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The effect of boron (B) deficiency in sunflower ( Helianthus annuus  L.) plants on early capitulum development was studied. Plants were grown under artificial conditions on an 18 h long-day photoperiod in B-deficient soil mixture (&lt;0.1 ppm B) irrigated with B-deficient or complete Hoagland’s solution (0.27 ppm B). B-deficient plants were transferred 25 days after seedling emergence (DAE) to a B-rich soil mixture (2.0 ppm B) and irrigated with complete B Hoagland’s solution.

helia

INITIATION AND DIFFERENTIATION OF FLORET PRIMORDIA IN NATURALLY WOUNDED CAPITULA OF BORON DEFICIENT SUNFLOWER (Helianthus annuus L.) PLANTS / INICIACIÓN Y DIFERENCIACIÓN DE LOS PRIMORDIOS FLORALES EN CAPÍTULOS DE PLANTAS DE GIRASOL (Helianthus annuus L.) DEFICIENTES EN BORO / INITIATION ET DIFFÉRENTIATION DES PRIMODIA DANS LES CAPITULES DES PLANTES DE TOURNESOL (Helianthus annuus L.) DEFITIENS EN BORE