کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2179527 1095058 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structures and functions of adventitious roots in species of the genus Philodendron Schott (Araceae)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Structures and functions of adventitious roots in species of the genus Philodendron Schott (Araceae)
چکیده انگلیسی

We discuss here the anatomical variations of the arrangements and compositions of stele types observed in different roots types in four populations of the three species of Philodendron as probable adaptations to their habitats. Terrestrial individuals of P. corcovadense have cylindrical steles while rupicolous individuals have lobate steles with dispersed internal cortical parenchyma. The Philodendron species sampled showed polyarch structures. The crampon roots of P. oblongum and anchor roots of P. cordatum show medullated protosteles, with the former species having a reduced pith with sclerified parenchyma cells while the latter has a wide pith and parenchyma cells with only slightly thickened walls. The feeder roots of P. cordatum also show a medullated protostele—although a central vessel is present until approximately 60 cm from the apex that later disappears, forming a parenchymatous pith. We conclude that the different root types reflect adaptations of the subgenera Philodendron and Meconostigma to their different habits and habitats, such as in P. corcovadense, where the roots of rupicolous individuals have lobate steles while the roots of the terrestrial plants have cylindrical steles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 209, Issue 10, October 2014, Pages 547–555
نویسندگان
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