• Aynullo Safaralikhonov Pamir Biological Institute of the Academy of sciences of the Republic of Tajikistan, Khorog
  • Ogonazar Aknazarov Pamir Biological Institute of the Academy of sciences of the Republic of Tajikistan, Khorog
Keywords: Triticum aеstivum L, Hordium vulgare L, Vicia faba L, Ceratoides papposa, auxins, growth inhibitors, highland, UV-radiation.


The hormonal response of cultivated and wild plants to high intensity of UV-radiation and other stress factors of the highlands was studied. The activity of auxins and growth inhibitors substances in wheat (Triticum aеstivum L), barley (Hordium vulgare L), horse bean (Vicia faba L), and eurotia (Ceratoides papposa) leaves, that grew in a field condition were analyzed at different stages of development, using thin-layer chromatography and bioassay. The leaves of cultivated plants (2320 and 2700 m above the sea level) and wild plants (2320 and 4000 m above the sea level) were collected at two elevations in Pamir highland (Tajikistan). The level of auxin activity at the beginning of ontogenesis in plant leaves that grew at both elevations was relatively higher in comparison with the activity of growth inhibitors. However, at the end of the vegetation period an increase in growth inhibitor activity was observed in plant leaves at both elevations. Increasing of the total auxin activity in plants was observed at low altitude compared to higher. Conversely, the activity of growth inhibitors substances increased in plants that grow at higher elevations.


Aknazarov., O. A. (1991). Effect of UV radiation on growth, morphogenesis and the level of hormones in alpine plants [The Impact of UV-radiation on growth, morphogenesis, and hormones level in highland plants]. Doctoral Dissertation, Dushanbe. 47.

Boyarkin, A. N. (1984). Methods of quantitative determination of the activity of growth substances [Methods of quantitative determination of growth substances activity], Moscow, Nauka.

Bongue-Bartelsman, M., Phillips, D. A. (1995). Nitrogen stress regulates gene expression of enzymes in the flavonoid biosynthetic pathway of tomato. Plant Physiology and Biochemistry. 33, 539-546.

Caldwell, M. M., Ballare, C. L., Bornman, J. F., Flint, S. D., Djorn, L. O., Teramura, A. H., Kulandaivelu, G., Tevini, M. (2003). Terrestrial ecosystems, increased solar ultraviolet radiation and interaction with other climate change factors. Photochemical and Photobiological Sciences. 2, 29-38.

Caldwell, M. M., Björn, L. O., Bornman, J. F., Flint, S. D., Kulandaivelu, G., Teramura, A. H., Tevini, M. (1998). Effects of increased solar ultraviolet radiation on terrestrial ecosystems. Journal of Photochemistry and Photobiology B, Biology. 46, 40-52.

Dehne, K. Z. (1989). Variation von Absolut-und Relativwerten der UV Globalstrahlung [For variation of absolute and relative values of Global UV-radiation] In: Laufener Seminarbeiuage (pp 13-26.). Akademie fur Naturschutt und Landschaftspflege [Academy of Natural debris and landscape maintenance] Laufenl / Salzach.

Diaz, M., De Haro, V., Munoz, R., Quiles, M. J. (2007). Chlororespiration is involved in the adaptation of Brassica plants to heat and high light intensity. Plant Cell Environment. 30, 1578-1585.

Feng, H., An, L., Chen, T., Qiang, W., Xu, S., Zhang, M., Wang, X. (2003). The effect of enhanced ultraviolet-B radiation on growth, photosynthesis and stable carbon isotope composition (δ13C) of two soybean cultivars (Glycine max) under field conditions. Environmental and Experimental Botany. 49, 1-8.

Fiscus, E. L., Booker, F. L. (1995). Is increased UV-B a threat to crop photosynthesis and productivity. Photosynthetic Research. 43, 81-92.

Hofmann, R. W., Campbell, B. D., Bloor, S. J., Swinny, E. E., Markham, K. R., Ryan, K. G., Fountain, D. W. (2003). Responses to UV-B radiation in Trifolium repens L. - physiological links to plant productivity and water availability. Plant Cell Environment. 26, 603-612.

Huyuan, F., Shiwen, L., Lingui, X., Lizhe, A., Xunling, W. (2007). The interactive effects of enhanced UV-B radiation and soil drought on spring wheat. South African Journal of Botany. 73, 429-434.

Jenkins, G. L. (2009). Signal transduction in response to UV-B radiation. Annual Review of Plant Biology. 60, 407-431.

Jansen, M. A., Den Noort, R. E., Tan, M. Y., Prinsen, E., Lagrimini, L. M., Thorneley, R. N. (2001). Phenol-oxidizing peroxidases contribute to the protection of plants from ultraviolet radiation stress. Plant Physiology. 126, 1012-1023.

Jansen, M. A. K. (2002). Ultraviolet-B radiation effects on plants: induction of morphogenic responses. Plant Physiology. 116, 423-429.

Kefeli, V. I. & Turetckaya, P. K., Vlasov, I. V., Kof, E. M. (1973). Method of determination of plant hormones, growth inhibitors, defoliants and girbitsidov [Methods of identification of phytohormones, growth inhibitors, defoliants, and herbicides]. Moscow, Nauka.

Kefeli, V. I., & Kof, E. M. & Vlasov, I. V. & Kislyn, E. N. (1989). Natural growth inhibitor abscisic acid [Natural growth inhibitor-abscisic acid]. Moscow, Nauka.

Kolb, C. A., Kaser, M. A., Kopeckyґ, J., Zotz, G., Riederer, M., Pfundel, E. E. (2001). Effects of natural intensities of visible and ultraviolet radiation on epidermal ultraviolet screening and photosynthesis in grape leaves. Plant Physiology. 127, 863-875.

Lavola, A., Julkunen-Tiitto, R., Roininen, H., Aphalo, P. (1998). Host-plant preference of an insect herbivore mediated by UV-B and CO2 in relation to plant secondary metabolites. Biochemical Systematics and Ecology. 26, 1-12.

Li, Y., Zu, Y. Q., Chen, H. Y., Chen, J. J., Yang, J. L., Hu, Z. D. (2000). Intraspecific responses in crop growth and yield of 20 wheat cultivars to enhanced ultraviolet-B radiation under field conditions. Field Crops Research. 67, 25-33.

Melchior, G. H. (1958) Uber Abben von Indolderivaten [Uber Abben of indole derivatives]. Planta, 557.

Millborrow, B. V., Robinson, D. R. (1973). Factors affecting the biosynthesis of abscisic acid. Journal of Experimental Botany. 80, 537-548.

McKenzie, R. L, Aucamp, P. J, Bais, A. F, Bjorn, L. O, Ilyasd, M. (2007). Changes in biologically active ultraviolet radiation reaching the Earth's surface. Photochemical and Photobiology Sciences. 6, 218-231.

Rozema, J., Van de Staaij, J., Bjorn, L. O., Caldwell, M. (1997). UV-B as an environmental factor in plant life: stress and regulation. Trends in Ecology and Evolution. 12, 22-28.

Ros, J., Tevini, M. (1995). UV-radiation and Indole-3-acetic acid: Interactions during growth of seedlings and hypocotyl segments of sunflower. Journal of Plant Physiology. 146, 295-305.

Shomansurov, S., Aknazarov, O. A. (2005). Экологические условия Памира и жизнедеятельность растений [Ecological condition of Pamir and plants vital activity]. Душанбе, Дониш.

Stratmann, J. (2003). Ultraviolet-B radiation co-opts defense-signaling pathways. Trends in Plant Science. 8, 526-533.

Tegelberg, R., Julkunen-Tiitto, R. (2001). Quantitative changes in secondary metabolites of dark-leaved willow (Salixmyrsinifolia) exposed to enhanced ultraviolet-B radiation. Plant Physiology, 113, 541-547.

Veteli, T. O., Tegelberg, R., Pusenius, J., Sipura, M., Julkunen-Tiitto, R., Aphalo, P. J., Tahvanainen, J. (2003). Interactions between willows and insect herbivores under enhanced ultraviolet-B radiation. Oecologia. 137, 312-320.

Wang, S. L., Duan, A. E., Eneji, Z. L. (2007). Variations in growth, photosynthesis and defense system among four weed species under increased UV-B radiation. Journal of Integrative Plant Biology. 49, 621-627.

Walling, L. L. (2000). The myriad plant responses to herbivores. Journal of Plant Growth Regulation. 19, 195-216.

Yang, H., Zhao, Z. G., Qiang, W. Y., An, L. Z., Xu, S. J., Wang, X. L. (2004). Effects of enhanced UV-B radiation on the hormonal contents of vegetative and reproductive tissues of two tomato cultivars and their relationships with reproductive characteristics. Plant Growth Regulation. 43, 251-258.

Yuan, L., Lilian, H., Yanqun, Z. (2010). Intraspecific variation in sensitivity to ultraviolet-B radiation in endogenous hormones and photosynthetic characteristics of 10 wheat cultivars grown under field conditions. South African Journal of Botany. 76, 493-498.

Zhang, Z., An, L., Feng, H., Chen, T., Chen, K., Liu, Y., Tang, H., Chang, J., Wang, X. (2003). The cascade mechanisms of nitric oxide as second messenger of ultraviolet-B in inhibiting mesocotyl elongations. Photochemistry and Photobiology. 77, 219-225.