Genetic relationship among cytoplasm analogs and morphogenic potential of maize inbreds --Nedev, T, Kruleva, M, Krapchev, B Three maize inbred lines, A654, B37, Wf9 and their analogs, possessing cytoplasm of S and C type (A654 S, A654 C; B37 S, B37 C; Wf9 S, Wf9 C) were used as experimental materials. We set up this survey to answer the question whether there is any relationship between different cytoplasm and morphogenic potential of maize inbreds. Maize inbreds used in this experiment have different potential for callus formation and plant regeneration (Nedev T et al. MNL 72:76). Data for media and procedures for cultivation are available in the same paper. A summary of the obtained results is given in the Table 1.

Table 1. The plant regeneration of maize inbreeds with cytoplasm analogies. Summary. (%).
A654 A654S A654C B37 B37S B37C Wf9 W9S Wf9C
33.1 41.4 18.5 - 1.3 2.5 4.8 6.6 1.5

As is shown in the table, the frequency of regeneration was the highest in A654 S. The reason for differences in regeneration potentials among inbreds is clear - different frequencies of genes controlling regeneration. The question about relations between A 654 (normal cytoplasm) and their male sterile analogs A654 S, A654 C in respect to their regeneration potential is more complicated. Maybe the explanation should be searched for in the connections between nucleus and cytoplasm at the physiological and genetic levels. A genetic aspect may be very attractive if one speculates about the relationship (or lack of relationship) between nucleus genes and genes located in cytoplasm - mitochondria, chloroplasts.

This work was supported by grant B-602 from the National Fund of Scientific Investigations of the Bulgarian Ministry of Education and Science.

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