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Development of genetic models to breed for mixed cropping systems

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Haug, Benedikt; Messmer, Monika; Forst, Emma; Mary-Huard, Tristan; Enjalbert, Jérôme; Goldringer, Isabelle and Hohmann, Pierre (2019) Development of genetic models to breed for mixed cropping systems. In: Messéan, Antoine; Drexler, Dora; Heim, Ildikó; Paresys, Lise; Stilmant, Didier and Willer, Helga (Eds.) Book of Abstracts. First European Conference on Crop Diversification, 18.-21.09.2019, Budapest, Hungary, pp. 243-244.

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Online at: https://zenodo.org/record/3516329#.XcWIN9UxlPY

Summary

Introduction
Mixed cropping, i.e. mixing different crops in the same field, provides agronomic advantages as increased productivity under low inputs conditions (e.g. for organic farming: Bedoussac et al. 2015) and higher yield stability (Raseduzzaman and Jensen 2017). In mixed cropping, choosing the right cultivars is critical for the performance of the mixture, as shown for pea-barley mixtures (Hauggaard-Nielsen and Jensen 2001) and maize-bean mixtures (Hoppe 2016). As performance in pure stand can strongly diverge from performance in mixture, estimating the ability of a cultivar to be mixed with another crop is therefore of utmost importance. For this purpose, concepts of General and Specific Combining Ability in hybrid breeding (Griffing 1956) have been adapted to cultivar and crop mixtures. Thus, these effects are called General Mixing Ability (GMA) and Specific Mixing Ability (SMA) (Federer 1993). In contrast to intraspecific mixtures, interspecific mixed cropping experiments often provide additional information, since harvested lots can be separated into their different grain fractions. Until now, statistical developments mobilizing the additional information provided by separated harvest lots to estimate mixing abilities in intercropping experiments have been neglected. The concept of Producer- and Associate-effects (abbreviated Pr and As, respectively) describes interactions between varieties sown in alternate row trials (Forst 2018). The producer effect Pr is the average performance of a cultivar grown in mixture with other crop-species, whereas the associate effect As is the average effect of a cultivar on the performance of the mixing partner. We used the fraction yields of a spring-pea (Pisum sativum L.) and spring-barley (Hordeum vulgare L.) mixed cropping experiment to determine Pr and As effects of different pea genotypes. The additional information provided by this approach is biologically more informative than GMA/SMA estimates, since it better reflects competition and facilitation occurring between different cultivars of the two crop-species.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:mixed cropping, Pisum sativum, Hordeum vulgare, plant breeding, DiverIMPACTS, crop diversification
Agrovoc keywords:
LanguageValueURI
Englishmixed croppinghttp://aims.fao.org/aos/agrovoc/c_4871
EnglishPisum sativumhttp://aims.fao.org/aos/agrovoc/c_5933
EnglishHordeum vulgarehttp://aims.fao.org/aos/agrovoc/c_3662
Englishplant breedinghttp://aims.fao.org/aos/agrovoc/c_5956
Subjects: Crop husbandry > Crop combinations and interactions
Crop husbandry > Production systems > Cereals, pulses and oilseeds
Crop husbandry > Breeding, genetics and propagation
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Plant breeding
European Union > Horizon 2020 > Diverimpacts
H2020 or FP7 Grant Agreement Number:727217
Related Links:https://www.diverimpacts.net/
Deposited By: Haug, Benedikt
ID Code:36778
Deposited On:11 Nov 2019 12:21
Last Modified:11 Nov 2019 12:21
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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