2022
DOI: 10.3390/plants11192475
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Qualitative and Quantitative Anatomical Analysis of the Constitutive Bark of Q. ilex x Q. suber Hybrids

Abstract: Hybridization and introgression between cork oak (Quercus suber) and holm oak (Q. ilex) have traditionally been reckoned as undesirable processes, since hybrid individuals lack the profitable bark characteristics of cork oak. Nevertheless, a systematic and quantitative description of the bark of these hybrids at the microscopic level, based on a significant number of individuals, is not available to date. In this work we provide such a qualitative and quantitative description, identifying the most relevant var… Show more

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Cited by 2 publications
(5 citation statements)
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“…Analysis of the chemical composition of the outer bark regarding holocellulose, suberin, lignin and extractives content yielded results consistent with anatomical observations and transcriptomes. Specifically, the increased suberin amount in cork-type bark compared to rhytidome-type bark is consistent with the suberin proportion for these two species reported previously [ 68 ] and also with the greater number of phellem cells reported here and previously [ 8 , 11 ]. In addition, the chemical composition of these outer barks also agrees with their transcriptomes, because lipid metabolism and suberin GOs are only found in cork-type bark.…”
Section: Discussionsupporting
confidence: 92%
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“…Analysis of the chemical composition of the outer bark regarding holocellulose, suberin, lignin and extractives content yielded results consistent with anatomical observations and transcriptomes. Specifically, the increased suberin amount in cork-type bark compared to rhytidome-type bark is consistent with the suberin proportion for these two species reported previously [ 68 ] and also with the greater number of phellem cells reported here and previously [ 8 , 11 ]. In addition, the chemical composition of these outer barks also agrees with their transcriptomes, because lipid metabolism and suberin GOs are only found in cork-type bark.…”
Section: Discussionsupporting
confidence: 92%
“…This is the case of bark development, where F1 hybrids, carrying a copy of Q. suber genes, fail to form a long-living or persistent periderm. Maybe more interesting is the general suberization of inactive phloem, suggesting an alteration of expression patterns in this tissue, prior to its final death [ 11 ]. Genes upregulated specifically in rhytidome-type hybrids (cluster 2) may underlie this feature (Fig.…”
Section: Discussionmentioning
confidence: 99%
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