Meiotic behavior of Adesmia DC. (Leguminosae-Faboideae) species native to Rio Grande do Sul, Brazil

Abstract

Meiotic behavior in Adesmia DC. is described for the first time. The study encompassed twelve populations of seven Adesmia DC. species native to Rio Grande do Sul, Brazil. Populations with 2n = 2x = 20 are A. securigerifolia 9615, A. riograndensis 9590 (subnudae), A. latifolia 1568, 1775, 15025, A. bicolor JB-UFSM, A. incana var. incana 9636, 10288, A. punctata var. hilariana 6885, 10812, and A. tristis 10757. A. incana var. incana 9637 is a tetraploid with 2n = 4x = 40. The material was stained with 1% acetic orcein. The meiotic behavior of the populations studied was considered normal. The meiotic index (MI) and the estimates of pollen grain viability were above 95%, except for A. latifolia 1568 (MI = 89%). The present data indicate that these plants are meiotically stable and potentially fertile, apparently with no problems for use in programs of selection, crossing and viable seed production.

Meiotic behaviour and pollen fertility in the seventeen Brazilian species of Adesmia DC. (Leguminosae)

“…The abnormalities at this stage included mostly dyads and triads. Pollen fertility was also high, over 90%, for most accessions ( Table 2 very high meiotic index and pollen fertility (Table 2), confirming a previous work by COELHO and BATTISTIN (1998). Tetraploid accessions have been reported in A. incana by other researchers (CAS1RONOVO 1945;HUNZIKER eta/.…”

“…1.5 to 2.5pm) meta and sub-metacentric chromosomes, with suggestions of inter-specific differences on the total chromosome complement length. Previous observations on meiotic behaviour of 12 accessions of seven species showed regular chromosome pairing and high meiotic indexes and pollen fertility (COELHO 1996;COELHO and BATTISTIN 1998 …”

“…For Brazilian species, chromosome numbers have been determined (MORAES-FERNANDES and BARRETO 1964;MIOTTO and FORNI-MARTINS 1995;COELHO 1996;COELHO and BATTISTIN 1998;TEDESCO et al 2000b). Observations on chromosome morphology for some species (COELHO 1996), showed that most have small (ca.…”

Meiotic index in Myrtaceae native fruits trees from southern Brazil

“…However, in contrast to the present work, the occurrence of dyads, polyads, and abnormal tetrads was relatively high. Triads, polyads, and abnormal tetrads were also observed in 12 populations of Adesmia, native of southern Brazil (Coelho and Battistin 1998).…”

The cytogenetics and evolution of forage legumes from Rio Grande do Sul: a review

“…(Miotto and Forni-Martins, 1995;Coelho, 1996;Coelho and Battistin, 1998 Populational studies in three species of Vigna Savi, that is, V. luteola (Jacq.) Benth, V. adenantha (G.F. Meyer) Maréchal, Mascherpa & Satainier and V. longifolia (Bentham) Verdcourt, showed that all species were diploid with 2n = 22, and with regular meiosis and high meiotic indexes (92-96%) and pollen fertility (92-98%) (Senff et al, 1992).…”