Crearea restauratorilor ai fertilităţii polenului pentru formele paterne ale hibrizilor de porumb

Research with a set of 24 inbred lines was aimed at assessing 3 variants to development pollen fertility restorers analogues. In the first variant, donors with the Rf4Rf5Rf6 restoration genes were crossed as the maternal component with recipient line - retaining of C type androsterility. Subsequently, the F1 generation was pollinated with the recipient line in 3 consecutive generations, procreation offspring of generations BC1, BC2 and BC3. In the second variant, as a maternal component, we used an sterile line related to the recipient, as pollinator, the Rf analogue of the recipient line which had very poor pollen fertility. As a result, we obtained the F1 progeny, which in three consecutive generations was pollinated with the original version of the recipient, thus obtaining descendants BC1, BC2 and BC3. In the last version, as the maternal component was used the sterile analog of the recipient line, and as a pollinator an analogue Rf related to the recipient line was used. For type C sterility, we can recommend the use of the first two variants to development Rf analogues, when dominant Rf alleles or steril analogue genes are used as maternal component, and as a father - the genotype that needs to be transformed and not recommended the three creation model, because with the increase of the backcross level, it is very easy to lose the restoration of the pollen fertility in the analog. For fertility restorer analogues development in the M type cytoplasm, the first two variants are more effective: a) when donor the dominant gene allele of the Rf3 is a mother and the line to be transformed as a father, and b) when in mother quality is an steril line rfrf genus, and father - line semifixer rfRf. In the case where the sterile analog of the line is in the maternal position, and the dominant allele gene - father, the fertility rate decreases in the F1 generation and increases in the subsequent stages of backcrosses.