Spectral response of corn (Zea mays) in root geotropism

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The primary roots of corn (Zea mays. Wisconsin hybrid 64A×22R) show positive geotropism following exposure to light. This confirms the works of other investigators. The curvature response begins at about 1 hr following irradiation and reached a plateau at 5 hr. A study of wavelengths 350-760 nm, using energies of 2.24×10^<14> photon・cm^<-2> and exposure times 60 sec, shows that the most effective light is at 660 nm with lesser effectiveness at 460 and 560 nm. The responses at 660 and 460 nm are reversible by a far-red (730 nm) exposure, indicative of the possible participation of phytochrome. Analyses of fresh tips of corn roots with a dual-wavelength difference photometer show the phytochrome content in the root to be about 0.16A (ΔOD) per gram fresh wieght. The requirement of light for the geotropic growth response of corn roots might be an adaptive phenomenon. The occurrence of photomorphogenic activity in the green light should be of concern to those who use green as the "safe" light in "dark" experiments.
日本植物生理学会の論文