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Comparative DNA Fingerprinting and Botanical Study of Certain Haworthia and Gasteria Species Growing in Egypt
Abstract
Introduction: Haworthia Duval and Gasteria Duval are succulent plants, native to South Africa. They have been used worldwide in folk medicine. They are members of the Alooideae subfamily, which has been always viewed as a taxonomically confusing sub-family. The present study aims to differentiate between Haworthia limifolia Marloth, Gasteria carinata (Mill.) Duval and Gasteria minima Poelln. growing in Egypt. Methods: A comparative botanical and genetic investigation is presented. Macromorphological and micromorphological botanical features of the leaves and stems of the species under investigation using the entire specimens, transverse sections and isolated elements. Moreover, their DNA was extracted from the leaf samples and RAPD-PCR analysis was made using 10 primers. Results: The comparative botanical criteria of the examined leaves and stems were identified. Furthermore, the total number of amplified products produced by the ten primers was 98 fragments. Primers OPB-07, OPB-01 and OPB-02, recording high percentage of polymorphism (78.6, 70.6 and 57.1%, respectively), can be used to differentiate between the examined species. While primers OPB-01, OPB-04, OPB-07 and OPB-08, generating fragments with wide molecular size (17, 14, 14 and 11fragments, respectively), can be used for the identification of Haworthia limifolia, Gasteria carinata and Gasteria minima. Conclusion: The macromorphological, micromorphological and genetic identifying parameters presented in the current study revealed good crieteria to authenticate and differentiate between Haworthia limifolia Marloth, Gasteria carinata (Mill.) Duval and Gasteria minima Poelln. © 2019 Phcog.Net. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.
... Haworthia, which is a succulent plant having transparent leaves, is widely grown and valued commercially as ornamentals [1,2]. In the past few decades, researchers have focused on tissue culture [3], new phenolics separation [4], propagation methods [5], DNA fingerprinting, and the botanical study [6] of plants from Haworthia species. Genomic information about this species is not yet available. ...
Haworthia cooperi var. pilifera is a succulent plant with ornamental value. The white–green leaf mutant (wl) showed a significant difference in leaf color from the wild-type plant (WT). In this study, we integrated the transcriptomes of wl and WT plants to screen differentially expressed genes related to leaf color variation. The results of transcriptome analysis showed that 84,163 unigenes were obtained after de novo assembly and the NR database annotated the largest number of unigenes, which accounted for 57.13%, followed by NT (43.02%), GO (39.84%), Swiss-Prot (39.25%), KEGG (36.06%), and COG (24.88%). Our finding showed that 2586 genes were differentially expressed in the two samples, including 1996 down-regulated genes and 590 up-regulated genes. GO analysis predicted that these differentially expressed genes (DEGs) participate in 12 cellular components, 20 biological processes, and 13 molecular function terms and KEGG analysis showed that metabolic pathways, plant–pathogen interaction, glycerophospholipid metabolism, endocytosis, plant hormone signal transduction, and ether lipid metabolism were enriched among all identified pathways. Through functional enrichment analysis of DEGs, we found that they were involved in chloroplast division and the biosynthesis of plant pigments, including chlorophyll, carotenoids, anthocyanin, and transcription factor families, which might be related to the formation mechanism of leaf color. Taken together, these results present insights into the difference in gene expression characteristics in leaves between WT and wl mutants and provide a new insight for breeding colorful leaf phenotypes in succulent plants.
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