Summary
Plot yields and both environmental correlations and variances of various morphological and yield characters were compared at different plant densities of lines and F1 hybrids in rapeseed over a two-year period. These variances and correlations were measured on single plant basis and are independent of the genotype: they may partly reflect physiological relations between characters.
At intermediate or low density, results indicate no significant heterogeneity for behaviour of both homozygotes and heterozygotes, with some lower correlations at very low densities. At high density hybrid vigour is significantly higher than at low or intermediate density. In heterozygotes, it is associated with reinforced correlations between morphological and yield criteria. The results are discussed with regard to seed yield elaboration, to heterosis and possible homeostasis of hybrids.
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Lefort-Buson, M., Dattee, Y. Influence of plant density on yield of homozygous and heterozygous winter rapeseed (Brassica napus L.). Euphytica 35, 823–834 (1986). https://doi.org/10.1007/BF00028590
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DOI: https://doi.org/10.1007/BF00028590