to similar increase in BiomassPM as no increase in HI was found. Heterosis for PGY was higher under HN [137 percent] than LN [87 percent]. A similar response was observed for traits related to light capture and biomass accumulation. Heterosis for HI did not differ between HN [31 percent] and LN [28 percent]. Heterosis for PGY was associated [p less than 0.01] with heterosis for KNP, BiomassPM, radiation use efficiency [RUE] during grain filling, HI, and traits related to maximum light capture. Heterosis for PGY at LN was also correlated with heterosis for RUE at critical period [i.e., 30 d bracketing silking] and kernel weight. Under the combined effect of N and drought, PGY heterosis was reduced and more affected at HN [59 percent] than at LN [70 percent]. | ||
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