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Roxana Savin
University of Lleida
AnthesisBotanyAgronomyBiologyGrain growth
81Publications
31H-index
3,055Citations
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Publications 81
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#1R. Sanchez-Bragado (University of Lleida)
#2J.W. Kim (University of Lleida)
Last. Gustavo A. Slafer (University of Lleida)H-Index: 61
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Abstract The introgression of awns as a source of photoassimilates during grain filling has received has long been of particular attention in wheat. Although the benefits for average grain weight (AGW) seem consistent, those for yield still remain unclear, and the causes for the improved AGW have not been examined. In this study we carried out three field experiments. In two of them, one in CIMMYT (Mexico) and the other in Lleida (Spain), we compared awned-awnless near isogenic lines (NILs) subj...
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#1Miriam Marín-Sanz (CSIC: Spanish National Research Council)
#2María J. Giménez (CSIC: Spanish National Research Council)H-Index: 15
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Temperature and nitrogen (N) availability are two important environmental factors that may produce important changes in grain composition during grain filling of bread wheat. In this study, four wheat lines with the down-regulation of gliadins by means of RNA interference (RNAi) have been characterized to determine the effect of thermal stress and N availability on grain weight and quality; with focus on gliadin and glutenin protein fractions. Grain weight was reduced with heat stress (HS) in al...
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#1Roxana Savin (University of Lleida)H-Index: 31
#2Victor O. Sadras (University of Adelaide)H-Index: 55
Last. Gustavo A. Slafer (University of Lleida)H-Index: 61
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Abstract Water and temperature stress during critical periods of grain yield formation are distinctive of wheat crops in Mediterranean environments. However, nitrogen (N) availability may also constrain grain yields in these environments. Benchmarks of yield response to N uptake in Mediterranean conditions are lacking, and extrapolation from non-Mediterranean environments is not warranted. We hypothesised that under Mediterranean environments (1) maximum N uptake would be lower, thus the range o...
1 CitationsSource
#1Addy L. Garcia (University of Lleida)
#2Roxana Savin (University of Lleida)H-Index: 31
Last. Gustavo A. Slafer (University of Lleida)H-Index: 61
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Grain number (GN) is critical for yield determination, and understanding its physiology may be instrumental to further improving yield. Studying similarities and differences in yield physiology among cereals may highlight physiological traits that might become critical for understanding some constitutive differences between them. Recently it has been proposed that fruiting efficiency (FE, grains set per unit of inflorescence dry weight at anthesis IDWa) would be a relevant trait to further incre...
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Last. Roxana SavinH-Index: 31
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#1Roxana SavinH-Index: 31
#2Gustavo A. SlaferH-Index: 61
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#1Raziel A. Ordóñez (Iowa State University)H-Index: 6
#2Roxana Savin (University of Lleida)H-Index: 31
Last. Gustavo A. Slafer (University of Lleida)H-Index: 61
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Physiological causes for grain weight determination in maize (Zea mays L.) are not clear. Source–sink relationships during grain filling modulate grain weight, and there are controversies regarding the degree of source limitation that may exist during grain filling. We aimed to analyze likely causes of the esponsiveness of maize grain weight to defoliation and degraining treatments imposed 15 d after silking, quantifying the responsiveness of grain weight to these source–sink manipulations in a ...
1 CitationsSource
#1Gustavo A. Slafer (University of Lleida)H-Index: 61
#2Roxana Savin (University of Lleida)H-Index: 31
Deleterious effects of heat on crop yields are well documented and the occurrence of heat stresses will likely be a major constraint to achieving increased yields of major crops. Thus, agronomic and genetic strategies for increased resilience to high temperatures will be necessary. Much of the work done on this area has been focused to identify genetic sources of increased resilience and much less has been done on the crop ecology side. Nitrogen (N) fertilization is within the most common manage...
2 CitationsSource
#1Helga Ochagavía (University of Lleida)H-Index: 5
#2Paula Prieto (University of Lleida)H-Index: 5
Last. Gustavo A. Slafer (University of Lleida)H-Index: 61
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Abstract Earliness per se (Eps) genes are critical for fine-tuning flowering time and likely to modify other developmental traits as well. Effects of Eps alleles on components comprising flowering time of hexaploid wheat have not been studied. In this work, we evaluated under field conditions the effects of Eps alleles on flowering time and on a number of developmental traits using four groups of near isogenic lines (NILs) with contrasting Eps alleles (late vs early alleles). The NIL groups were...
3 CitationsSource
#1Paula Prieto (University of Lleida)H-Index: 5
#2Helga Ochagavía (University of Lleida)H-Index: 5
Last. Gustavo A. Slafer (University of Lleida)H-Index: 61
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Abstract Variations in wheat yield are largely explained by changes in grain number per m2 which is linked to the number of fertile florets at anthesis. This, in turn is the outcome of developmental processes which control floret initiation and mortality. Earliness ‘per se’ (Eps) genes are involved in fine-tuning time to anthesis in wheat (and other cereals) but their effect on development prior to anthesis is less well studied. We aimed to determine effects of Eps genes on spike fertility, quan...
4 CitationsSource
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