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02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
02:27Basic Plant Anatomy: Roots, Stems, and Leaves
The primary organs of vascular plants are roots, stems, and leaves, but these structures can be highly variable, adapted for the specific needs and environment of different plant species.
02:26Responses to Gravity and Touch
Gravitropism: Plant Responses to Gravity
03:02Primary and Secondary Growth in Roots and Shoots
Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
03:24Seedless Vascular Plants
Seedless Vascular Plants Were the First Tall Plants on Earth
02:36Meristems and Plant Growth
Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
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植物科学.植物科学. 振荡的根是振荡的根.
1Laboratoire de Reproduction et Développement des Plantes, INRA, CNRS, ENS-Lyon, 46 Allée d'Italie, 69364 Lyon, France. jan.traas@ens-lyon.fr
Science (New York, N.Y.)
|September 11, 2010
概括
No abstract available in PubMed .
