xylem

• PttGID1. 1 and PttGID1. 3 were overexpressed in independent lines of hybrid aspen, when both a 35S promoter and a xylem-specific promoter —  CiteULike: Everyone's library
• Instead, they are primarily composed of vascular bundles (xylem and phloem) arranged in a circle around a central core of spongy tissue made up of parenchyma cells, or pith.
• The state of knowledge concerning the influences of tree size, xylem dysfunction, growth conditions and within-species and between species genetics is reviewed. —  CiteULike: Everyone's library
• In nature, trees use water in tubular tissues, called xylem, like ropes that pull more water out of the ground, delivering it to leaves. —  The Open Piehole
• By building mimics of xylem capillaries within the gels, the scientists were able to create negative-pressures of the magnitude observed in trees, and to pump water against large resistances and out of subsaturated, or partially dry, sources. —  The Open Piehole

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