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首页> 外文期刊>Weed Biology and Management >Cellular and ultrastructural changes in the seedling roots of upland rice (Oryza sativa) under the stress of two allelochemicals from Ageratina adenophora
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Cellular and ultrastructural changes in the seedling roots of upland rice (Oryza sativa) under the stress of two allelochemicals from Ageratina adenophora

机译：两种紫茎泽兰化感物质胁迫下旱稻幼苗根中的细胞和超微结构变化

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摘要

Two sesquiterpene-derivative compounds, 4,7-dimethyl-1-(propan-2-ylidene)-1,4,4a, 8a-tetrahydronaphthalene-2,6(1H, 7H)-dione (DTD) and 6-hydroxy-5-isopropyl-3,8-dimethyl-4a,5,6,7,8,8a-hexahydronaphthalen-2(1H)-one (HHO), are the major putative allelochemicals of the aqueous leachates of Ageratina adenophora. A laboratory experiment was conducted, using the hydroponic method, to evaluate the cellular and ultrastructural changes in the seedling roots of upland rice under the stress of DTD and HHO. The subsequent changes were observed in the treated upland rice roots in comparison with their controls. The scanning electron microscopy results showed that the DTD-treated root tip cells turned into an irregular arrangement and shape and that most of them were wizened, with a poor cytoplasm. In the HHO treatment, the root tips had many irregularly shaped cells, with a greater number of sloughing cells, as well as short, wide cells that resulted in spherical and wider, but shorter, roots. At the ultrastructural level, DTD and HHO induced irregularly shaped and lobed nuclei, increased cytoplasmic vacuolation, reduced ribosome density and dictyosomes, and a reduced number of mitochondria in the cells, which indicated limited protein transportation and a reduced capability to export substances for cell development and growth in the upland rice seedling roots. The overall effect of HHO on the upland rice seedlings was more pronounced than that of DTD.
机译：两种倍半萜烯衍生物化合物4,7-二甲基-1-（丙烷-2-亚烷基）-1,4,4a，8a-四氢萘-2,6（1H，7H）-二酮（DTD）和6-羟基- 5-异丙基-3,8-二甲基-4a，5,6,7,8,8a-六氢萘-2（1H）-one（HHO）是紫茎泽兰含水浸出液的主要假定化感化学物质。采用水培方法进行了室内试验，以评价在DTD和HHO胁迫下​​旱稻幼苗根系中细胞和超微结构的变化。与对照相比，在处理过的旱稻根部观察到随后的变化。扫描电子显微镜结果显示，经DTD处理的根尖细胞变成不规则的排列和形状，并且大部分被干，细胞质较差。在HHO处理中，根尖具有许多不规则形状的细胞，具有大量的脱落细胞，以及短而宽的细胞，从而形成球形和较宽但短的根。在超微结构水平上，DTD和HHO诱导了不规则形状和浅裂的核，增加了细胞质空泡，降低了核糖体密度和单核小体，并减少了细胞中的线粒体数量，这表明蛋白质运输受到限制，出口物质用于细胞发育的能力降低。和生长在旱稻苗根上。与DTD相比，HHO对陆地稻幼苗的总体影响更为明显。

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