
%0 Journal Article
%A Balatero, CH 
%A Darvey, NL 
%T Embryo Rescue Culture Medium for Improved Synthesis of 4x Wheat &#215; Rye Hybrids
%J Australian Journal of Botany
%D 1994/08/01
%V 42
%N 4
%P 493-500
%K 
%R https://doi.org/10.1071/BT9940493
%U https://www.publish.csiro.au/paper/BT9940493 
%X The cross-incompatibility barrier between 4x wheat and rye has limited the genetic base for triticale breeding. Experiments designed to improve the synthesis of wheat-rye amphihaploids were conducted. The effects of 2,4-D on crossability and 3x hybrid embryo differentiation, and the influence of one-step and two-step media on the culture of immature 3x embryos in vitro, were investigated. Application of 10 mg L-1 2,4-D slightly improved seed set but significantly reduced the frequency of normal embryos. In contrast to the reported favourable effect of 2,4-D on haploid embryo formation in wheat &#215; maize crosses, the application of 2,4-D in the present study offers no real advantage on amphihaploid embryo formation from 4x wheat &#215; rye crosses. For small and immature wheat-rye hybrid (3x) embryos, optimum recovery in vitro was obtained via a two-step procedure consisting of a semi-solid MN medium followed by MS medium supplemented with IAA (1 mg L-1) and BAP (1 mg L-1). For bigger and well-differentiated embryos, the use of a one-step Gamborg's B5 medium was sufficient. 
