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This paper comprehensively discusses the pathways of heavy metals into the plant root epidermis, the short-range transport pathway through the horizontal transport of coplanar and plasmodesmata, and the long-range transport pathway through the xylem and phloem for loading and unloading. The transport of heavy metal ions by the coplanar pathway is slow, while the transport of heavy metal ions by the extra plastid pathway has low resistance to migration and high rate. Cell wall adsorption and resolution are en-dogenous factors affecting the transport of heavy metal ions into the root xylem via the cytoplasmic ectodomain pathway, but the development of the Casparian strip and suberin in the root cortex, which constitute the ectodomain barrier, can block the ectodomain pathway of heavy metal ion migration to the xylem. Plant transpiration and root pressure provide the driving force for the long-distance transport of heavy metal ions in the xylem and are related to the transpiration rate of plants. The mechanism of plant detoxification and tolerance to heavy metals is mainly induced by the production of metallothionein, the formation of phytoch-elating pep tides (PCs) in stressed plants and the regionalization of heavy metals by vesicles. [ABSTRACT FROM AUTHOR]

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[ Objective] Healing is a typical response of potato tubers after wounding, which plays an important role in reducing postharvest diseases of tubers. However, it takes a long time for the tubers to completely heal. In order to seek measures to promote the healing, the effect of exogenous NO and ABA treatments on the accumulation of suberin in the wound-healing periderm of tubers was studied experimen tally, and the wound-healing mechanism of potato tubers after wounds was explored. [Method] In this study, potato tubers from 'W108' and ' D47' were used as materials. The materials were divided into two parts, peeled and unpeeled. Each potato was cut into 8 small pieces, using the cut surface as the wound surface. The artificially damaged tubers were treated with five treatment: Control ( ultra-pure water); Treatment 1 (1 mmol · 1 - 1 SNP); Treatment 2 (2 mmol · 1 - 1 SNP); Treatment3 (0.13 mmol · 1 - 1 cPTIO); Treatment4 (0.1 mmol · L- l ABA). The accumulation of suberin was observed at the wound site during wound-healing. [ Result] The accumulation of suber in gradually increased in wounded tubers during healing. SNP treatment and ABA treatment significantly promoted the accumulation of suberin in both varieties of potato ( P < 0. 05) than the control. Treatment 2 ( 2 mmol · L -1 SNP) had a better effect, which the accumulation of suberin was higher at 168 hours than in other treatments, while ABA had a better response at 72 hours. Then, there was a significant difference in the accumulation of suberin among different varieties, and the accumulation of suberin in ' W108 ' was significantly higher than that in ' D47' during wound-healing. In addition, the removal of native periderm had a certain effect on the accumulation of suberin in tubers. During wound-healing, the unpeeled tubers of ' D47' accumulated more suberin, while the peeled tubers of ' Wl 08 ' accumulated more suberin. [ Conclusion ] Exogenous NO and ABA treatments could significantly promote the accumulation of suberin after wound, that indicated exogenous NO and ABA treatments promotes wound healing of potato tubers. There were differences in the accumulation of suberin among different potato varieties and the native periderm. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)