BIOB 110CS 1st Edition Lecture 12 Endosymbiont Theory chloroplasts and mitochondria evolved from early prokaryotes Vacuole unique plant storage for water and defense compounds Allelopathy Allelochemicals inhibit growth of other plants in vicinity Activated charcoal can absorb and remove these compounds Plants can detect how close another plant is and will grow in the opposite direction However parasitic plants will grow towards a host because it is necessary for survival Parasitic Plants Some parasitic plants such as Striga Asiatic are so bad that the area will be quarantined and that years harvest will be burned Corn and sorghum roots excrete strigol into the soil which attracts this parasitic plants Striga seeds germinate when strigol is detected and form a haustorium feeding structure Dodder o Has no roots or chlophyll o Encircle green plant stems and use it as a haustorium to steal the water and nutrients from the plant host as well as exchange DNA Defense Strategies 1 Syntheize toxins and release vacuole contents at wound site 2 Create lignin to seal off wound 3 Realease systemin to induce systemic defense reaction These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 4 Ststemic Aquird Resistance SAR long distance induction of defensive genes in response to a localized attack Plants Insects Insect Predators Chemicals in an insects saliva can trigger the plant to emit volatiles into the air to attract the natural enemy of the insect that in ingesting the plant Some plants wounded sagebrush release volatiles that warn other species of some danger Plant herbivore interactions can be seen as biochemical warfare on an evolutionary time scale Mycorrhizae symbiotic fungi that infect plant roots and enhance water and nutrient uptake Have dense networks of hyphae extending throughout the soil o Endomycorrhizae penetrate root cells and form haustoria reproduce by single spores Ectomycorrhizae live on surface of living roots reproduce by fruiting bodies
View Full Document
Unlocking...