Mixture performance of phenotypically contrasting barley cultivars

Essah, S. Y. C.; Stoskopf, N. C.

doi:10.4141/p01-043

Cited by 20 publications

(13 citation statements)

References 13 publications

(10 reference statements)

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“…light regimes in the altered canopies), very little is known about trait plasticity in cultivar mixtures and the extent to which this affects plant growth and development, and in turn cultivar interaction and mixture performance. Essah and Stoskopf (2002) studied mixture performance of barley cultivars with different plant heights. They found a yield advantage compared with pure stands, but not in all combinations.…”

Section: Introductionmentioning

confidence: 99%

Plasticity of barley in response to plant neighbors in cultivar mixtures

et al. 2019

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Aims Cultivar mixtures can increase productivity through complementarity in resource use, but reported results are often conflicting and the role of plasticity in shaping plant-plant interactions is poorly understood. We aim to determine if individual cultivars show different phenotypic responses when grown in a mixture, whether these responses depend on the neighboring cultivar identity, and how they contribute to variations in productivity and nitrogen (N) use. Methods Five spring barley cultivars were field-grown in pure stands and in mixtures during 2 years. Plant traits related to development, growth, N use, and reproduction were measured to identify temporal patterns of plastic responses to neighboring plants. Results Plants in mixtures were shorter and developed slower early in the season, but later on they grew faster and produced more grain than the corresponding pure stands. Some cultivars showed complementary N accumulation only when grown together with specific neighbors. Mechanisms of improved productivity differed between the individual mixtures. Conclusions Plastic plant-plant interaction between cultivars is an important driver behind the variability in mixing effects. Results contribute to a better understanding of how productivity in cultivar mixtures is affected by plastic adaptation and differentiation of plant traits, depending on the environment created by neighboring genotypes.

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Section: Introductionmentioning

confidence: 99%

Plasticity of barley in response to plant neighbors in cultivar mixtures

et al. 2019

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“…Juskiw et al (2001) also reported that barley cultivar mixtures had no yield advantage over growing a highly productive mono-cultivar crop. Nevertheless, Essah and Stoskopf (2002) found that mixtures of phenotypically different barley cultivars can produce yield advantages over mono-cultivar crops. Although we attempted to maximize diversity in our experiment, barley cultivars were still randomly chosen and were not purposely selected for contrasting (or similar) traits.…”

Section: Resultsmentioning

confidence: 99%

“…For example, studies have shown that barley (Hordeum vulgare L.) grown in mixtures of different cultivars can produce yield advantages over barley grown in monocultures (e.g., Essah and Stoskopf 2002); however, many of the benefits derived from cereal varietal mixtures can be attributed to improved pathogen and pest control (Finckh et al 2000;Cox et al 2004).…”

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confidence: 99%

The agronomic value of annual plant diversity in crop-weed systems

Szumigalski¹,

Acker²

2006

Can. J. Plant Sci.

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. The agronomic value of annual plant diversity in crop-weed systems. Can. J. Plant Sci. 86: 865-874. Enhanced crop or cultivar diversity within annual cropping systems could provide important ecological and agronomic benefits. The agronomic effects of annual plant diversity from mixtures of crop species and barley (Hordeum vulgare L.) cultivar types were compared using richness levels of 1, 2, 5 or 10 randomly selected taxa in a greenhouse experiment. Increasing crop richness increased overall crop dry matter production, production stability (i.e., decreased CV for dry matter production) and weed suppression. These agronomic variables tended to level off after a richness of five to six crop species, suggesting that further increases in crop diversity are redundant. Increasing barley cultivar richness increased crop production in one of two experimental runs, but no effects were observed for weed suppression. Increased light interception related to greater plant canopy height variation in diverse mixtures of species could have contributed to increased productivity in the crop richness experiment. The results of this study suggest that the ecological functions of diversity provide productivity, yield stability and weed suppression benefits for mixtures of crop species, and even perhaps for mixtures of cultivars within a given crop species. ) en comparant leur degré de diversité (1, 2, 5 ou 10 taxons sélectionnés au hasard). Une meilleure diversité accroît la production globale de matière sèche par la culture, stabilise la production (à savoir, diminue le coefficient de variation de la production de matière sèche) et supprime les mauvaises herbes. Ces variables agronomiques ont tendance à atteindre un plateau lorsqu'on arrive à cinq ou six espèces, signe qu'il serait redondant d'augmenter la diversité davantage. La multiplication des cultivars d'orge a relevé la production végétale lors d'un essai sur deux, mais les auteurs n'ont rien noté au niveau de la suppression des mauvaises herbes. La hauteur plus variable du feuillage dans les mélanges d'espèces entraîne une plus forte interception de la lumière, ce qui pourrait expliquer la productivité supérieure observée lors de l'expérience. Les résultats de l'étude laissent croire que, sur le plan écologique, la diversité est bénéfique à la productivité, à la stabilité du rendement et à la lutte contre les adventices dans les mélanges d'espèces cultivées voire de cultivars d'une même espèce.

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“…Using non-elite spring germplasm, such as doubled-haploid lines from a mapping population segregating for two dwarfing genes grown in mixtures, yield enhancement of even two-component mixtures of lines differing in dwarfing genes was 6.6% and for three-components was 9.9% (Newton et al 2004). The strategy of complementing cultivars with contrasting traits was demonstrated using Canadian barley cultivars differing in height and maturity date, illustrating not only the potential for yield enhancement with appropriate combinations, but also some which can lead to negative interactions (Essah and Stoskopf 2002). The resulting canopy structure will affect not only resource utilisation and competition between components and with weeds, but also the environment for infection and transmission of pathogens.…”

Section: Trials and On-farm Usementioning

confidence: 99%