| Addition of Aegilops umbellulata chromosomes
to seven alloplasmic lines of a common wheat, Chinese Spring
Masayo KURAUCHI, Mitsue KOBAYASHI and Koichiro TSUNEWAKI Laboratory of Genetics, Faculty of Agriculture, Kyoto University, Kyoto, Japan Among the cytoplasms of 23 Triticum and Aegilops species, eight plasma types were recognized by TSUNEWAKI et al. (1976). As pointed out earlier (TSUNEWAKI and ENDO 1973), individual plasmons (=cytoplasmic genomes) show specific interactions with different nuclei. Thus, it is necessary to use nuclei of variable genetic constitutions in order to reveal every genetic characteristics of the plasmon. Alien chromosome addition to alloplasmic wheats will be one of the possible approaches for it. In each species, its nuclear genome and plasmon are harmoniously interacting with each other resulting in its survival. In order to know the role of individual chromosomes in this nucleus cytoplasm interaction, addition of individual chromosomes of the cytoplasm donor to an alloplasmic line will provide a critical way of approach. The present work is a part of the program, that aims to investigate the above two, i.e., (1) further elucidation of plasmon characteristics, and (2) resolution of the nucleus cytoplasm interaction into the chromosome cytoplasm interactions, in Triticum and Aegilops. Materials and Methods Seven alloplasmic lines of Triticum aestivum cv. Chinese Spring (abbreviated as CS) having the cytoplasms of Aegilops caudata, Ae. umbellulata, Ae. squarrosa, Ae. speltoides, Ae. sharonensis, Ae. ovata, and T. timopheevi, which represent the C, Cu, D, S, S1, M0 and G type plasmas, respectively, were crossed twice to five disomic addition lines of CS with Ae. umbellulata chromosomes as the recurrent pollen parent, and the monosomic and disomic addition type plants were cytologically selected in the F1 and B1 generation, respectively. The disomic addition lines of CS used as the pollen parent were kindly provided by Dr. G. Kimber, University of Missouri, Columbia, Mo., USA, to whom we would like to express our greatest gratitude. In the present paper, Cu1 to Cu5 are used to designate the five umbellulata chromosomes, which correspond to chromosome A to E in the original KIMBER'S designation (KIMBER,1967). |
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