ARLEY is a very suitable material for mutation studies. It is di-B ploid and autogarnous and its chromosome number is fairly low (2n= 14). After STADLER had shown that mutations could be experimlentally induced in plants, work was started at Svalof for utilizing this discovery in plant breeding. Much work has been done in this field at Svalof within various agricultural crops, barley being the species most intensely treated. At first only X-rays were used as a mutagenic agent. X-ray treatment of seed gave rise to a great number of mutations in barley. Among the viable, morphological mutations thus originated a certain type was more frequent than others, uiz. the so-called erectoides -~~ ~~~ 4 -I . a @% d _-.
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Hagberg et al. (2010) studied this question.