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  • Author or Editor: Ismat Al-Shalan x
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Abstract

Markedly different curves of growth of the pistachio nut were obtained when increases in cross-diameter, fresh weight and dry weight were plotted. The dry weight data indicated that carbohydrates are not involved in abscission of inflorescence buds and resulting alternate bearing, as previously reported.

The predominant sugar in the kernel was sucrose, followed in decreasing order by glucose, fructose, and inositol (a sugar alcohol). Total sugars reached a peak of 43.3% of the dry weight early in development of the kernel, but then decreased to 7% at nut maturity. Concomitantly, crude fat increased from a low of 3.2% early in kernel development to a maximum of 40.1% at maturity.

Open Access

Abstract

Abscission of inflorescence buds increased progressively as leaf area decreased or number of nuts per branch increased. The data strongly indicate that dominance of the developing seed over the inflorescence buds in competition for carbohydrates might be responsible for bud abscission. However, the possible involvement of a hormone(s) originating in the leaves should not be overlooked.

Open Access