Heat stress in temperate and tropical maize hybrids differences in crop growth, biomass partitioning and reserves use
Maize [Zea mays L.] hybrids with tropical genetic background are a promising source of heat stress tolerance, but their performance in high yielding environments remains poorly understood. Our objective was to assess [i] genotypic differences in the ecophysiological determinants of grain yield; i.e....
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2012RattalinoEdreira.pdf LINK AL EDITOR |
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| 100 | 1 | |9 34831 |a Rattalino Edreira, Juan Ignacio | |
| 245 | 0 | 0 | |a Heat stress in temperate and tropical maize hybrids |b differences in crop growth, biomass partitioning and reserves use |
| 520 | |a Maize [Zea mays L.] hybrids with tropical genetic background are a promising source of heat stress tolerance, but their performance in high yielding environments remains poorly understood. Our objective was to assess [i] genotypic differences in the ecophysiological determinants of grain yield; i.e., fraction of light intercepted by crop [fIPAR], radiation use efficiency for biomass production [RUE], and harvest index [HI], and [ii] the responses of mentioned traits to brief episodes of high temperature. The contribution of stored reserves to grain yield was also analyzed. Field experiments included three contrasting maize hybrids [Te: temperate; Tr: tropical; TeTr: Te×Tr] grown under two temperature regimes [control and heated] during daytime hours. We tested heating [ca. 33-40°C at ear level] along three 15-d periods [GS 1: pre-silking; GS 2: from silking onwards: GS 3: active grain filling]. Heat stress had no effect on leaf area and fIPAR, but heating during grain filling affected light capture through reduced cycle duration, especially for the Te hybrid [average of -16.5 d]. Heating caused a large reduction in RUE, but this trait had a rapid recovery after heat removal and final shoot biomass was not much affected [between -3 percent and -33 percent]. HI was markedly reduced by heating and its variation was associated with changes in reserves use [r 2=0.61]. Grain yield in heated plots was better explained [r 2 greater than or equal to 0.92] by the variation in HI than by the variation in final shoot biomass [r 2 greater than or equal to 0.59]. Heat effects on grain yield were larger [i] when they occurred around flowering [-527gm -2 for GS 1 and -545gm -2 for GS 2] than during grain filling [-352gm -2 for GS 3], and [ii] for the Te hybrid [-599gm -2] than for the TeTr [-440gm -2] and the Tr hybrids [-384gm -2]. Heating around silking [GS 1 and GS 2] caused apparent accumulation of reserves during the effective grain-filling period. The opposite trend was detected among plots heated during active grain formation [GS 3]. The tropical genetic background did not penalize yield potential and conferred an enhanced capacity for enduring heat effects. | ||
| 653 | 0 | |a BIOMASS PRODUCTION | |
| 653 | 0 | |a GRAIN YIELD | |
| 653 | 0 | |a HEAT EFFECTS | |
| 653 | 0 | |a HYBRIDS | |
| 653 | 0 | |a MAIZE | |
| 653 | 0 | |a ZEA MAYS L. | |
| 653 | 0 | |a BIOMASS ALLOCATION | |
| 653 | 0 | |a CROP PRODUCTION | |
| 653 | 0 | |a CROP YIELD | |
| 653 | 0 | |a ECOPHYSIOLOGY | |
| 653 | 0 | |a GROWTH RATE | |
| 653 | 0 | |a HIGH TEMPERATURE | |
| 653 | 0 | |a LEAF AREA | |
| 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.130 (2012), p.87-98 | ||
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| 900 | |a ^tHeat stress in temperate and tropical maize hybrids^sdifferences in crop growth, biomass partitioning and reserves use | ||
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| 900 | |a ^aRattalino Edreira^bJ.I.^tInstituto de FisiologÃa y EcologÃa Vinculado a la Agricultura del Consejo, Nacional de Investigaciones CientÃficas y Tecnológicas [IFEVA-CONICET], Facultad de AgronomÃa Universidad de Buenos Aires [FAUBA], Av. San MartÃn 4453, Buenos Aires, Argentina | ||
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| 900 | |a 98 | ||
| 900 | |a BIOMASS PRODUCTION | ||
| 900 | |a GRAIN YIELD | ||
| 900 | |a HEAT EFFECTS | ||
| 900 | |a HYBRIDS | ||
| 900 | |a MAIZE | ||
| 900 | |a ZEA MAYS L. | ||
| 900 | |a BIOMASS ALLOCATION | ||
| 900 | |a CROP PRODUCTION | ||
| 900 | |a CROP YIELD | ||
| 900 | |a ECOPHYSIOLOGY | ||
| 900 | |a GROWTH RATE | ||
| 900 | |a HIGH TEMPERATURE | ||
| 900 | |a LEAF AREA | ||
| 900 | |a TEMPERATE ENVIRONMENT | ||
| 900 | |a TEMPERATURE TOLERANCE | ||
| 900 | |a TROPICAL ENVIRONMENT | ||
| 900 | |a ZEA MAYS | ||
| 900 | |a Maize [Zea mays L.] hybrids with tropical genetic background are a promising source of heat stress tolerance, but their performance in high yielding environments remains poorly understood. Our objective was to assess [i] genotypic differences in the ecophysiological determinants of grain yield; i.e., fraction of light intercepted by crop [fIPAR], radiation use efficiency for biomass production [RUE], and harvest index [HI], and [ii] the responses of mentioned traits to brief episodes of high temperature. The contribution of stored reserves to grain yield was also analyzed. Field experiments included three contrasting maize hybrids [Te: temperate; Tr: tropical; TeTr: Te×Tr] grown under two temperature regimes [control and heated] during daytime hours. We tested heating [ca. 33-40°C at ear level] along three 15-d periods [GS 1: pre-silking; GS 2: from silking onwards: GS 3: active grain filling]. Heat stress had no effect on leaf area and fIPAR, but heating during grain filling affected light capture through reduced cycle duration, especially for the Te hybrid [average of -16.5 d]. Heating caused a large reduction in RUE, but this trait had a rapid recovery after heat removal and final shoot biomass was not much affected [between -3 percent and -33 percent]. HI was markedly reduced by heating and its variation was associated with changes in reserves use [r 2=0.61]. Grain yield in heated plots was better explained [r 2 greater than or equal to 0.92] by the variation in HI than by the variation in final shoot biomass [r 2 greater than or equal to 0.59]. Heat effects on grain yield were larger [i] when they occurred around flowering [-527gm -2 for GS 1 and -545gm -2 for GS 2] than during grain filling [-352gm -2 for GS 3], and [ii] for the Te hybrid [-599gm -2] than for the TeTr [-440gm -2] and the Tr hybrids [-384gm -2]. Heating around silking [GS 1 and GS 2] caused apparent accumulation of reserves during the effective grain-filling period. The opposite trend was detected among plots heated during active grain formation [GS 3]. The tropical genetic background did not penalize yield potential and conferred an enhanced capacity for enduring heat effects. | ||
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