A Database for Triticeae and Avena
Onion leaf or fused leaf in barley was reported earlier by Tsuchiya
(1958, 1964, 1967) in primary trisomics for chromosome 1 (Bush),
chromosome 2 (Slender), and chromosome 5 (Pseudonormal). It was also found
in ditelotetrasomic for the short arm of chromosome 5 (Wang and Tsuchiya,
1988). The onion leaves usually showed up in the late plant growing
stage. The whole leaf blade was rolled (fused) to show the typical onion-
like leaf, which occurred more frequently in later tillers.
Observations were made on the plants of trisomics and
ditelotetrasomics of chromosome 5 and related materials. Onion leaves
were found in triplo 5, ditelo 5S, and monotelo 5S plants, but not in
diploid siblings and triplo 5L. Also, this trait was observed more
frequently in triplo 5 and ditelo 5S than in monotelo 5S. This result
indicated that gene(s) for onion leaf might be located on the short arm of
chromosome 5, and it is assumed that certain gene(s) in the long arm of
chromosome 5 may enhance the onion leaf expression. Further investigation
is needed to explore the genetic nature of this phenomenon.
Tsuchiya, T. 1958. Studies on trisomics in barley I. Origin and the characteristics of primary simple trisomics in Hordeum spontaneum C. Koch. Seiken Ziho 9:69-86. (Jap. Eng. resume).
Tsuchiya, T. 1964. Chromosome aberrations and their use in genetics and
breeding in barley - Trisomics and aneuploids. Proc. lst Internal.
Barley Genet. Symp. (Barley Genetic 1):116-150.
Tsuchiya, T. 1967. The establishment of a trisomic series in a two-rowed
cultivated variety of barley. Can. J. Genet. Cytol. 9:667-682.
Wang, S., and T. Tsuchiya. 1988. Ditelotetrasomics for the short arm of
chromosome 5 (ditelo 5S) in barley. BGN 18:21-23.