MICR 3220 Lecture Notes - Lecture 6: Hydathode, Acer Platanoides, Sporobolomyces
30 Dec 2015
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Document Summary
The nutrients that are present under the phyloplane: can come from a source within the leaf or outside the leaf. When microorganisms arrive on phyloplant they ahev some stored nutirnets but not much, must use plants. Endogenous: diffusates diffuse from centre of leave out to leafs surface. Small molecules like simple sugars, amino acids. Don"t diffuse rapidly: guttation fluid, related to hydathodes (modified stomates, most. Water content inside leaf is too high (typically morning, not often on edge of leaf) Modified stomates release little blebs of water which much evapo trans) contain nutrients. When more transpiration occurs water is sucked back in. Fluid may spread out a bit over hydathode, solution then dries on leaf surface things dissolved in it stay on leaf surface. Happens more often on leaf edge or tip: exudates secrete compounds onto leave surface that are inhibitory to microorganisms. Believed use to help in plants defense.
