Invasive Species Compendium

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Abstract

Karyotype variation in 4 species of Poa L.

Abstract

Eighteen species of Poa grow in Iran. Several introduced species of Poa are economically important. The species are commonly cultivated for lawns and pasture, and are a major forage species. In addition, they are widely planted for soil stablization and forage. Cytogenetic studies are very important for the aim of genetic improvement. Therefore, quantifying interspecies chromosome variation can provide important information for plant breeders. In order to study cytogenetic characteristics of Poa L., karyotypes of 4 species were analyzed using image analysis system. The basic chromosome number was x=7 for all of the studied species. But their ploidy levels varied indicating chromosome variation among the studied species. Variance analysis showed significant differences (P<1%) among the species for all of the recorded traits indicating chromosome measures variation in the studied germplasm. According to Levan method on chromosome type, all of the studied species had submetacentric chromosomes (Sm) that implies asymmetric karyotype for the species. Based on Pearson correlation method long arm length, short arm length and total chromosome length were inter-correlated (P<1%). CI had negative correlation with AR (P<1%) and number of chromosomes correlated with long arm length, short arm length and total chromosome length. LSD test showed significant differences (P<5%) on long arm length and total length in Poa strilis and Poa pratensis, for long arm, short arm and total length between Poa strilis and Poa angustifolia and for short arm length between Poa araratica and Poa angustifolia.