Cytological Study on Sterility in Salvinia auriculata Aublet with a Bearing on Its Reproductive Mechanism

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Abstract
Salvinia auriculata is pentaploid, with 2n = 45 in leaf tip squashes. Analysis of mega- and microsporocarps, respectively, shows 62% and 45% abortive sporangia in which meiosis fails to occur and the archesporium degenerates. In functional mega- and microsporangia meiosis is typical of pentaploids. Many spore mother cells show failure of cytokinesis at the end of the 1st and 2nd divisions. The results are monads which lack a well organized nucleus. These and other irregularities of meiosis disrupt normal spore formation. The presence of multivalents indicates some homology betweenparental genomes. This homology suggests an intraspecific origin of S. auriculata.

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