Abstract
The influence of exogenic hormones (indole-3-acetic acid (IAA), abscisic acid (ABA) and kinetin) on defense reaction of wheat (Triticum aestivum L.) calli to the bunt agent Tilletia caries (D.C.) Tul. & C. Tul. was studied. ABA and kinetin induced the oxalate oxidase activity, increased the Н2О2 level, decreased germination of fungi teliospores and induced on calli the occurrence of dense sites non-infected by pathogen. On the contrary, IAA led to the decrease of oxalate oxidase activity, loosening of calli and increase germination of bunt agent teliospores and growth of fungi mycelium, besides stimulated rhizoids formation of wheat calli. Probably, the accumulation of Н2О2 in wheat calli under the influence of kinetin and ABA connected with activity of oxalate oxidase is one of the factors increasing defense reaction of wheat to bunt agent.
Highlights
Plant hormones are naturally occurring substances that at low concentration control various stages of plant growth and development and formation of defense reaction against different forms of stress factors [1] [2]
It is known that many pathogenic fungi are capable to synthesize and secrete hormone-like compounds into the plant tissues [1] [14], which certainly influence the formation of plant defense
Processes of organized growth of calli are adjusted by the parity of concentration of the basic groups of hormones―auxins, cytokinins and Abscisic Acid (ABA)
Summary
Plant hormones are naturally occurring substances that at low concentration control various stages of plant growth and development and formation of defense reaction against different forms of stress factors [1] [2]. The hormonal regulation of plant defense reaction for a long time has been of great interest for scientists. The data on effect of bunt agents on plants hormonal balance. The sharp and repeated activation of oxidoreductases which localized in plant cell wall and plasmalemma and regulate the level of reactive oxygen species (ROS) is important stage in the plant defense. ROS are considered as secondary messengers, starting the cascade of plants defense reactions, mediating the lignification of a plant cell wall [7] and besides showing biocide properties. ROS can suppress the growth of microorganisms by inducing hypersensitive destruction of host cells in the infection zone
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