Heat stress effects around flowering on kernel set of temperate and tropical maize hybrids

Final kernel number in the uppermost ear of temperate maize [Zea mays L.] hybrids is smaller than the potential represented by the number of florets differentiated in this ear, and than the number of silks exposed from it [i.e., kernel set less than1]. This trend increases when stressful conditions...

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Detalles Bibliográficos
Otros Autores: Rattalino Edreira, Juan Ignacio, Budakli Carpici, E., Sammarro, Damián Gustavo, Otegui, María Elena
Formato: Artículo
Lenguaje:Inglés
Materias:
FLOWERING DYNAMICS
GENOTYPES
HEAT STRESS
KERNEL SET
MAIZE
SILK EXPOSURE DYNAMICS
AGRICULTURAL LAND
FIELD SURVEY
FLOWERING
GENOTYPE
GROWTH RATE
HEAT SHOCK
HEATING
HYBRID
POLLINATION
TROPICAL ENVIRONMENT
ZEA MAYS
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011RattalinoEdreira.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Heat stress effects around flowering on kernel set of temperate and tropical maize hybrids 
520 |a Final kernel number in the uppermost ear of temperate maize [Zea mays L.] hybrids is smaller than the potential represented by the number of florets differentiated in this ear, and than the number of silks exposed from it [i.e., kernel set less than1]. This trend increases when stressful conditions affect plant growth immediately before [GS1] or during [GS2] silking, but the magnitude of change has not been documented for heat stress effects and hybrids of tropical background. In this work we evaluated mentioned traits in field experiments [Exp1 and Exp2], including [i] two temperature regimes, control and heated during daytime hours [ca. 33-40°C at ear level], [ii] two 15-d periods during GS1 and GS2, and [iii] three hybrids [Te: temperate; Tr: tropical; TeTr: Te x Tr]. We also measured crop anthesis and silking dynamics, silk exposure of individual plants, and the anthesis-silking interval [ASI]. Three sources of kernel loss were identified: decreased floret differentiation, pollination failure, and kernel abortion. Heating affected all surveyed traits, but negative effects on flowering dynamics were larger [i] for anthesis than for silking with the concomitant decrease in ASI, and [ii] for GS1 than for GS2. Heat also caused a decrease in the number of [i] florets only when performed during GS1 [-15.5 percent in Exp1 and -9.1 percent in Exp2], and only among Te and TeTr hybrids, [ii] exposed silks of all GS x Hybrid combinations, and [iii] harvestable kernels [mean of -51.8 percent in GS1 and -74.5 percent in GS2]. Kernel abortion explained 95 percent of the variation in final kernel numbers [P less than 0.001], and negative heat effects were larger on this loss [38.6 percent] than on other losses [less or equal than 11.3 percent]. The tropical genetic background conferred an enhanced capacity for enduring most negative effects of heating. 
653 0 |a FLOWERING DYNAMICS 
653 0 |a GENOTYPES 
653 0 |a HEAT STRESS 
653 0 |a KERNEL SET 
653 0 |a MAIZE 
653 0 |a SILK EXPOSURE DYNAMICS 
653 0 |a AGRICULTURAL LAND 
653 0 |a FIELD SURVEY 
653 0 |a FLOWERING 
653 0 |a GENOTYPE 
653 0 |a GROWTH RATE 
653 0 |a HEAT SHOCK 
653 0 |a HEATING 
653 0 |a HYBRID 
653 0 |a POLLINATION 
653 0 |a TROPICAL ENVIRONMENT 
653 0 |a ZEA MAYS 
700 1 |9 34831  |a Rattalino Edreira, Juan Ignacio 
700 1 |a Budakli Carpici, E.  |9 69474 
700 1 |a Sammarro, Damián Gustavo  |9 38367 
700 1 |9 5930  |a Otegui, María Elena 
773 |t Field Crops Research  |g Vol.123, no.2 (2011), p.62-73 
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900 |a ^tHeat stress effects around flowering on kernel set of temperate and tropical maize hybrids 
900 |a ^aRattalino Edreira^bJ.I. 
900 |a ^aBudakli Carpici^bE. 
900 |a ^aSammarro^bD. 
900 |a ^aOtegui^bM.E. 
900 |a ^aRattalino Edreira^bJ. I. 
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900 |a ^aSammarro^bD. 
900 |a ^aOtegui^bM. E. 
900 |a ^aRattalino Edreira, J.I.^tInstituto de Fisiología, Ecologia Vinculado a la Agricultura del Consejo Nacional de Investigaciones, Cientificas y Tecnologicas [IFEVA-CONICET], Facultad de Agronomia Universidad de Buenos Aires [FAUBA], Av. San Martín 4453, Buenos Aires, Argentina 
900 |a ^aBudakli Carpici, E.^tDepartamento de Producción Vegetal, FAUBA, Argentina 
900 |a ^aSammarro, D.^tDepartment of Field Crops, Faculty of Agriculture, Uludag University, 16059 Bursa, Turkey 
900 |a ^aOtegui, M.E.^t 
900 |a ^tField Crops Research^cField Crops Res. 
900 |a en 
900 |a 62 
900 |a ^i 
900 |a Vol. 123, no. 2 
900 |a 73 
900 |a FLOWERING DYNAMICS 
900 |a GENOTYPES 
900 |a HEAT STRESS 
900 |a KERNEL SET 
900 |a MAIZE 
900 |a SILK EXPOSURE DYNAMICS 
900 |a AGRICULTURAL LAND 
900 |a FIELD SURVEY 
900 |a FLOWERING 
900 |a GENOTYPE 
900 |a GROWTH RATE 
900 |a HEAT SHOCK 
900 |a HEATING 
900 |a HYBRID 
900 |a POLLINATION 
900 |a TROPICAL ENVIRONMENT 
900 |a ZEA MAYS 
900 |a Final kernel number in the uppermost ear of temperate maize [Zea mays L.] hybrids is smaller than the potential represented by the number of florets differentiated in this ear, and than the number of silks exposed from it [i.e., kernel set less than1]. This trend increases when stressful conditions affect plant growth immediately before [GS1] or during [GS2] silking, but the magnitude of change has not been documented for heat stress effects and hybrids of tropical background. In this work we evaluated mentioned traits in field experiments [Exp1 and Exp2], including [i] two temperature regimes, control and heated during daytime hours [ca. 33-40°C at ear level], [ii] two 15-d periods during GS1 and GS2, and [iii] three hybrids [Te: temperate; Tr: tropical; TeTr: Te x Tr]. We also measured crop anthesis and silking dynamics, silk exposure of individual plants, and the anthesis-silking interval [ASI]. Three sources of kernel loss were identified: decreased floret differentiation, pollination failure, and kernel abortion. Heating affected all surveyed traits, but negative effects on flowering dynamics were larger [i] for anthesis than for silking with the concomitant decrease in ASI, and [ii] for GS1 than for GS2. Heat also caused a decrease in the number of [i] florets only when performed during GS1 [-15.5 percent in Exp1 and -9.1 percent in Exp2], and only among Te and TeTr hybrids, [ii] exposed silks of all GS x Hybrid combinations, and [iii] harvestable kernels [mean of -51.8 percent in GS1 and -74.5 percent in GS2]. Kernel abortion explained 95 percent of the variation in final kernel numbers [P less than 0.001], and negative heat effects were larger on this loss [38.6 percent] than on other losses [less or equal than 11.3 percent]. The tropical genetic background conferred an enhanced capacity for enduring most negative effects of heating. 
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