| 单词 | root nodule |
| 释义 | > as lemmasroot nodule root nodule n. Botany a small swelling on the root of a plant; spec. one on the root of a legume or other higher plant containing symbiotic microorganisms which fix nitrogen. ΘΚΠ the world > plants > part of plant > root > [noun] > root nodule root tubercle1847 root nodule1877 1877 Jrnl. Hort., Cottage Gardener, & Country Gentleman 26 July 74 The root-nodules [of cucumber] are generally assumed to have a fungal origin. 1888 Bull. Agric. Exper. Station (Univ. Tennessee) 71 The beneficial work of soil microbes is not confined to that done in the root nodules and tubercles alone, but it is to a large extent general throughout the soil. 1949 A. Nelson Introd. Bot. xxv. 391 The root nodule, so typical of this bacterial association with a legume, commences when the bacterium enters the root hair of the legume. 2005 J. Diamond Collapse (2006) ix. 282 Its [sc. casuarina] root nodules that fix nitrogen, and its copious leaf-fall, add both nitrogen and carbon to the soil. < as lemmas |
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