Plant Nutrition - Structure and Function of Plants - Lecture Notes, Study notes of Biology

Download Plant Nutrition - Structure and Function of Plants - Lecture Notes and more Study notes Biology in PDF only on Docsity! Plant Nutrition 1. Problems with plant Nutrition were originally discovered by plants that looked “diseased” a. In reality these growth problems have nothing to do with viral, bacterial, or other parasitic types of disease – rather with a lack of necessary nutrients. 2. Macronutrients vs. Micronutrients (we are focusing on macronutrients) 3. Abbreviated Nitrogen Cycle 4. Biotic Nitrogen Fixation a. N2 (atmospheric) is converted to NH4+ b. Discovered as early as 300BC by the Greeks who knew to grow legumes to enrich soils. c. Mostly accomplished by bacteria that produce and enzyme called nitrogenase. d. Plant bacterial symbioses are critical in efficiently producing accessible nitrogen. e. Requires lots of ATP (respiration)! f. Must carefully regulate O2 g. Leghemoglobin is heme protein produced partially by the plant and part by the bacterium.  “protects” nitrogenase from free oxygen but also allow for sufficient respiration to occur so that ATP can be produced for the rhizobium. 5. Rhizobium, Bradyrhizobium, Nodules, and Legumes 6. Assimilation of Nitrogen a. Conversion of inorganic nitrogen (e.g., NH4+, N03-) to organic nitrogen. Docsity.com