Аuthors: D. Y. SHARAVIN, graduate student,
N. P. KOVALEVSKAYA, candidate of biological sciences, junior researcher,
Institute of Ecology and Genetics of Microorganisms Ural Branch of the Russian Academy of Sciences (13 Golev Str., 614081, Perm; tel: +7 (902) 477-20-24; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Abstract: Soil salinization is one of the major issues in agricultural production. Enhancement of natural drought and salt resistance of crops due to microbial fertilizer presowing treatment is one of the most effective methods of crops protecting from drought and salinization. Study of phytosymbiotic interactions of aerobic methylotrophic bacteria and plants showed that the products of plant metabolism (methane, methanol, methylamines) are used for the growth of bacteria. Methylophaga sp. M1k and Para- coccus sp. M7 are methylotrophic bacteria isolated from plants of saline soils (Solikamsk city, Perm region), were able to syn- thesize phytohormone — auxin with the L-tryptophane in culture medium (reaching values of 10 and 70 µg/ml for M7 and M1k respectively). Experiments showed that seed treatment with halotolerant methylotrophic bacteria stimulates growth processes and synthesis of plant pigments. It was noted that at 0.5–1.0 % NaCl the weight of root increases of 2–3 fold Paracoccus sp. M7. Methylophaga sp. М1к and Paracoccus sp. M7 strain induced synthesis of chlorophylls, the total pigment content versus control samples increased up to 1.9 and 1.5 times respectively. Bacterial drug Paracoccus sp. M7 partly removes the nega- tive effects of increased salt concentration on seedling development in relation to the weight of root and shoots length, which is observed in the control embodiments. The development of the plant leaf, probably stimulated by bacterial synthesis of the phytohormone auxin synthesis whose cultures studied experimentally confirmed. Received data suggest the possibility of using these bacterial strains for creation of biofertilizer — plant growth promoter in the saline soils.
Keywords: spring wheat salt tolerance, morphometric parameters of seedlings, methylobacteria, phytohormones, pigments.
