20.500.12556/DiRROS-20928 Differences in xylem and phloem structure in living stumps of Norway spruce (Picea abies (L.) Karst.) and silver fir (Abies alba Mill.) Living stumps reported in many tree species were the first, circumstantial evidence of root grafting. Although stump overgrowth has been extensively studied in various tree species, anatomical observations have mainly focused on the xylem part. Here, we investigated the xylem and phloem structure in living stumps of two conifer species: Norway spruce (Picea abies (L.) Karst.) and silver fir (Abies alba Mill.). The mechanism of wound closure was similar in the two species, however, there were differences in the structure of wound tissues in wood and bark. Immediately after the injury, a callus consisting of parenchymal cells was formed, followed by wound-wood with wide increments. In addition, the wood structure and morphology of tracheids were changed. Tracheids lost their typical elongated and tapering structure; instead, numerous crooked and forked tracheids were present. Traumatic resin canals were present in both species but were more abundant in P. abies, which also had normal resin canals. While the structure of the xylem growth rings eventually normalized in both species, the width of the annual xylem increments was diminished. In both species, the typical structure of annual phloem increment was lost in the non-collapsed phloem and sclereids were very abundant in the collapsed phloem. In A. alba, the collapsed phloem was rich in swollen parenchyma cells containing blue-stained contents, while in P. abies, numerous large traumatic resin canals were conspicuous. The study showed that similar patterns of vascular tissue restoration exist in A. alba and P. abies in response to tree felling. However, there are certain species-specific peculiarities in the wood and phloem anatomical response, which might affect long-term stump functioning and survival. wood physiology phloem xylem Norway spruce Picea abies silver fir Abies alba ksilem floem smreka jelka Picea abies Abies alba drevesni štori fiziologija lesa true false true Angleški jezik Slovenski jezik Neznano 2024-12-03 14:32:07 2024-12-03 14:32:08 2026-03-06 03:56:37 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Opis vira z dne 12. 11. 2024; str. 276-295 iss. 2 Vol. 46 2025 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 2024-01-01 630*81 2294-1932 10.1163/22941932-bja10171 214666755 https://brill.com/view/journals/iawa/aop/article-10.1163-22941932-bja10171/article-10.1163-22941932-bja10171.xml 1 024b823a-b17b-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29595 iawa-article-p276_7.pdf iawa-article-p276_7.pdf 1 F0380F4AE81B42BBC7742B3843BA0B42 2869b1cf56b245b64774beaaf4772e2b41ce8f1518d75764dbba630c0cf32723 fd98d1c0-1894-11f1-81cd-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=41284 Gozdarski inštitut Slovenije 0 0 0