doi: 10.15389/agrobiology.2014.1.17eng
UDC 633.1:581.14:57.043:51-76
MODELS OF PLANT LINEAR GROWTH IN CONDITIONS OF OXIDATION STRESS INDUCED BY UV-B RADIATION
I.M. Mikhailenko, E.V. Kanash, V.N. Timoshin
Agrophysical Research Institute, Russian Academy of Agricultural Sciences,
14, Grazhdansky prosp., Saint Petersburg, 195220 Russia,
e-mail: IMikhailenko@agrophys.ru, ykanash@yandex.ru, office@agrophys.ru
Received July 8, 2010
Decrease in the rate of growth under the impact of many unfavourable environmental factors, UV-B (280-320 nm) radiation in particular, is a defensive mechanism of plants that minimizes the negative action of the damage done and may be related to diminished number of mitoses. This mechanism is evidently at work also in case of UV-B radiation adaptation of crop plants with intercalary growth of a leaf whose meristem zone is protected by the axil. We compared growth dynamics of the first leaf of barley (Hordeum vulgare L., cultivars Fukumugi and Belogorski) and wheat (Triticum aestivum L., cultivar Leningradka). Plants were grown in phytotron as well as in field conditions with modelling enhanced UV-B radiation; parameters in various growth models under stress at early stages of ontogenesis were estimated experimentally. The results obtained allowed to substantiate the method of mathematical modelling in diurnal time scale of plant linear growth in conditions of oxidation stress caused by UV-B radiation. With the use of the models devised, the error of measuring linear growth slowdown was ±5-6 mm. The best results were obtained with dynamic models whose accuracy was 20-25 % higher than that of the static model. The models proposed make it possible to evaluate the slowdown of linear and/or mass-volume growth depending on the intensity and the dose of stressful radiation. The accuracy of identification and prediction suggest that the method elaborated may be used also for modelling plant linear growth under the impact of other abiotic factors causing oxidation stress as well as of their combinations.
Keywords: UV-B radiation, plant height, growth dynamics, the model of linear growth, the parameters of the model, prediction.
REFERENCES
1. Sisson W.B. Photosynthesis, growth, and ultraviolet irradiation absorbance of Cucurbita pepo L. leaves exposed to ultraviolet-B radiation (280-315 nm). Plant Physiol., 1981, 67: 120-124. CrossRef
2. Jagger J. Growth delay and photoprotection induced by near-ultraviolet light. In: Research progress in organic, biological and medical chemistry. V. Gallo, L. Santamaria (eds.). NY, American Elsevier, 1972: 383.
3. De Moraes F.M., Tyrrell R.M. Mutational interactions between near-UV radiation and DNA damaging agents in E. coli: the role of near-UV induced modifications in growth and macromolecular synthesis. Photochem. Photobiol., 1983, 38: 57-63. CrossRef
4. Tevini M., Iwanzik W., Thoma U. Some effects of enhanced UV-B irradiation on the growth and composition of plants. Planta, 1981, 153: 388-394. CrossRef
5. Caldwell M.M. Plant response to solar ultraviolet radiation. In: Encyclopedia of plant physiology, physiological plant ecology 1. Responses to the physical environment. O.L. Lange, P.S. Nobel, C.B. Osmond, H. Ziegler (eds.). Berlin, Springer-Verlag, 1981, v. 12A: 169-198.
6. Ermakov E.I., Kanash E.V. Sel’skokhozyaistvennaya Biologiya [Agricultural Biology], 2005, 1: 3-16.
7. Ermakov E.I., Savin V.N., Kanash E.V. Sel’skokhozyaistvennaya Biologiya [Agricultural Biology], 2001, 3: 18-26.
8. Mikhailenko I.M. Sel’skokhozyaistvennaya Biologiya [Agricultural Biology], 2007, 1: 103-111.
9. Ivakhnenko A.G., Myuller I.A. Samoorganizatsiya prognoziruyushchikh modelei [Self-organization of predictive models]. Kiev, 1985.
10. Seidzh E.P., Melsa Dzh. Identifikatsiya sistem upravleniya [Identification of controlling systems]. Moscow, 1974.
11. Sovremennye metody identifikatsii sistem /Pod redaktsiei P. Eikkhoffa [Modern methods for system identificztion. P. Eikkhoff (ed.)]. Moscow, 1983.
