Abstract
This work aimed to evaluate meiotic index in Myrtaceae species, native of southern Brazil. Flower buds were collected and stored in ethylic alcohol:propionic acid (2:1) until evaluation by the smear and squash technique with propionic carmin as a dye. minimum of 10 buds and 2000 tetrads were observed. Acca sellowiana showed a high cytological stability (96%) whereas Eugenia involucrata, E. pyriformis, Campomanesia xanthocarpa, and E. uniflora (populations A and B) showed reasonable stability, respectively 87.3%, 89.5%, 89.3%, 84.8%, and 88.3%. Pollen germination of E. uniflora was considerably low than of the other species. The most common abnormality was the occurrence of triads. Further evaluations should be conducted in individual plants of each species, in order to enable the characterization of different clones or populations to form the basis of future genetic breeding programs.
Highlights
The Brazilian fauna is rich in wild species that constitute a patrimony of inestimable value (Mielke et al 1990)
Among many other native species, the Myrtaceae family is outstanding in southern Brazil
Meiotic abnormalities may occur during the microsporogenesis
Summary
The Brazilian fauna is rich in wild species that constitute a patrimony of inestimable value (Mielke et al 1990). Among many other native species, the Myrtaceae family is outstanding in southern Brazil. EMBRAPA Temperate Climate Research Center, in Pelotas, RS, Brazil, maintains an active Germplasm Collection to conserve these species, study their potential, and establish a breeding program as well as to develop a production system for their commercial cultivation in the future. The ex situ conservation of these plants can bring about some problems such as the lack of adaptation to the conditions of the collection site. Love (1949) defined the term “meiotic index” as the percentage of normal tetrads at the end of meiosis division. This percentage is an index of the meiotic regularity, which increases with the increasing normality of the chromosomal behavior
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