CORRELATION BETWEEN GROWTH OF CALLUS AND A NUMBER OF NODULE FOR PEA (PISUM SATIVUM)
Yu.P. Petrov
Institute of Cytology RAS, St.Petersburg;
e-mail: yupe3ov@mail.ru
The processes of nodulation and callusing were studied for pea Pisum sativum in a comparative aspect. Plants of seven sorts were used. The nodulation was characterized
by the number of nodules and their mass per one plant. A frequency ratio of nodules of various weight was described by the Lorentz equation. Growth of callus was described using
equation of the S-dependence. It is shown that plants can produce maximal (optimum for nitrogen fixation) mass of nodules by an increase either in the nodules number or in a mass
of each nodule. This feature is specific for a pea sort. This feature is specific for a pea sort. It was also found that the sorts whose plants have a large number of nodules produce the
calluses of maximum size. Small calluses are characteristic of the sorts having plants with a small amount of large nodules. The obtained data were interpreted on the assumption that
the nodulation is underlied by both differentiation and proliferation, whereas the callusing is due only to the proliferation process.
Key words: callus, nodule, correlation, differentiation, proliferation
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