| 词汇 | auxin |
| 释义 | auxin noun[ C ] biology specializeduk /ˈɔːk.sɪn/ us /ˈɑːk.sɪn/ a chemical substance that controls growth in plants茁长素（植物生长素） Plant pathology anthracnose antifungal apple scab ash dieback avirulent canker dry rot Dutch elm disease etiolated excrescence fungicidal fungicide leaf scorch leaf spot nodal organophosphate pesticide potato blight scald sterility auxin | American Dictionaryauxin noun[ C ] us/ˈɔk·sən/ biology a chemical substance that controls growth in plants Examples of auxinauxin Similar results were obtained using auxin or kinetin but only those of the latter were presented. Both induction and morphogenesis of cyst nematode feeding cells are mediated by auxin. The principal growth regulators include auxins, abscisic acid, ethylene, cytokinins and gibberellins. The auxins, cytokinins and their interaction are generally considered of great importance in regulating growth and organized development. The ineffectiveness of auxin as a germination stimulant indicates that there are different requirements. Other suggestions have been made to explain auxin accumulation during nematode infection, such as the release of auxins from auxin conjugates (inactive auxin forms). The conditions were less in favour of cellular divisions (decreased hexose, auxin and cytokinin concentrations). Auxin\\kinetin ratio was also found to be important in triggering the surface changes, especially at high concentrations. He proved the existence in plants of a transportable compound (baptized auxin and later shown to be indole-3-acetic acid) that was responsible for the regulation of elongation growth. These observations suggest that auxin signalling is essential in both syncytium and giant cell formation and implies a change in the local auxin balance upon nematode infection. However, its effect is much weaker than the effect of the basic auxin molecule indole-3-acetic acid. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It was first discovered that the plant hormone auxin likely regulates apical dominance in 1934. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When cultured with auxin but no cytokinin, they grow large but do not divide. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Cytokinins act in concert with auxin, another plant growth hormone. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. She conducted extensive research into interactions between ethylene and auxin (another key plant hormone) in controlling numerous aspects of plant development. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. 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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