plants Article Short De-Etiolation Increases the Rooting of VC801 Avocado Rootstock Zvi Duman 1,2, Gal Hadas-Brandwein 1,2, Avi Eliyahu 1,2, Eduard Belausov 1, Mohamad Abu-Abied 1, Yelena Yeselson 1, Adi Faigenboim 1, Amnon Lichter 3, Vered Irihimovitch 1 and Einat Sadot 1,* 1 The Institute of Plant Sciences, The Volcani Center, ARO, 68 HaMaccabim Road, Rishon LeZion 7528809, Israel;
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[email protected] (V.I.) 2 The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel 3 The Institute of Post Harvest and Food Sciences, The Volcani Center, ARO, 68 HaMaccabim Road, Rishon LeZion 7528809, Israel;
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[email protected] Received: 5 August 2020; Accepted: 2 November 2020; Published: 3 November 2020 Abstract: Dark-grown (etiolated) branches of many recalcitrant plant species root better than their green counterparts. Here it was hypothesized that changes in cell-wall properties and hormones occurring during etiolation contribute to rooting efficiency. Measurements of chlorophyll, carbohydrate and auxin contents, as well as tissue compression, histological analysis and gene-expression profiles were determined in etiolated and de-etiolated branches of the avocado rootstock VC801. Differences in chlorophyll content and tissue rigidity, and changes in xyloglucan and pectin in cambium and parenchyma cells were found.