Vol. 70 No: 1

Title:
Variations in the Number of Beans Per Pod in Theobroma Cacao L. in the Ivory Coast. II. Pollen Germination, Fruit Setting and Ovule Development

Author:
P. LACHENAUD

pp: 1-6

Abstract:
The stages between pollen germination and ovule development were examined in an attempt to explain the incomplete pod filling frequently seen in the Ivory Coast. Pollens from Upper Amazon clones, which are subject to incomplete pod filling, reveal germination and rates identical with those of the Amelonado control. The boron content of the styles and stigmas, which is known to affect pollen germination, is similar in both types of planting material. Flowers with a set ovary constitute only a tiny percentage (0.1 to 0.46) of fallen flowers, which confirms that flowers pollinated with sparse grains fall without setting. For fruit setting occurring at the same time on the same trees, wilted c[...]re[...] contain significantly more fertilized ovules than pods do beans. It can be deduced what the drop in the number of beans per fruit occurs mainly after physiological [...].

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