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rachis and petiole
Photo by M. L. Elliott. A pulvinus on a petiolule is called a pulvinulus. There is a reddish-brown stripe on the rachis that corresponds to the necrotic leaflets. For palms with pinnate leaves, there will be at least one leaf with leaflets, either all of them or only a portion, on only one side of the rachis that will be discolored, usually a shade of brown due to desiccation or death. [2]:157 The broomrape family Orobanchaceae is an example of a family in which the leaves are always sessile. In some other plant groups, such as the speedwell genus Veronica, petiol…
Figure 5. 4 and 5), with a corresponding internal discoloration observed in cross-section.
Internal discoloration due to a petiole (rachis) blight pathogen.
Figure 3. For Phoenix canariensis, Syagrus romanzoffiana and Washingtonia robusta, Fusarium wilt causes the same symptoms as petiole (rachis) blight. This Livistona chinensis leaf has a reddish-brown stripe on only one side of the petiole due to petiole blight. In some plants, the petioles are flattened and widened, to become phyllodes or phyllodia, or cladophylls and the true leaves may be reduced or absent. (botany) The main shaft of either a compound leaf, head of grain, or fern frond. In general, the pathogens are distributed worldwide, although individual species may have a limited geographic range.
Creative Commons Attribution/Share-Alike License; (botany) The stalk of a leaf, attaching the blade to the stem.
This gives a characteristic foliage arrangement to the plant. Subpetiolate leaves have an extremely short petiole, and may appear sessile. Photo by A. J. Downer. Palms are the only known plant hosts for Cocoicola californica and Serenomyces spp., whereas the other pathogen species have multiple plant family hosts. Photo by M. L. Elliott.
Cocoicola californica has only been found in association with Washingtonia spp.
[4]:584, In the grasses (Poaceae) the leaves are apetiolate, but the leaf blade may be narrowed at the junction with the leaf sheath to form a pseudopetiole, as in Pseudosasa japonica.[5]:391. Leaves lacking a petiole are called sessile or apetiolate. Pulvina are common in the bean family Fabaceae and the prayer plant family Marantaceae. Botanically it is categorized as a vegetable and culinarily used as a fruit.[6][7]. The term "petiole" refers to the portion of the leaf between the leaf base and the leaf blade.A palmate leaf palm has only a petiole.The term "rachis" refers to the extension of the petiole into the leaf blade that the leaflets are attached to in a pinnate leaf palm.The leaves of pinnate leaf palms have both a petiole and a rachis.. Under high humidity situations, the pathogens will erupt through the epidermal tissue to expose fungal fruiting structures. See Wiktionary Terms of Use for details.
3). Internal discoloration will be observed in cross-sections of the discolored petiole and rachis (Fig. In botany, the petiole (/ˈpiːtioʊl/) is the stalk that attaches the leaf blade to the stem, [1]:87[2]:171 and is able to twist the leaf to face the sun. [3] Outgrowths appearing on each side of the petiole in some species are called stipules. This Phoenix canariensis leaf has green leaflets on one side of the rachis and necrotic leaflets on the opposite side. Figure 2. Eventually, the leaflets on the other side of the rachis will turn brown also, and the entire leaf dies. Photo by M. L. Elliott. The petiole allows partially submerged hydrophytes to have leaves floating at different depths, the petiole being between the node and the stem. The petiole is a stalk that attaches a leaf to the plant stem. 1). Because there are a number of pathogens associated with this disease, all palms may be susceptible to at least one of the pathogens. Diplodia, Dothiorella, Fusicoccum, Macrophoma, Phoma and Phomopsis have also been associated with symptoms of this disease. Used especially to refer to the metasomal segment of Hymenoptera such as wasps. https://sielearning.tafensw.edu.au/floristry/References/Parts%20of%20a%20leaf.htm#:~:text=The%20blade%20is%20the%20broad,the%20green%20food%20making%20cells.&text=A%20petiole%20will%20also%20twist,are%20shaded%20by%20other%20leaves, International Code of Nomenclature for algae, fungi, and plants, International Code of Nomenclature for Cultivated Plants, International Association for Plant Taxonomy, https://en.wikipedia.org/w/index.php?title=Petiole_(botany)&oldid=963878069, Articles with unsourced statements from June 2020, Wikipedia articles incorporating a citation from Collier's Encyclopedia, Creative Commons Attribution-ShareAlike License, This page was last edited on 22 June 2020, at 09:31.
All of the pathogens belong to the Kingdom Fungi. The regular diminutive pediculus is also used for "foot stalk". [citation needed], The petiole is a stalk that attaches a leaf to the plant stem.
Figure 1. 6), or be very distinct, individual structures with spore masses emerging (Fig.
The "bumps" are spore structures (pycnidia) of Dothiorella. (ornithology) The central shaft of a feather. In petiolate leaves, the leaf stalk (petiole) may be long, as in the leaves of celery and rhubarb, short or completely absent, in which case the blade attaches directly to the stem and is said to be sessile. [1]:98 Each leaflet may be attached to the rachis by a short stalk called the petiolule.
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