Auxin induced phototropin and gravitropism

Auxin induce phototroplem. 2 Agas block placed on decapitated Expt coleoptile upper block loweragablock IN 1 upperagar less Agarblock after limet block in more horizontal fowerblock coleoptile bending bending inmore inters Conclusion more las oxin in more auxinin auxin in lower side absorbed upper block lower block hyagar block Role of root cap for geauity perception root cap- - sense geavity expt Elx (A) removal of bay root cap Remove -Roof root - Root calp cap elongation bend towards vertical sidewith root remaining halfcap (B) loss of gravitropam horizontal root

stateaust Gravihopian in Roof modalER Rootcap helps for gravity perception by stacytes in columell organate - Statolyth (amyloplast) locates over specialize ER Nodical ER. Horbontally Placed root Statclyth reorganizeinto the bottom side ca2+ channel in nodal ER. open mechano gated PIN protein vesicle fused to the bottom side, more auxin flow to bottom side auxin growth in root more growth in upper side , root bend downward

Gravitropism in shoot Gravity sensing cell Starch sheath organelle- amyloplast Horizontally placed shoot anyloplast reorganke @ bottom side pin protein @ bottom auxid Promote shootgrowth more growth in bottom & shoot bend Upwaid Phototropism Blue ligh phot NPH3 * PIN vesicle more asxin receptor jose todark a Darksid side ( O E) less assin moregrowth a lightside Dark light bend towards moregrowth light in Daik side more Plant bend PIN@dark towardslight side