| 单词 | phloem |
| 释义 | phloem noun[U] biologyspecializeduk/ˈfləʊ.em/us/ˈfloʊ.em/thetypeofplanttissuethattransportsfoodfrom theleavesto the otherpartsof theplant 韧皮部（这种类型的植物组织将食物从叶子运输到植物的其他部分）Compare xylem Biochemistry
phloem| American Dictionaryphloem noun[U] us/ˈfloʊ·em/biology thepartof aplantthatcarriesfoodfrom theleavesto otherpartswhere thefoodisneeded Examplesofphloemphloem Another explanation could be the lack in maize of specific signal sequences for the transport tophloemsap. From theCambridge English Corpus It feeds on thephloemin leaf sheaths, causing wilting and drying of the leaves. From theCambridge English Corpus Analysis of these sequences demonstrated high similarity among thephloem-restricted isolates and confirmed the existence of 2 main groups. From theCambridge English Corpus The term bark is used here to refer collectively to vascular cambium,phloem, cortex and periderm. From theCambridge English Corpus By contrast, the developmental changes inphloemsap composition were consistent between years, indicating a role for phloem sap quality in the aphid population crash. From theCambridge English Corpus This was attributed in part to a lowered concentration ofphloemamino acids and in part to difficulties in achievingphloemingestion. From theCambridge English Corpus Aphids and other pests are obligatoryphloemsap feeders, and they represent important prey for beneficial insects such as predators and parasitoids. From theCambridge English Corpus Another open question is whether the transgene product could be transported in thephloemsap. From theCambridge English Corpus To reach thephloemsieve elements the aphid's stylet mouthparts must pierce a series of plant tissues. From theCambridge English Corpus The enlarged cambial cells appeared to crush thephloemand were thus presumed to cause the hopperburn symptom characteristic of the leafhopper damage. From theCambridge English Corpus The sugar-richphloemis a possible niche for such organisms. From theCambridge English Corpus It is not known whether disproportionately higher levels of alkaloids in other tissues, principally thephloem, contribute to this aphid resistance. From theCambridge English Corpus This result contrasts with plant responses tophloem-feeding insects. From theCambridge English Corpus Since aphids are specialist herbivores targeting thephloemsieve element, it is reasonable to expect that changes in gene expression may be phloem-specific. From theCambridge English Corpus The specialist race found its host plant faster, reached thephloemsooner, and spent more time feeding than the generalist one. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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