In CGMS, A-line is:
In CGMS three-line scheme A-line designated as cytoplasmic male sterile female parent carrying sterile cytoplasm S derived from wild abortive source and non-restorer genotype rfrf in nuclear background, so phenotype fully male sterile with whitish anthers containing aborted pollen but female fertility normal. Because cytoplasm maternally inherited, progeny from any cross where A-line used as female inherits S cytoplasm and remains sterile unless restorer allele introduced from male parent. To multiply A-line, cross made with maintainer B-line sharing identical nuclear genome but normal fertile
Ref: Singh BD CGMS A-line definition; Rice Knowledge Portal Three line system; Acquaah Hybrid breeding A-line.
