Relationships Between Grain Weight and the Size of Floret Cavity in the Wheat Spike
Annals of Botany
, 1986. V. 58. No. 3. P. 417–423
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The volume of the floret cavity at different floret positions along the spike and within a single spikelet was estimated in 10 Triticum aestivum and three T. durum lines by injecting floret cavities with liquid silicone rubber which solidified thereafter. Highly significant correlation coefficients, ranging from 0.40 to 0.76 were found between floret volume and grain weight; in most lines the basal florets had a higher correlation than the terminal ones. The relationships between floret volume and grain weight were characterized by an intercept of about 30–60 per cent of the mean grain weight (heavy-grained lines having a larger intercept) and a slope of about 1 mg μI−1. Differences in grain size and shape, both within spike as well as among lines, closely reflected the variation in the size of floret cavity. The data support the hypothesis that grain weight is partly determined by the volume of the floret cavity.