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Grain yield potential strategies in an elite wheat double-haploid population grown in contrasting environments

Published on Jan 1, 2013in Crop Science1.644
· DOI :10.2135/cropsci2012.11.0669
Guillermo Ariel García6
Estimated H-index: 6
(UBA: University of Buenos Aires),
Ahmed Khairul Hasan4
Estimated H-index: 4
(Austral University of Chile)
+ 3 AuthorsDaniel J. Miralles33
Estimated H-index: 33
(UBA: University of Buenos Aires)
Abstract
The understanding of ecophysiological basis of wheat (Triticum aestivum L.) grain yield poten tial provides a useful framework to comple ment conventional breeding aimed at achieving genetic gains. This study analyzed the ecophysiological performance of an elite wheat mapping population (105 double-haploid lines derived from two modern cultivars, Bacanora and Wee bil, with similar phenology but different and stable combinations of grain number per area unit (GN) and grain weight (GW) resulting in high grain yield) grown in four contrasting high-yield ing environments, to determine the most suc cessful strategies to increase grain yield poten tial. Main effect of environment on grain yield was significant ( p  0.82, p 0.51, p < 0.0001), a wide range in both components (i.e., GN and GW) was observed across all environments. This population rep resents a valuable resource for prebreeding studies, as the transgressive segregation in physiological and numerical yield components in combination with favorable expression of all agronomic traits could allow a fine phenotyping and mapping to identify key traits and quantita tive trait loci linked with grain yield.
  • References (48)
  • Citations (21)
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References48
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#1Matthew P. Reynolds (CIMMYT: International Maize and Wheat Improvement Center)H-Index: 60
#2John Foulkes (University of Nottingham)H-Index: 13
Last. Gustavo A. Slafer (Catalan Institution for Research and Advanced Studies)H-Index: 59
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Wheat provides 20% of calories and protein consumed by humans. Recent genetic gains are <1% per annum (p.a.), insufficient to meet future demand. The Wheat Yield Consortium brings expertise in photosynthesis, crop adaptation and genetics to a common breeding platform. Theory suggest radiation use efficiency (RUE) of wheat could be increased ∼50%; strategies include modifying specificity, catalytic rate and regulation of Rubisco, up-regulating Calvin cycle enzymes, introducing chloroplast CO2 con...
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#1Marta S. Lopes (CIMMYT: International Maize and Wheat Improvement Center)H-Index: 20
#2Matthew P. Reynolds (CIMMYT: International Maize and Wheat Improvement Center)H-Index: 60
Last. Michael BaumH-Index: 36
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Abstract Genetic progress in yield will increase if more traits conferring better agronomic and physiological performance are brought together in the same variety through full exploitation of genotyping and phenotyping techniques in breeding. A set of 288 spring wheat advanced lines was tested in different countries in North Africa, Western and South Asia, as well as in Mexico (total of 12 environments) to: identify high yielding germplasm adapted to the former regions; identify sources of varia...
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#1Gisela Borràs-Gelonch (University of Lleida)H-Index: 4
#2Greg J. Rebetzke (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 42
Last. Ignacio Romagosa (University of Lleida)H-Index: 37
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The duration of pre-anthesis developmental phases is of interest in breeding for improved adaptation and yield potential in temperate cereals. Yet despite numerous studies on the genetic control of anthesis (flowering) time and floral initiation, little is known about the genetic control of other pre-anthesis phases. Furthermore, little is known about the effect that changes in the duration of pre-anthesis phases could have on traits related to leaf appearance and tillering, or dry matter accumu...
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#1Guillermo Ariel García (UBA: University of Buenos Aires)H-Index: 6
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Abstract In wheat, stem elongation phase (SEP) duration is critical for grain number (GN) per unit of area determination, as it is the phase in which the spikes grow. Lengthening SEP, for instance by photoperiodic sensitivity, without altering the cycle to anthesis (AT) has been proposed as an alternative way to increase spike dry weight, and in turn GN. As most works supporting this idea have modified only SEP by artificial manipulation (e.g. photoperiod extensions), it is relevant to evaluate ...
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This review focuses on recent advances in some key areas of wheat physiology, namely phasic development, determination of potential yield and water-limited potential yield, tolerance to some other abiotic stresses (aluminium, salt, heat shock), and simulation modelling. Applications of the new knowledge to breeding and crop agronomy are emphasized. The linking of relatively simple traits like time to flowering, and aluminium and salt tolerance, in each case to a small number of genes, is being g...
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Past increases in yield potential of wheat have largely resulted from improvements in harvest index rather than increased biomass. Further large increases in harvest index are unlikely, but an opportunity exists for increasing productive biomass and harvestable grain. Photosynthetic capacity and efficiency are bottlenecks to raising productivity and there is strong evidence that increasing photosynthesis will increase crop yields provided that other constraints do not become limiting. Even small...
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A substantial increase in grain yield potential is required, along with better use of water and fertilizer, to ensure food security and environmental protection in future decades. For improvements in photosynthetic capacity to result in additional wheat yield, extra assimilates must be partitioned to developing spikes and grains and/or potential grain weight increased to accommodate the extra assimilates. At the same time, improvement in dry matter partitioning to spikes should ensure that it do...
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