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18 sty 2024 · 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.
17 gru 2016 · We call the leaves that are connected to the stem through a simple petiole petiolates. In some cases, leaves are attached to the stem without a petiole, so we call them sessile . Petioles themselves can also have differences.
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 .
While collenchyma has soft cell walls, with viscoelastic properties that permit greater petiole bending without breakage, sclerenchyma has lignified and more rigid cell walls, which support and prevent mechanical damage to the adjacent, softer tissues.
In entomology, petiole is the technical term for the narrow waist of some hymenopteran insects, especially ants, bees, and wasps in the suborder Apocrita. The petiole can consist of either one or two segments, a characteristic that separates major subfamilies of ants.
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. (The term subsessile is sometimes used for a leaf/leaflet with a small, rudimentary petiole/petiolule.)
5 dni temu · Results showed allometric scaling between anatomical structure of xylem and phloem with leaf area. We also found correlations between photosynthesis rate, stomatal conductance, and anatomical traits in the petiole. The main novelty is how oaks present a different strategy depending on the leaf habit.
