Vliv orientovaného světelného záření na růst a vývoj rostlin – pokusy pro výuku fototropizmu v biologii rostlin

to be conducted at high schools. Theoretical introduction describes different types of plant tropisms, e.g. gravitropism,
heliotropism and phototropism, and different types of nastic movements not directionally oriented. Phototropism is a type
of plant growth reaction oriented towards or against the direction of the source of irradiation, called positive phototropism
or negative phototropism, respectively. The Experiment 1 is aimed at the effect of the different irradiation wavelength on
the growth of plant shoot of Lepidium sativum. It is demonstrated there that blue light and, thus, blue photoreceptors are
determining stem positive phototropic reaction. The use of LED light source to induce irradiation of a narrow wavelength
is recommended. The Experiment 2 then demonstrates negative phototropism of plant roots. An important part constitutes
the experience gained during the design, accomplishment and verification process for the presented experimentation. Both
experiments were designed in cost-effective way for application of scientific approaches and protocols at high schools.