Biochemical responses of 5 buckwheat (Fagopirum esculentum Moench.) cultivars to seed treatment by Azospirillum brasilense
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Kuupäev
2020
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Abstrakt
Cultivation condition have a large effect on efficiency of buckwheat. Drought, high
temperatures and their fluctuations, salinity, oxygen deficit in the soil, ultraviolet radiation, and
abnormal nutrient content in the soil are the most common reasons of decreasing productivity of
plants. Suboptimal parameters of the cultivation technology can also cause abiotic stress. Plant
can decrease its efficiency from 30% to 50% depend on stress conditions. Using bacterial cultures
is one of the preventive approaches to overcoming the negative impact of stressors.
Microorganisms produce biologically active substances that stimulate plant growth, increase their
resistance to abiotic factors. They are growth regulators and long-acting anti-stressants as well.
Malondialdehyde (MDA) is formed as a result of the oxidative degradation of polyunsaturated
fatty acids. Fructans are polysaccharides that are derived from D-fructose residues found in higher
plants, green algae and bacteria. Fructans are involved in the adaptation of plants to the action of
abiotic stressors and are valuable nutrients. The effect of Azospirillum brasilense pre-sowing
treatment of buckwheat seeds on physiological and biochemical processes of MDA and fructan
content was researched. Seed treatment with Azospirillun brasilense reduced the content of MDA
in Ukrayinka and Syn 3/02. Sofia and Olga had a low level of MDA, but seed treatment increase
it. Seed treatment increased the efficiency of photosynthesis (Fv / Fm) in Syn 3/02 from 0.58 to
0.72; in other varieties this effect was negligible. All cultivars have a strong relation between
MDA and fructan content, that shows their participation in responses on cultivation conditions.
Efficiency of photosynthesis in flowering–seed formation stage (BBCH 65–75) was close to
maximum in field condition(0.70 ± 0.05) and seed treatment can increase it.
Kirjeldus
Märksõnad
buckwheat, malondialdehyde (MDA), fructans, fluorescence, articles