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Unformatted text preview: as well as transmembrane passage) and into the stele via the endodermis. From the stele, most minerals are moved along with water in xylem throughout the plant. Recall that mycorrhizae are very important in mineral absorption for many plants, and accumulate a higher mineral concentration for plants. Mycorrhizae "infection" is promoted by the secretion of strigolactones by roots that stimulate the growth of the fungal hyphae (cells)toward the root. Mycorrhizae significantly increase the area for absorption and actively absorb minerals that are naturally in low concentration in soil. Both ectomycorrhizae and endomycorrhizae are common. Recall, too, that nitrogen fixation by bacteria is also critical for nitrogen availability. (See later with mineral cycling and the Nitrogen cycle.)...
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- Fall '09