SUNFLO, a model to simulate genotype-specific performance of the sunflower crop in contrasting environments

被引:66
|
作者
Casadebaig, Pierre [1 ]
Guilioni, Lydie [2 ]
Lecoeur, Jeremie [2 ]
Christophe, Angelique [3 ]
Champolivier, Luc [4 ]
Debaeke, Philippe [1 ]
机构
[1] INRA, AGIR, UMR 1248, F-31326 Castanet Tolosan, France
[2] Montpellier SupAgro, LEPSE, UMR 759, F-34060 Montpellier, France
[3] INRA, LEPSE, UMR 759, F-34060 Montpellier, France
[4] Ctr INRA Toulouse, CETIOM, F-31326 Castanet Tolosan, France
关键词
Crop model; Genotypic variability; Water stress; Nitrogen stress; Yield; Oil content; Sunflower (Helianthus annuus L.); NITROGEN MINERALIZATION; GENETIC COEFFICIENTS; LEAF EXPANSION; HARVEST INDEX; OIL QUALITY; STAY-GREEN; YIELD; GROWTH; PLANT; SOIL;
D O I
10.1016/j.agrformet.2010.09.012
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Yield improvement certainly depends on breeding new genotypes, but also on identifying the best genotype for a given location and crop management system. Hence we need to quickly evaluate the performance of each new variety in different cropping systems and environmental conditions. Our objective was to develop a model (SUNFLO) which can help to improve genotypic assessment in the sunflower crop. The present work aimed at identifying, quantifying and modelling the phenotypic variability of crop performance in response to the main abiotic stresses occurring in the field (light, temperature, water, nitrogen) but also in the expression of genotypic variability. We therefore include just enough genetic information to enable the model to be used with new genotypes. Each genotype was thus defined by chosen phenotypic traits which were transcribed into a set of 12 genotype-specific parameters. The model's performance was evaluated in both specific field experiments and generic multi-environment trials (MET). The first evaluation assessed model robustness: no variables had a large prediction error, indicating that the final output error results more from poor prediction for all variables than from error compensation. An ANOVA on the simulated MET dataset showed that although the model simulates less variability than in reality (60%), there was genotype-environment interaction and the ranking of the ANOVA factors was identical in both observed and simulated networks. The model's accuracy was sufficient to discriminate between genotypes from different breeding periods, but was similar to the difference in performance between actual genotypes (similar to 0.2 t ha(-1)). To improve the understanding of crop physiology and crop-environment interactions, this kind of model shows weaknesses, especially when dealing with environmental stress integration or biomass allocation. On the other hand, SUNFLO seems sufficiently robust to estimate the influence on yield of breeding traits or to explore new management practices. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:163 / 178
页数:16
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