Abstract

CUSTODIO, Adriana R.; SIMPSON, Charles E.  and  MONTENEGRO VALLS, José F.. Cruzabilidad entre Arachis gregoryi (Fabaceae) y especies silvestres de Arachis con distintos genomas. Bonplandia [online]. 2021, vol.30, n.1, pp.91-106. ISSN 0524-0476.  http://dx.doi.org/10.30972/bon.3014669.

Summary: Cross-compatibility studies inArachisL. have brought to light possible new sources of genes for introgression in cultivated peanuts. A total of 32 different crosses were made, using accession V14957 ofA. gregoryiC.E. Simpson, Krapov. & Valls as the female parent andArachisspecies containing seven distinct genomes as male parents. The 3167 pollinations resulted in 153 confirmed inter and intraspecific hybrids. Viability estimates of paternal pollen by staining (PVS) varied from 46.75 to 99.17%, while the pollen count of the hybrids varied from 0.3 to 43.6%, this highest PVS resulting from an intraspecific combination, which suggests appreciable variability in accessions ofA. gregoryi. Viability estimates of paternal pollen by germination (PVG) resulted in consistently lower values for all materials, ranging from 41.91% to 88.00%.Arachis gregoryiis important to expand the available diversity of species associated with the peanut B genome; it has a potential to be incorporated as a parent in crosses that aim to expand the genetic base of peanuts and may be useful for concentrating important genes in pre-breeding lines associated with the B genome.

Keywords : Hybrids; interspecific crosses; peanut; pollen viability; wild relatives.

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