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Meiotic chromosome number and behaviour of Onobrychis alborzensis (Fabaceae): a new species from northern Iran
Author(s) -
Ranjbar Massoud,
Hajmoradi Fatemeh,
Karamian Roya
Publication year - 2012
Publication title -
feddes repertorium
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.24
H-Index - 25
eISSN - 1522-239X
pISSN - 0014-8962
DOI - 10.1002/fedr.201100028
Subject(s) - bivalent (engine) , meiosis , biology , ploidy , anaphase , telophase , calyx , botany , genetics , pollen , chromosome , centromere , chromosome number , karyotype , gene , chemistry , organic chemistry , metal
The present study is focused on the cytogenetic and morphological criteria for distinguishing a new taxon belonging to Onobrychis sect. Hymenobrychis. The new species, O. alborzensis RANJBAR & HAJMORADI is described from Alborz Province and illustrated. It is closely related to O. talagonica RECH. F. and O. michauxii DC., but differs from them in a few morphological characters such as plant indumentum, stipule size and shape and size of the leaflets, standard and calyx. Meiotic chromosome number and behaviour were studied in O. alborzensis and O. talagonica . This report is the first cytogenetic analysis of these taxa. O. alborzensis is a diploid plant and possesses the chromosome number 2 n = 2 x = 14, inconsistent with the base number of O. talagonica witch shows 2 n = 2 x = 16. The general meiotic behaviour in both species was regular, with bivalent pairing and normal chromosome segregation at meiosis. However, some meiotic abnormalities were observed including varied degrees of sticky chromosomes with laggards, precocious division of centromeres in metaphase I, bridges in anaphase I, laggard chromosomes, micronucleus, asynchronous nucleus, cytomixis and tripolar cells in telophase II. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)