Abstract
The inheritance and manifestation of fasciation character in three fasciated lines of common pea Pisum sativum L. were investigated. All studied forms are characterized by abnormal enlargement of stem apical meristem leading to distortions in shoot structure. It was estimated that fasciation in mutant Shtambovyi is connected with recessive mutation in gene FAS, which was localized in linkage group III using morphological and molecular markers. It was demonstrated that fasciation in cultivar Rosacrone and line Lupinoid is caused by recessive mutation of the same gene (FA). The peculiar architecture of inflorescence in the Lupinoid line is a result of interaction of two recessive mutations (det fa). Investigation of interaction of mutations fa and fas revealed that genes FA and FAS control consequential stages of apical meristem specialization. Data on incomplete penetrance and varying expressivity were confirmed for the mutant allele fa studied.
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