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Three aquatic angiospermic plants, namely, Hydrilla verticillata (L.f.) Royle. and two morphological forms of Egeria densa Planch. (dense leaf form and less dense leaf form), were studied cytogenetically and at the molecular level by using RAPD with five primer combinations. Hydrilla verticillata (2n=24) and Egeria densa (dense leaf form, 2n=16) showed distinct bimodal karyotypes. The smaller chromosome groups were metacentric in both the plants. The range of individual chromosome length for both bigger and smaller chromosomes groups was almost similar in these two plants. The total length of chromosome complement was about 1.5 times bigger in Hydrilla verticillata than in Egeria densa (dense leaf form). On the basis of RAPD finger-printing, these two plants were placed in the same cluster with very narrow genetic distance. This suggests that Hydrilla verticillata is actually an autotriploid of Egeria densa (dense leaf form). In contrast, the two forms of Egeria densa (dense leaf and less dense leaf form) were totally genomically different. Egeria densa (dense leaf form) was found to posses 2n=16 chromosomes, whereas 2n=24 chromosomes were found in Egeria densa (less dense leaf form). The “dense leaf form” has a distinct bimodal karyotype. In contrast, the “less dense leaf form” has a monomodal karyotype. The range of individual chromosome length of these two forms was also different. In Egeria densa (less dense leaf form), a pair of AT-rich secondary constriction bearing chromosomes was present, which was totally absent in the other form. Each specimen possessed distinct CMA-banding karyotypes. The RAPD fingerprinting placed these two forms in different clusters with a large genetic distance. The cytogenetical and RAPD data did not support placing the “dense leaf form” and “less dense leaf form” under the same species of Egeria densa. Therefore, a peer revisions for the taxonomic status of these three aquatic angiosperm is necessary.

cytologia

Karyotype and RAPD Analysis to Elucidate Taxonomic Status in Two Morphological Forms of &lt;i&gt;Egeria densa&lt;/i&gt; Planch. and &lt;i&gt;Hydrilla verticillata&lt;/i&gt; (L.f.) Royle.