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2012 | 54 | 1 |

Tytuł artykułu

Cytogenetic diversity of Elsholtzia ciliata Benth. (Lamiaceae) from Kashmir Himalaya

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EN

Abstrakty

EN
Our cytomorphological study of various populations of Elsholtzia ciliata (Lamiaceae) collected from high-altitude sites of Kashmir Himalaya revealed two euploid cytomorphotypes, diploid (n=8) and tetraploid (n=16), growing sympatrically but inhabiting two different habitats. This is the first report of tetraploid (4×) E. ciliata from the Indian subcontinent. We found the course of meiois to be normal in diploids, but tetraploid individuals showed chromosome and meiotic irregularities: cytomixis at early prophase I, stickiness at metaphase I, and chromosome bridges at anaphase I. In tetraploids, 23 of the 26 pollen mother cells observed at metaphase I showed 0–6 quadrivalents, suggesting that the tetraploid is a segmental allopolyploid. Microsporogenesis was also abnormal in tetraploids, showing the formation of triads. All these anomalies are conducive to lower reproductive potential (40.70%) in tetraploids than in diploids (90.50%). Significant morphological differences between the two cytotypes are presented.

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-

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Tom

54

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1

Opis fizyczny

p.76-83,fig.,ref.

Twórcy

autor
  • Department of Botany, Punjabi University, Patiala, Panjab, India
autor
autor

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