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Morphology of leaf
- 1. Morphology of Leaf V. D. Tripathi Assistant Professor College of Forestry, Dapoli
- 2. A dorsi-ventrally compressed, lateral appendage of stem produced at the nodesandisspecialized to perform photosynthesis CHARACTERISTICSOFLEAF: - Leaf isa thin,expanded,green structure. - The green colour of the leaf is due to the presence of chlorophyll pigment. - Itisexogenousin origin. - Itisborne on the stem atthenode. - An axillary bud is often present in the axilof each leaf. - Ithas limitedgrowth. - It does not possess apical bud or a regular growing point.
- 3. PARTSOF A TYPICALLEAF : LEAFBASEOR HYPOPODIUM: SHEATH STIPULES - The part of leaf attached to the stem or branch isknown as leafbase. - It may assume different shapes in different plants. - In some leguminous plants, the leaf base may become swollen which is called pulvinus. - In monocots, the leaf base expands into a sheath covering the stem partially or completely. - Leaves of some plants possess a pair of lateral outgrowths at the base, on either sides of axillary bud. These outgrowths are called stipules and such leaves are called stipulateleaves. - The leaves without stipules are called ex- stipulateleaves. Stipules are usuallygreen. - The main functions of stipules are to protect the bud and carryout photosynthesis.
- 4. - Petiole isthe part of leaf connecting the laminawith the branchor stem. - Leaves that possess petiole are called petiolate and leaves without petiole are called non-petiolate or sessileleaves. - Petiole is usually cylindrical, but may be hollow (Papaya), tubular or flattened. - Function of petiole is to raise the lamina to expose it to more light and air and to helpin conduction. PETIOLE OR MESOPODIUM
- 5. LEMINA OR EPIPODIUM - Thisisthe largest,most important, greenand flattened part of the leaf. - It plays a vital role in photosynthesis, gaseousexchange and transpiration. - The leaf is known as dorsiventral when its ventral surface is structurally different from dorsal surface, e.g. dicotyledonous leaves. - The leaves having both similar surfaces are called isobilateral. Such leaves are found inmonocot plants