Abstract
Abstract The influence of size and pericarp structure of sunflower ( Helianthus annuus L.) fruits on imhibition and germination rates of the seed was investigated. The results show a positive correlation between fruit width, pericarp thickness and fruit weight. Germination rate was not affected by fruit size. Nevertheless, although large fruits (more than 4.5 mm width) have a rapid imbibition rate there was a significant lag in the start of their germination in relation to that of the smaller fruits (less than 2.5 mm width).
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