Abstract
Shading or nitrogen shortage were applied either continuously or removed at selected developmental stages, to single-stemmed plants of wheat. The number of competent florets was linked to both the ear growth rate and the plant growth potential before meiosis. Grain setting of these florets was also correlated with the ear growth rate before anthesis, suggesting that the competitiveness of competent florets was affected by conditions experienced during their formation. Therefore the ear fertility integrates previous history of the plant. From meiosis on ward, the growth of starved plants and the recovery of those re-supplied was better after a shading period than after nitrogen shortage. The growth of the ear did not seem to be hampered by the growth of the vegetative parts of the shoot.
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