II.46. Chromosomal chimaerism in barley.
T. Tsuchiya and R. J. Singh. Department of Agronomy, Colorado State University, Fort Collins, Colorado 80521, U.S.A.
Three types of chromosomal chimaerism are reported in this note.
1. Three plants which showed chromosomal chimaerism for diploid (2n = 14) and tetraploid (2n = 28) cells were obtained in the progenies of 14 + 1 ring chromosome plant. This chimaerism was observed in root tip cells, and also on the leaves which showed dark and light green stripes. Some tillers did not show this pattern. Meiosis has not been studied yet. It is difficult to predict the heritable nature of this chromosomal chimaerism at present.
2. A plant with a chromosomal chimaera was obtained in the telotrisomic for Chromosome 1L. Five out of 15 tillers were morphologically normal diploid with tall culms, large leaves, and spikes with complete seed fertility. Other tillers showed diagnostic characteristics for telotrisomic for chromosome 1L (Tsuchiya, 1971, 1972). It appears that all three diploid tillers came from one place and the tissues of that part may be diploid. This type of chimaerism in 14 + 1 telo 1L has already been reported by Tsuchiya (1972), who has discussed the origin of chromosomal chimaerism.
3. A primary trisomic plant for chromosome 1 (Bush) isolated in the progeny of telotrisomic plants for Telo 1S showed chromosomal chimaerism similar to the above-mentioned case of Telotrisomic for Telo 1L. Three out of more than ten tillers were much taller than the others and had large, completely fertile spikes.
References:
Tsuchiya, T. 1971. Barley Genetics II:72-81.
Tsuchiya, T. 1972. Seiken Ziho 23:47-62.
(Supported partly by NSF Research Grant GB30493 to T. Tsuchiya.)