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INFLUENCE OF MUTATION IN THE GENE Sym26 OF THE GARDEN PEA (Pisum sativum L.) ON THE ORGANIZATION OF TUBULIN CYTOSKELETON IN NODULES

is characterized by the formation of ineffective nodules with premature degradation of symbiotic structures (T. Serova et al., 2018). It was shown that in the mutant line, the formed patterns of cortical and endoplasmic microtubules did not differ from those of the initial line SGE. Cortical microtubules formed an irregular pattern in meristematic and infect- ed cells and regular pattern in uninfected and colonized cells. Endoplasmic microtubules surrounded the nucleus in interphase cells, formed spindles and preprophase bands during mitosis, and also sur- rounded infection threads. At the same time, in the senescence zone in degrading cells, complete depolymerization of the tubulin cytoskeleton occurred in both infected and uninfected cells. In the initial line, senescence was induced only in four-week-old nodules, and microtubule depolymerization was also observed in senescent cells. Thus, the complete depolymerization of microtubules in various types of nodule cells can be a cytological marker of its senescence.