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The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves the leaf stalk may be long (as in the leaves of celery and rhubarb), or short (for example basil). When completely absent, the blade attaches directly to the stem and is said to be sessile.
7 lut 2022 · Petioles are important plant organs connecting stems with leaf blades and affecting light-harvesting ability of the leaf as well as transport of water, nutrients and biochemical signals.
Some leaves are attached to the plant stem by a stalklike petiole and are called petiolate leaves (Figure \(\PageIndex{2}\)). Although petioles are narrow and often resemble stems, they are considered part of the leaf. A petiolate leaf thus consists of the blade and the petiole.
Leaves with petiole are called petiolate while those without petiole, are called sessile. They may be short or long and cylindrical. Sometimes, it is flattened as in the case of lemon. Then it is described as winged-petiole. In some plants the petiole undergoes modification to form the tendrillar-petiole which help the plant to climb.
The nature of the joining of the leaf to the stem is termed leaf attachment (sometimes treated under “Base”; see General Morphology). In general, leaves may be petiolate, with a petiole, or sessile, without a petiole. Leaflets of a compound leaf are, correspondingly, either petiolulate or sessile.
17 gru 2016 · The petiole is the stalk that supports a leaf in a plant and attaches it to the stem. Many people often call it a stem, which is incorrect. A stem is the part of the plant that serves as the main source of support and produces nodes and roots, and that’s not what we observe in petioles.
24 sty 2020 · Geometry, allometry and biomechanics of fern leaf petioles: their significance for the evolution of functional and ecological diversity within the Pteridaceae.
