Tatiana Kudelina, researcher, V.F. Kuprevich Institute of Experimental Botany, National Academy of Sciences of Belarus;
Olga Molchan, Head, Laboratory of water exchange and plant photosynthesis, V.F. Kuprevich Institute of Experimental Botany, National Academy of Sciences of Belarus, Candidate of Biological Sciences, associate professor.

Summary.
The authors give the research results of the light, with different spectral composition, effect on the morphogenesis of wild-type of Arabidopsis thaliana (Col 0), as well as wei8-1tar1-1 and ahk2 mutants with modified signal transduction processes of auxins and cytokinins. A specially developed technique was used that simplifies the assessment of the light effect on the growth and development of A. thaliana plants, especially the configuration of their root system during the entire growing season.
Key words: A. thaliana, LED illumination, spectral composition, photomorphosis, auxin, cytokinin.
References.
1. LEDs Make It Resilient: Effects on Plant Growth and Defense Review / M. Lazzarin [et al.] // Trends in Plant Science, 2020. https://doi.org/10.1016/j.tplants.2020.11.013.
2. Zakurin, A.O. Svetokul'tura rastenievodstva zashchishchennogo grunta: fotosintez, fotomorfogenez i perspektivy primeneniya svetodiodov / A.O. Zakurin, A.V. Shchennikova, A.M. Kamionskaya // Fiziologiya rasteniy. – 2020. – Vol. 67, N 3. – P. 246–258. In Russian
3. Blue light requirements for crop plants used in bioregenerative life support systems / N.C. Yorio [et al.] // Life Support & Biosph. Sci. –1998. – Vol. 5. – P. 119–128.
4. Blue light added with red LEDs enhance growth characteristics, pigments content, and antioxidant capacity in lettuce, spinach, kale, basil, and sweet pepper in a controlled environment / M.T. Naznin [et al.] // Plants (Basel). – 2019. – Vol. 8, N 4 // https://doi.org/10.3390/plants8040093.
5. Crop photosynthetic response to light quality and light intensity / I. Shafiq [et al.] // Journal of Integrative Agriculture. – 2021. – Vol. 20(1). – P. 4–23 // https://doi.org/10.1016/S2095-3119(20)63227-0.
6. Green light drives leaf photosynthesis more efficiently than red light in strong white light: revisiting the enigmatic question of why leaves are green / I. Terashima [et al.] // Plant Cell Physiol. – 2009. – Vol. 50. – P. 684–697.
7. Voytsekhovskaya, O.V. Fitokhromy i drugie (foto)retseptory informatsii u rasteniy / O.V. Voytsekhovskaya // Fiziologiya rasteniy. – 2019. – Vol. 66, N 3. – P. 163–177. In Russian
8. Integration of light and auxin signaling / K. J. Halliday [et al.] // Cold Spring Harb Perspect Biol. – 2009.
9. Kieber, J.J. Cytokinin signaling in plant development / J.J. Kieber, G.E. Schaller // Development. – 2018. – N 145(4).
10. Research Progress on the Roles of Cytokinin in Plant Response to Stress / Y. Liu [et al.] // International Journal of Molecular Sciences. – 2020. – N 21(18). – P. 6574.
11. TAA1-Mediated Auxin Biosynthesis Is Essential for Hormone Crosstalk and Plant Development / A. N. Stepanova [et al.] // Cell. – 2008. – Vol. 133, Iss. 1. – N 4. – P. 177–191. https://doi.org/10.1016/j.cell.2008.01.047.
12. The Arabidopsis Information Resource // https://www.arabidopsis.org/servlets/TairObject?accession=locus:2177261.
13. Primenenie gidrattsellyuloznoy plenki dlya issledovaniya rosta i razvitiya kornevoy sistemy model'nogo rasteniya Arabidopsis thaliana L / A.S. Krivobok [et al.] // Biotekhnologiya. – 2020. – N1. – P. 36–43. In Russian
14. Zavisimost' protsessov rosta i deleniya kletok v korne ot ego diametra / E.I. Bystrova [et al.] // Ontogenez. – 2018. – Vol. 49, N 2. – P. 91–100. In Russian
15. Osobennosti fotomorfogeneza Arabidopsis thaliana pri ispol'zovanii LED-osveshcheniya razlichnogo spektral'nogo sostava / T.N. Kudelina [et al.] // Ves. Nats. akad. navuk Belarusi. Ser. biyal. navuk. – 2021. – Vol. 66, N 1. – P. 42–52. https://doi.org/10.29235/1029-8940-2021-66-1-42-52. In Russian
16. Liu, X. Interplay between Light and Plant Hormones in the Control of Arabidopsis Seedling Chlorophyll Biosynthesis / X. Liu, Y. Li, S. Zhong // Front. Plant Sci. – 2017. – N 8. – P. 1433.
17. Regulation of photoperiodic flowering by Arabidopsis photoreceptors / T. Mockler [et al.] // Proc. Natl. Acad. Sci. USA. – 2003. – Vol. 100, N 4. – P. 2140–2145.