Dataset Information

Dissection of the Mechanism for Compatible and Incompatible Graft Combinations of Citrus grandis (L.) Osbeck ('Hongmian Miyou').

ABSTRACT: 'Hongmian miyou' (Citrus grandis L. Osbeck) is mutated from 'Guanxi miyou', with a different spongy layer coloration. Trifoliate orange (Poncirus trifoliata) is widely used as rootstocks in 'Guanxi miyou' grafting, whereas 'Hongmian miyou' is incompatible with available trifoliate orange rootstocks. To explore the reasons for the etiolation of leaves of 'Hongmian miyou'/trifoliate orange, anatomical differences among different graft unions, gene expression profiles, and auxin levels of scion were investigated in this study. A histological assay indicated that there was no significant difference in anatomical structure between the compatible and incompatible combinations. A total of 1950 significant differentially-expressed genes (DEGs) were identified and analyzed. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis revealed that genes involved in carbohydrate metabolism, energy metabolism, amino acid metabolism, and plant hormone signal transduction were significantly enriched. Moreover, the expression of nine genes in the auxin pathway were upregulated and three were downregulated in compatible combinations compared with those in the incompatible group. Further experiments verified that indole-3-acetic acid (IAA) content increases in the compatible graft combination, which suggests that IAA might promote graft compatibility.

SUBMITTER: He W

PROVIDER: S-EPMC5855727 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Dissection of the Mechanism for Compatible and Incompatible Graft Combinations of Citrus grandis (L.) Osbeck ('Hongmian Miyou').

He Wen W Wang Yan Y Chen Qing Q Sun Bo B Tang Hao-Ru HR Pan Dong-Ming DM Wang Xiao-Rong XR

International journal of molecular sciences 20180208 2

'Hongmian miyou' (<i>Citrus grandis</i> L. Osbeck) is mutated from 'Guanxi miyou', with a different spongy layer coloration. Trifoliate orange (<i>Poncirus trifoliata</i>) is widely used as rootstocks in 'Guanxi miyou' grafting, whereas 'Hongmian miyou' is incompatible with available trifoliate orange rootstocks. To explore the reasons for the etiolation of leaves of 'Hongmian miyou'/trifoliate orange, anatomical differences among different graft unions, gene expression profiles, and auxin level ...[more]

PMID: 29419732

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Project description:BackgroundFlowering plays an important role in completing the reproductive cycle of plants and obtaining next generation of plants. In case of citrus, it may take more than a year to achieve progeny. Therefore, in order to fasten the breeding processes, the juvenility period needs to be reduced. The juvenility in plants is regulated by set of various flowering genes. The citrus fruit and leaves possess various medicinal properties and are subjected to intensive breeding programs to produce hybrids with improved quality traits. In order to break juvenility in Citrus, it is important to study the role of flowering genes. The present study involved identification of genes regulating flowering in Citrus sinensis L. Osbeck via homology based approach. The structural and functional characterization of these genes would help in targeting genome editing techniques to induce mutations in these genes for producing desirable results.ResultsA total of 43 genes were identified which were located on all the 9 chromosomes of citrus. The in-silico analysis was performed to determine the genetic structure, conserved motifs, cis-regulatory elements (CREs) and phylogenetic relationship of the genes. A total of 10 CREs responsible for flowering were detected in 33 genes and 8 conserved motifs were identified in all the genes. The protein structure, protein-protein interaction network and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis was performed to study the functioning of these genes which revealed the involvement of flowering proteins in circadian rhythm pathways. The gene ontology (GO) and gene function analysis was performed to functionally annotate the genes. The structure of the genes and proteins were also compared among other Citrus species to study the evolutionary relationship among them. The expression study revealed the expression of flowering genes in floral buds and ovaries. The qRT-PCR analysis revealed that the flowering genes were highly expressed in bud stage, fully grown flower and early stage of fruit development.ConclusionsThe findings suggested that the flowering genes were highly conserved in citrus species. The qRT-PCR analysis revealed the tissue specific expression of flowering genes (CsFT, CsCO, CsSOC, CsAP, CsSEP and CsLFY) which would help in easy detection and targeting of genes through various forward and reverse genetic approaches.

Dataset Information

Dissection of the Mechanism for Compatible and Incompatible Graft Combinations of Citrus grandis (L.) Osbeck ('Hongmian Miyou').

Publications

Dissection of the Mechanism for Compatible and Incompatible Graft Combinations of Citrus grandis (L.) Osbeck ('Hongmian Miyou').

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