Abstract
In field experiments, the competition among plants of two distinct wheat genotypes in binary mixtures, and among three genotypes being grown in adjacent rows was investigated. The competition greatly affected the over-ground dry weight, weight of stem and grain per plant. This effect was undercompensatory, the depression in poor competitor was higher than the enhancement of strong competitor for all these characteristics. From final components of grain yield per plant, the number of fertile stems and number of grains per ear were more affected than weight per grain. More expressively than weight of grain on the main-stem ear, the weight of grain per average secondary ear-bearing stem was affected by competition in binary mixture. The enhancement in standard height—a strongly competitive genotype— reached in binary mixture about 10% for this last characteristic in comparison with the value from the pure stand. Some morphological characteristics of plants being in relation with competition for grain yield per plant are discussed in these experiments.
Abstract
V polních pokusech byla sledována konkurence mezi rostlinami dvou odlišných genotypů pšenice v dvousložkových směsích a mezi třemi genotypy, pěstovanými v sousedních řádcích. Konkurence značně působila na váhu sušiny nadzemní hmoty, váhu stébel a váhu zrna rostliny. Tento vliv byl podkompenzační, snížení u slabého konkurenta bylo vyšší než zvýšení silného konkurenta u všech těchto charakteristik. Z konečných složek výnosu zrna rostliny byly více ovlivněny počet produktivních stébel a počet zrn v klasu než váha jednoho zrna. Výrazněji než váha zrna klasu hlavního stébla byla konkurencí v dvousložkové smêsi ovlivněna váha zrna průměrného vedlejšího produktivního stébla. Zvýšení u standardně vysokého—silně konkurujícího genotypu—dosáhlo u posledně jmenovaného znaku ve dvousložkové směsi okolo 10% ve srovnání s hodnotou z čistého porostu. Jsou diskutovány některé morfologické charakteristiky rostliny, které jsou ve vztahu s konkurencí ve váze zrna rostliny.
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Smoček, J. Intergenotypic competition and shoot production in wheat plants. Biol Plant 16, 35–42 (1974). https://doi.org/10.1007/BF02920818
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DOI: https://doi.org/10.1007/BF02920818