![]() ![]() the shoot apex ceases to produce leaf primordia and initiates the inflorescence onion. It is concluded that temperature influences fruitfulness of grapevine buds by effects on tissues which exist prior to, and which are subsequently situated basal to, a fruit primordium. Inside the leaves is a small central bud at the tip of the stem. It is at this stage that the fruitfulness of a bud is known to be no longer susceptible to temperature. Shoot growth potential may be promoted by increasing the number of needle primordia in the terminal bud during green- house production. About 3 weeks after the shoot apex had grown away from a node, the bud situated at that node consisted of an apical dome and approximately six leaf primordia. It was known that temperature had its greatest effect on subsequent fruitfulness of a bud at this stage. At the time a node was separating macroscopically below the shoot apex, its subtended bud consisted of an apical dome and two leaf primordia. Bud development outdoors was similar to that in growth cabinets under the best conditions. This parallels effects on initiation of bunch primordia. Bud development, in terms of leaf primordia, was depressed, with reduction in both light intensity and temperature. In contrast, a flower bud is generally used to describe the entire structure including the meristem and any associated. In the case of a flower this will be a small meristematic bump typically at the periphery of a shoot apical meristem. At intervals, up to 13 weeks after bud burst, shoots were harvested, and both the number and fresh weight of leaf primordia, in buds at certain nodes, were measured. A primordium (plural: primordia) is the first recognizable manifestation of a biological structure. Grapevines (Vitis vinifera L., cultivars Muscat Gordo Blanco and Sultana) were grown in controlled-environment growth cabinets.
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