Cytological studies of Brassicaceae Burn. (Cruciferae Juss.) from Western Himalayas

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• 作者：Syed Mudassir Jeelani (1)
  Savita Rani (1)
  Sanjeev Kumar (1)
  Santosh Kumari (1)
  Raghbir Chand Gupta (1)
  
• 刊名：Cytology and Genetics
• 出版年：2013
• 出版时间：January 2013
• 年：2013
• 卷：47
• 期：1
• 页码：20-28
• 全文大小：2604KB
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• 作者单位：Syed Mudassir Jeelani (1)
  Savita Rani (1)
  Sanjeev Kumar (1)
  Santosh Kumari (1)
  Raghbir Chand Gupta (1)
  
  1. Department of Botany, Punjabi University, Patiala, 147 002, India
  
• ISSN：1934-9440

文摘

Cytological studies have been carried out on 12 species of Brassicaceae Burn. on population basis from different geographical areas of Kashmir and Himachal Pradesh in the Western Himalayas. Variable chromosome reports for Barbaraea intermedia (n = 16), Cardamine loxostemonoides (n = 8), Nasturtium officinale (n = 8), Sisymbrium orientale (n = 14) on world-wide basis have been added to the previous reports of these species. The chromosome numbers in seven species as Barbaraea intermedia (n = 8), B. vulgaris (n = 8), Capsella bursa-pastoris (n = 8), Descuriania Sophia (n = 10), Rorippa islandica (n = 8), Sisymbrium strictum (n = 7) and Thlaspi alpestre (n = 7) have been worked out for the first time from India. The meiotic course in the populations of seven species such as Barbaraea intermedia, Capsella bursa-pastoris, Coronopus didymus, Descuriania sophia, Nasturtium officinale, Sisymbrium orientale and S. strictum varies from normal to abnormal while all the populations of two species Barbaraea vulgaris and Sisymbrium irio show abnormal meiotic course. Meiotic abnormalities are in the form of cytomixis, chromosomal stickiness, unoriented bivalents, inter-bivalent connections, formation of laggards and bridges, all resulting into abnormal microsporogenesis. Heterogenous sized fertile pollen grains and reduced reproductive potentialities have invariably been observed in all the meiotically abnormal populations. However, the meiotic course in all the populations of Cardamine loxostemonoides, Rorippa islandica and Thalspi alpestre is found to be normal with high pollen fertility.