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Plant Systematics and Evolution

, Volume 153, Issue 1–2, pp 119–132 | Cite as

Genome size in gymnosperms

  • D. Ohri
  • T. N. Khoshoo
Article

Abstract

The DNA 2C and per chromosome values of 57 species belonging to 22 genera of gymnosperms have been analysed. The overall range is 12-fold with a modal value of about 30.0 pg.Cycadales exhibit a 2-fold difference. AmongConiferales with a 4-fold variation, thePinaceae have higher mean DNA contents as well as a greater range and diversity than other families. Remarkable interspecific differences are found inCycas, Picea, Larix, Pinus, Callitris, Cupressus, andChamaecyparis. Despite this, there is a constancy of basikaryotypes within these genera.Gnetum shows a distinctly low DNA value.

Key words

Gymnosperms Nuclear DNA content evolution polyploidy woody habit 

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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • D. Ohri
    • 1
  • T. N. Khoshoo
    • 2
  1. 1.Cytogenetics LaboratoryNational Botanical Research InstituteLucknowIndia
  2. 2.Distinguished Scientist (CSIR) Tata Energy Research InstituteNew DelhiIndia

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