phototropism Charles & Francis Darwin experiment. Coleoptile: protective sheath of shoot in monocot.
de-etiolation Etiolation and de-etiolation.
transduction hydrophobic steroids (testosterone) and light can cross plasma membrane, enter the cell.
phytochrome_transduction de-etiolation: chlorophyll & photosynthesis proteins.
auxin_response Auxin: mainly indoleacetic acid, or IAA; high concentrations inhibit elongation by inducing ethylene
Vegetative propagation of plants by cuttings. Rooting powder containing auxin: adventitious roots from stem
2,4-D herbicide overdose kills eudicots
Grow seedless tomatoes by substituting synthetic auxin for auxin made by developing seeds.
apical_dominance Cytokinins are produced in growing tissues: roots, embryos, fruits.
retard aging by inhibiting protein breakdown: cytokinin sprays to keep cut flowers fresh.
ethylene CO₂ inhibits new ethylene, retard apple ripening.
gravitropism Statoliths in plastids.
parasitoid BBC-LifeInTheUndergrowth/1.2_TakingToTheAir/#18:40 Cabbage White damage attracts parasitoid 22:10 grubs
BBC-LifeInTheUndergrowth/2.1_IntimateRelations/#11:30 Parasitoid wasp oviposits into gall wasp larva; 44:10 Ichneumon wasp
===

SQ: 
AQ: 1=c  2=C?  3=A?
CQ: 1=C? 2=E?        35=E

0. Tropic: growth response that results in curvatures of whole plant organs
1. Blue-light photoreceptors: carotenoid–based zeaxanthin for stomatal opening
2. Retinal is visual chromophore - geometric isomers.