Heat stress in temperate and tropical maize hybrids a novel approach for assessing sources of kernel loss in field conditions
Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly understood. Our objectives were [i] to assess the sources of kernel loss, and [ii] to identify the main differences in these traits among genotypes of contrasting...
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2013rattalinoedreira.pdf LINK AL EDITOR |
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| 100 | 1 | |a Rattalino Edreira, Juan Ignacio |9 34831 | |
| 245 | 0 | 0 | |a Heat stress in temperate and tropical maize hybrids |b a novel approach for assessing sources of kernel loss in field conditions |
| 520 | |a Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly understood. Our objectives were [i] to assess the sources of kernel loss, and [ii] to identify the main differences in these traits among genotypes of contrasting genetic background. We used the classic relationships that associate final kernel number per plant [KNP] with plant [PGRCP] and ear [EGRCP] growth rates during the critical period for kernel set and developed an alternative approach based on the combined analysis of these relationships for assessing sources of kernel loss in field conditions. We identified three sources of loss associated with [i] PGRCP reductions [deltaKNP1], [ii] changes in biomass partitioning to the ear [deltaKNP2], and [iii] constraints not directly related to assimilate allocation to the ear [deltaKNP3]. A partitioning index was also established [PI=EGRCP PGRCP -1]. Field experiments included three contrasting maize hybrids [Te: temperate; Tr: tropical; TeTr: Te xTr] grown under two temperature regimes [control and heated] during daytime hours. We tested heating [ca. 33-40°C at ear level] along two 15-d periods [GS1: pre-anthesis; GS2: from silking onwards]. Final KNP was severely reduced by heating, and this negative effect was larger [i] when it occurred during silking [-75 percent for GS2] than before anthesis [-52 percent for GS1], and [ii] for the Te hybrid [-77 percent] than the TeTr [-69 percent] and the Tr [-44 percent] hybrids. The contribution of each source of loss to the decrease in KNP was 47 percent for deltaKNP1, 27 percent for deltaKNP2, and 32 percent for deltaKNP3. Variations in deltaKNP2 were explained by changes in PI [r2 =0.85, P less than 0.001], and a critical PI value [0.25] for avoiding kernel loss due to deltaKNP2 was established. A similar pattern among genotypes was found for the response of KNP to variations in both PGRCP and EGRCP, but the new approach indicated that enhanced tolerance of the tropical genotype was mainly associated with reduced deltaKNP3. | ||
| 653 | 0 | |a HEAT STRESS | |
| 653 | 0 | |a KERNEL NUMBERS | |
| 653 | 0 | |a KERNEL SET | |
| 653 | 0 | |a MAIZE | |
| 653 | 0 | |a TEMPERATE AND TROPICAL HYBRIDS | |
| 653 | 0 | |a ZEA MAYS [L] | |
| 653 | 0 | |a BIOMASS ALLOCATION | |
| 653 | 0 | |a ECOPHYSIOLOGY | |
| 653 | 0 | |a FIELD SURVEY | |
| 653 | 0 | |a HYBRID | |
| 653 | 0 | |a TEMPERATE ENVIRONMENT | |
| 653 | 0 | |a TEMPERATURE TOLERANCE | |
| 653 | 0 | |a TROPICAL ENVIRONMENT | |
| 653 | 0 | |a ZEA MAYS | |
| 700 | 1 | |9 5930 |a Otegui, María Elena | |
| 773 | |t Field Crops Research |g vol.142 (2013), p.58-67 | ||
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| 900 | |a ^tHeat stress in temperate and tropical maize hybrids^sA novel approach for assessing sources of kernel loss in field conditions | ||
| 900 | |a ^aRattalino Edreira^bJ.I. | ||
| 900 | |a ^aOtegui^bM.E. | ||
| 900 | |a ^aRattalino Edreira^bJ. I. | ||
| 900 | |a ^aOtegui^bM. E. | ||
| 900 | |a ^aRattalino Edreira, J.I.^tIFEVA-CONICET, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Buenos Aires, Argentina | ||
| 900 | |a ^aRattalino Edreira, J.I.^tFacultad de Agronomía, Universidad Nacional de La Pampa, CC 300, RA 6300 Santa Rosa, LP, Argentina | ||
| 900 | |a ^aOtegui, M.E.^tIFEVA-CONICET, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Buenos Aires, Argentina | ||
| 900 | |a ^tField Crops Research^cField Crops Res. | ||
| 900 | |a en | ||
| 900 | |a 58 | ||
| 900 | |a ^i | ||
| 900 | |a Vol. 142 | ||
| 900 | |a 67 | ||
| 900 | |a HEAT STRESS | ||
| 900 | |a KERNEL NUMBERS | ||
| 900 | |a KERNEL SET | ||
| 900 | |a MAIZE | ||
| 900 | |a TEMPERATE AND TROPICAL HYBRIDS | ||
| 900 | |a ZEA MAYS [L] | ||
| 900 | |a BIOMASS ALLOCATION | ||
| 900 | |a ECOPHYSIOLOGY | ||
| 900 | |a FIELD SURVEY | ||
| 900 | |a HYBRID | ||
| 900 | |a TEMPERATE ENVIRONMENT | ||
| 900 | |a TEMPERATURE TOLERANCE | ||
| 900 | |a TROPICAL ENVIRONMENT | ||
| 900 | |a ZEA MAYS | ||
| 900 | |a Temperate and tropical maize differ in their tolerance to heat stress but the ecophysiological bases for genotypic differences are poorly understood. Our objectives were [i] to assess the sources of kernel loss, and [ii] to identify the main differences in these traits among genotypes of contrasting genetic background. We used the classic relationships that associate final kernel number per plant [KNP] with plant [PGRCP] and ear [EGRCP] growth rates during the critical period for kernel set and developed an alternative approach based on the combined analysis of these relationships for assessing sources of kernel loss in field conditions. We identified three sources of loss associated with [i] PGRCP reductions [deltaKNP1], [ii] changes in biomass partitioning to the ear [deltaKNP2], and [iii] constraints not directly related to assimilate allocation to the ear [deltaKNP3]. A partitioning index was also established [PI=EGRCP PGRCP -1]. Field experiments included three contrasting maize hybrids [Te: temperate; Tr: tropical; TeTr: Te xTr] grown under two temperature regimes [control and heated] during daytime hours. We tested heating [ca. 33-40°C at ear level] along two 15-d periods [GS1: pre-anthesis; GS2: from silking onwards]. Final KNP was severely reduced by heating, and this negative effect was larger [i] when it occurred during silking [-75 percent for GS2] than before anthesis [-52 percent for GS1], and [ii] for the Te hybrid [-77 percent] than the TeTr [-69 percent] and the Tr [-44 percent] hybrids. The contribution of each source of loss to the decrease in KNP was 47 percent for deltaKNP1, 27 percent for deltaKNP2, and 32 percent for deltaKNP3. Variations in deltaKNP2 were explained by changes in PI [r2 =0.85, P less than 0.001], and a critical PI value [0.25] for avoiding kernel loss due to deltaKNP2 was established. A similar pattern among genotypes was found for the response of KNP to variations in both PGRCP and EGRCP, but the new approach indicated that enhanced tolerance of the tropical genotype was mainly associated with reduced deltaKNP3. | ||
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