WOUND-INDUCED VASCULAR OCCLUSIONS IN VITIS VINIFERA (VITACEAE): TYLOSES IN SUMMER AND GELS IN WINTER
WOUND-INDUCED VASCULAR OCCLUSIONS IN VITIS VINIFERA (VITACEAE): TYLOSES IN SUMMER AND GELS IN WINTER
复制标题
DOI：
10.3732/ajb.0800061
复制
发表时间：
2008-12-01
影响因子：
3
通讯作者：
Matthews, Mark A.
中科院分区：
文献类型：
--
作者：
Sun, Qiang;Rost, Thomas L.;Matthews, Mark A.
木质部导管中的维管闭塞是一种常见的对环境胁迫的反应，植物物种被认为主要是酪糖形成或凝胶形成。这些应激反应一年四季都会发生，但有关全年以及生长和休眠组织中的伤口反应的信息很少。根据全年四季修剪的葡萄茎的类型(酪糖或凝胶)、时间进程和空间分布来评估创伤诱导的血管闭塞。泰洛石主要在夏季形成，凝胶主要在冬季形成。细胞组织学分析表明，创伤诱导凝胶富含果胶。无论受伤的季节如何，凝胶的形成和酪蛋白的形成都在伤口后7d和10 mm内完成。大多数血管受创伤影响，但夏秋季节发生血管闭塞的比例(80%以上)高于冬春季(约60%)。这项研究首次表明，单一物种主要能够产生酪泥或凝胶，创伤引起的咬合类型取决于受伤发生的季节。冬季条件限制了伤口对可逆凝胶形成的反应，这可能有助于在春季重新填充栓塞的血管。
Vascular occlusion in xylem conduits is a common response to environmental stresses, and plant species are recognized as primarily tylose-forming or gel-forming. These stresses occur throughout the year, but there is little information on the wound responses throughout the year and in growing and dormant tissues. Wound-induced vascular occlusions were evaluated by type (tylose or gel), temporal progress, and spatial distribution for grape stems pruned in four seasons through an entire year. Tyloses were formed predominantly in summer and gels in winter. Cytohistological analyses indicated that wound-induced gels were pectin-rich. Both gel formation and tylose development were complete within 7 d and 10 mm from the cut regardless of the season of the wounding. Most vessels were affected by wounding, but a higher fraction of vessels developed occlusions in summer and autumn (Over 80%) than in winter and spring (about 60%). The study is, the first to show a Single species is capable of producing primarily either tyloses or gels and that the type of wound-induced occlusion is dependent upon the season in which wounding occurs. Winter conditions limit the wound response to reversible gel formation that may contribute to refilling of embolized vessels in the Spring.