Phenotypic and genomic characterization of vine cactus collection (Cactaceae) |
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Authors: | N Tel-Zur Y Mizrahi A Cisneros J Mouyal B Schneider J J Doyle |
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Institution: | (1) French Associates Institute for Agriculture and Biotechnology of Drylands, J. Blaustein Institutes for Desert Research (BIDR), Ben-Gurion University of the Negev (BGU), Sede-Boqer, Israel;(2) Department of Life Sciences, Ben-Gurion University of the Negev (BGU), Beer-Sheva, Israel;(3) Department of Plant Biology, Cornell University, Ithaca, NY, USA |
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Abstract: | Hylocereus (Berger) Britton et Rose, Selenicereus (Berger) Britton et Rose and Epiphyllum Haw. species have commercial potential as exotic fruit crops in semi-arid and arid lands. The high genetic variability among
these species offers an opportunity for commercial cultivation. Toward this end we investigated genomic and morphological
characteristics including: nuclear DNA content (2C-values), stomatal length and density, potential yield and reproductive
parameters in 64 Hylocereus, Selenicereus and Epiphyllum accessions. Nuclear DNA content ranged from 3.21 pg for S. grandiflorus (L.) Britton et Rose spp. grandiflorus to 8.77 pg for H. megalanthus (Vaup.) Bauer. All species were diploid except the tetraploids H. megalanthus and S. vagans (Bgek.) Britton et Rose. Stomatal length and density, fruit weight, potential yields, number of viable seeds per fruit and
fruit maturation times were highly variable among accessions. No significant correlations were found between stomatal length,
density, and nuclear DNA content, nor between fruit weight and seed number. The high genetic variability found between the
accessions here provides further support for the excellent prospects of conserving and domesticating these exotic species. |
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