II.28. The influence of barley stripe mosaic virus on the frequency of triploids and aneuploids in barley.
Jens Sandfaer. Agricultural Research Department, Danish Atomic Energy Commission, Research Establishment Risø, DK-4000 Roskilde, Denmark.
In a previous investigation it was found that the frequency of triploids in the two-rowed, diploid, spring barley varieties Tystofte Prentice and Svalöf Freja was 2.3 and 0.04 per cent, respectively (Hereditas 64:131-134, 1970) The material used from T. Prentice was found to have a high infection rate of barley stripe mosaic virus (BSMV), and in the material from S. Freja a low infection rate was found. The difference between the two varieties in frequency of triploids might be due to the difference in infection rate of BSMV.
To test the occurrence of triploids and aneuploids further, ten varieties were inoculated with BSMV and the frequency of triploids and aneuploids was determined in the progeny from these virus-infected plants as well as in the progeny from non-inoculated virus-free plants. The results of some of the varieties are given in Table 1.
In virus-free material, a few triploids were found in most of the varieties but the frequency was very low. However, our preliminary data indicate a significant variation between varieties. BSMV infected material had in all varieties a very considerable increase in the frequency of triploids and aneuploids. There was a significant variation in frequencies between varieties. The most frequent groups of aneuploids were 2n=2x + 1= 15 and 2n=3x + 1= 22.
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