其它几种新的植物激素JASMONATES.ppt

Conclusions and future directions Strigolactones: Synthesized in response to low nutrients Enhance AM fungi symbiosis Repress shoot branching and adventitious root formation Stimulate primary root growth, root hair elongation, secondary growth, and leaf senescence Stimulate germination of parasitic plants AM fungi Root parasite Through genetic approaches, combined with improved agronomical practices, it seems very likely that the curse of witchweed will one day be a distant memory * Excellent resources about plant pathogens are available through the American Phytopathology Society education resources: /edcenter/intropp/Pages/default.aspx * * Eschscholtzia californica * * Root growth is inhibited on elevated levels of MeJA or COR, in wild-type plants but not coi1 mutants. * * In the figure to the right the units are microgram PI per gram of tissue. The “No MJ” control treatment was important to show that this responses is specific to MJ treatment, not a response to manipulations of the plant. In the original article they also show a control plant that was in the same growth chamber as the MJ-treated plant, which did not induce PI expression; this control showed that the MJ was not leaking out of the sealed chamber to directly stimulte the leaf labeled “J2”. * * Brassinolide is the most active compound by weight, but probably not synthesized in at least some monocots. Castasterone is abundant in some tissues and plants. Other less-active BRs are also produced. * * * * * * Scale bars in a and b are 1 cm. * * * * * A genetic screen was used to look for genes that partially reverted the bri1 mutant phenotype. In this case, an activation screen was used, so the identified protein is overexpressed. Overexpression of BAK1 partially reverts the bri1 mutant phenotype * * * * * * * * * * * In the top experiment, -Erysiphe on the left is without pathogen, +Erysiphe on the right is with pathogen. The experiment was done in triplicate and shows results from each independent