Reproductive Anatomy of the Grape-vine (Vitis vinifera L.): Origin and Development of the Anlage and its Derivatives

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Abstract
The origin and development of anlagen (undifferentiated primordia), inflorescences, tendrils and flowers in the grape cv. Shiraz has been investigated by scanning electron microscopy. Anlagen arise terminally by bisection of the apex of the so-called latent bud. The axis of the latent bud is continued by the original apex and anlagen are displaced laterally. Micrographs presented here favour the interpretation of the grape-vine shoot as a monopodium. Anlagen formed distal to the 10th node of container grown vines formed inflorescence primordia when plants were grown at high temperatures (33°C day-28°C night). At lower temperatures (21°C day, 16°C night or 18°Cday, 13°C night) anlagen formed distal to the 10th node grew into tendril primordia. At basal nodes anlagen gave rise to shoot primordia. Each branch of the highly-divided inflorescence primordium of Shiraz forms five flower primordia. Flower development is discussed.

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