Two segregating cytoplasmic streaks, SCS1 and SCS2, are described. The streaks continuously segregate non-mutant, streak and all-mutant seedlings. An association is shown between the amount of streaks on a shoot and the segregation displayed by the progeny of the shoot. SCS1 and SCS2 show exclusively maternal inheritance. The chloroplasts of SCS1 are highly defective when examined under the TEM, and contain very little chlorophyll. The chloroplasts of SCS2 appear superficially normal, though with a decreased chlorophyll content. The interaction of two nuclear genes with SCS's was tested. The importance of reciprocal crosses in barley breeding is indicated.
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Hannu Ahokas (2009) studied this question.
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