Histology of fruitful rosette leaf on different fruiting wood categories in apple (Malus domestica Borkh)

Abstract

Palisade layer of cells in the leaves, as the basis of photosynthetic productivity was studied in leaves formed on fruitful rosette (developed bourse) on different fruiting wood categories in apple. The leaves of developed bourse are differentiated in mixed buds and develop in parallel with the development of inflorescences, which they are the first developed leaves on the tree, or leaves whose photosynthetic activity even during flowering operationalizes sustainability flowers. Cultivar specificities in organogenesis of different apple bearing branches lead to differences in the degree of differentiation of their mixed buds, expressed, among other things, in number and degree of differentiation of primordia leaves and flowers in mixed bud. The thickness of the layer of palisade and spongy tissue layer was determined by histological sections of apple leaves in three categories of fruiting wood (long shoots, one-year old spurs on two-year wood and one-year old spur on bourse-over-bourse fruited in that year-old fruting wood) in three apple cultivars with distinct differences in organogenesis of fruting wood pests and fruiting type (Idared, Mutsu and Čačak' late). The thickness of the palisade layer of leaf on fruitful rosette significantly depends on the category of fruting wood and cultivar.

Keywords

• palisade tissue
• spongy tissue
• young and old fruting wood