Abstract
A study was made of the restoration of fertility in cytoplasmic male sterile petunia. The fertility expression of plants with restorer genes in sterilizing cytoplasm proved quite dependent upon environmental conditions, especially temperature. In experiments with clones at a series of constant temperatures in the phytotron fertility appeared to follow an optimum curve, the position of the optimum and the width of the fertility range depending upon the number of restorer genes present. On the basis of the phytotron data a preliminary genetical analysis could be made for a part of the material. Restoration of fertility appeared to be governed by at least three factors: a major gene Rf 1, an accessory gene rf 2, and a gene or complex of genes referred to as Rf 3.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
