Studies on Restoration and Substitution of Nucleus (Genome) in Aegilotricum

II. The interrelationships between ovata cytoplasm and fertility restoring factors

抄録

1) From the findings that some individuals with ovata plasm and durum genomes, having one extra chromosome of ovata as univalent in addition to the 14 durum bivalents, showed normal pollen fertility, the interrelationships between cytoplasm and fertility restoring chromosomes are discussed (diagrams). It is suggested that the fertility restoring agent does act in the somatic cells, not in the microspores.
2) Restoration of durum genomes to durum cytoplasm from ovata cytoplasm was obtained through backcrosses of partially fertile plants as pollinators to normal durum as female. The offspring having 14_II at meiosis have shown normal pollen fertility.
3) When male-sterile durum were crossed with 10 Emmer wheats others than durum var. Reichenbachii, the offspring was completely male sterile, while when T. dicoccoides var. Kotschyanum was used as pollen parent all the offspring were pollen fertile showing 1_IV+12_II at MI.