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INVESTIGATION ON THE MEIOSIS OF DIPLOID
(M. ALBA
L.) AND 22-PLOID
(M. NIGRA
L.) MULBERRY SPECIES AND THEIR HYBRID RELATIVE TO THE PROBLEM OF THE
ORIGIN OF SPECIES
M. NIGRA
L.
Yu. M.
Agaev and
H.E.
Fedorova
Abstract: In an attempt to trace out the origin of 22-ploid M. nigra,
investigations on cytological behaviour of diploid M. alba, 22-ploid M. nigra and their hybrid revealed the occurrence of fairly regular meiosis
in all the cases. In spite of a large chromosome number, the presence of
bivalents and absence of multivalents in the 22-ploid M. nigra suggests
that it has probably originated by an increase in ploidy of diploid M.
alba. In addition to the similarities in cytological behaviour, lack of
apomixis and the tendency of M. nigra to propagate through seeds by
artii.cial means also support the above conclusion.
The Laboratory of Cytology and
Embryology.
The Institute of Genetics and Selection of the Academy of Sciences of
the Azerbaijan SSR, Baku, USSR.
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