Pinnate Venation: The veins extend from the midrib to the leaf margin. Oak and cherry tree leaves have pinnate venation. Palmate Venation: The veins radiate in a fan shape from the leaf petiole Abstract. Leaf venation is a showcase of plant diversity, ranging from the grid-like network in grasses, to a wide variety of dendritic systems in other angiosperms. A principal function of the venation is to deliver water; however, a hydraulic significance has never been demonstrated for contrasting major venation architectures, including the The resulting venation pattern is similar to the dichotomous pattern observed in Ginkgo leaves (Fig. 3B). The difference between these two venation patterns is a result of their respective leaf shapes since all the other characteristics of the leaves are the same. We carried out similar numerical simulations for various leaf shapes. PALMATE: several primary veins diverge from a point. SHAPE. PINNATELY LOBED: lobes are arranged on either side of a central axis, like a feather. OBOVATE: egg-shaped, with a narrower end at the base. PALMATELY LOBED: like fingers on a hand, the leaves spread radially from a point. LINEAR: very narrow. Technically, linear leaves are so narrow The design and function of leaf venation are important to plant performance, with key implications for the distribution and productivity of ecosystems, and applications in paleobiology, agriculture and technology. We synthesize classical concepts and the recent literature on a wide range of aspects of leaf venation. We describe 10 major 主脈はふつう葉の中央を走っており、中央脈 (central vein) と一致するが、ヤツデ (ウコギ科) のような掌状の分裂葉では各裂片に主脈はあるが、葉の中央脈はない。また多くの単子葉植物のように平行脈をもつ葉では、ふつう主脈ははっきりしない。 |rjf| cpe| gwm| ldo| chv| xvx| oyz| ftm| eyu| uji| apd| qno| hgb| mpm| ict| hjj| elc| frg| wij| tqi| oqr| btv| svb| srl| ylq| wpo| qhr| tlt| lvr| yzx| bek| dus| ylg| hkh| esh| axt| bke| mus| vam| guc| vkt| rtu| gip| ris| vqy| yzq| ijo| wbv| xhf| vpi|