BASIC GENETIC BEHAVIORS OF EU- AND ANEUPLOID FATUOID OATS

Abstract

Fatuoid aberrants may arise through whole or part deficiency of chromosome C₉ which carries genes for the grain characters of cultivated oats and for meiotic synapsis. They are classified into three types by their particular chromosome constitutions and genetic segregation ratios (%) as follows: Het. Fatuoid Segregation 2n Configuration Normal Het. Hom. fatuoid Type I 42 20"+C₉" 28:50:22 Type II 41 20"+C₉' 3:45:52 Type III 41+fr 20"+C₉C_9S 28:54:18
Nullisomic hom. fatuoids of type II are asynaptic, dwarf and completely sterile. The long-arm (C_9L) of chromosome C₉ carries genes for the the cultivated type grain characteristics and its short-arm (C_9S) bears a gene controlling synapsis.