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木质部汁液蛋白。

Xylem sap proteins.

机构信息

U.S. Department of Agriculture, Agricultural Research Service, Appalachian Fruit Research Station, 45 Wiltshire Road, Kearneysville, West Virginia, 25430.

出版信息

Plant Physiol. 1991 Jun;96(2):597-601. doi: 10.1104/pp.96.2.597.

DOI:10.1104/pp.96.2.597
PMID:16668227
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1080812/
Abstract

Xylem sap from apple (Malus domestica Borkh), peach (Prunus persica Batsch), and pear (Pyrus communis L.) twigs was collected by means of pressure extrusion. This sap contained a number of acidic peroxidases and other proteins. Two other sources of xylem sap used in this study were stem exudates and guttation fluid. Similar peroxidases were also found in stem exudates and guttation fluids of strawberry (Fragaria x ananassa Duch.), tomato (Lycopersicum esculentum L.), and cucumber (Cucumis sativus L.). Isoelectric focusing activity gels showed that two peroxidases (isoelectric point [pl] 9 and pl 4.6) were present in initial stem exudates collected in the first 30 minutes after excision. Subsequent samples of stem exudate collected contained only the pl 4.6 isozyme. The pl 4.6 peroxidase isozyme was also found in root tissue and guttation fluid. These observations suggest that roots produce and secrete the pl 4.6 peroxidase into xylem sap. Cucumber seedlings were treated with 100 microliters per liter ethylene for 16 hours and the exudate from decapitated hypocotyl stumps was collected over a 3 hour period. Ethylene increased the peroxidase activity of stem exudates and inhibited the amount of exudate released. These observations suggest that xylem sap peroxidase may play a role in plugging damaged vascular tissue.

摘要

苹果（Malus domestica Borkh）、桃（Prunus persica Batsch）和梨（Pyrus communis L.）嫩枝的木质部汁液通过加压挤压收集。这种汁液含有许多酸性过氧化物酶和其他蛋白质。本研究中使用的另外两种木质部汁液来源是茎渗出物和溢泌液。在草莓（Fragaria x ananassa Duch.）、番茄（Lycopersicum esculentum L.）和黄瓜（Cucumis sativus L.）的茎渗出物和溢泌液中也发现了类似的过氧化物酶。等电聚焦活性凝胶显示，在切除后 30 分钟内收集的初始茎渗出物中存在两种过氧化物酶（等电点 [pl]9 和 pl4.6）。随后收集的茎渗出物样本仅含有 pl4.6同工酶。pl4.6 过氧化物酶同工酶也存在于根组织和溢泌液中。这些观察结果表明，根产生并将 pl4.6 过氧化物酶分泌到木质部汁液中。用 100 微升/升乙烯处理黄瓜幼苗 16 小时，并在 3 小时内收集去顶下胚轴残端的渗出物。乙烯增加了茎渗出物的过氧化物酶活性，并抑制了渗出物的释放量。这些观察结果表明，木质部汁液过氧化物酶可能在堵塞受损的血管组织中发挥作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/efd6a0ba8c93/plntphys00693-0259-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/675d8fcadf31/plntphys00693-0257-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/1915f8053bac/plntphys00693-0257-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/6fba0e2cacab/plntphys00693-0258-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/36b7b768b2ea/plntphys00693-0259-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/efd6a0ba8c93/plntphys00693-0259-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/675d8fcadf31/plntphys00693-0257-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/1915f8053bac/plntphys00693-0257-b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/6fba0e2cacab/plntphys00693-0258-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/36b7b768b2ea/plntphys00693-0259-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d947/1080812/efd6a0ba8c93/plntphys00693-0259-b.jpg

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2
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