| 释义 |
rhizobium|raɪˈzəʊbɪəm|
Also Rhizobium. Pl. -ia.
[mod.L. (coined in Ger. by B. Frank 1889, in Ber. d. deutsch. bot. Ges. VIII. 338), f. rhizo- + Gr. βίος life.]
A bacterium of the genus so called, which comprises heterotrophic aerobic individuals that form root nodules on leguminous plants and fix atmospheric nitrogen symbiotically with the plants.
1921R. E. Buchanan Agric. & Industr. Bacteriol. iii. 32 Rhizobium.—These organisms are minute rods, motile when young, by means of flagellata. 1947Endeavour VI. 130 When the seed of a legume develops in a soil containing Rhizobia the latter are attracted to the region of the developing root hairs. 1966McGraw–Hill Encycl. Sci. & Technol. XI. 546/2 The treatment of leguminous seeds with bulk preparations of effective rhizobia is widely practiced..for the purpose of..improving the yield and quality of leguminous plants. 1972A. H. Gibson in Leigh & Noble Plants for Sheep in Austral. xi. 103 Considerable attention has been given to the development of techniques for estimating numbers of rhizobia in the soil. 1973[see nodulate v. a].
Hence rhiˈzobial a., of or pertaining to rhizobia; rhiˈzobially adv.
1957Times 2 Dec. (Agric. Suppl.) p. vi/5 Both were inoculated with a peat-bound rhizobial culture and the fortuitous treading of the grazing animal was the only way in which the seeds could be covered. 1971Nature 16 July 175/1 The degree of rhizobial invasion after transfer of the cultured soybean root cells is related to the growth factor additions to the MS medium. 1977Whitaker's Almanack 1978 1030/1 Much of the recent work has been concentrated on showing that the selection of the right legume with the appropriate rhizobial species depends on the lectin existing in the legume. 1977J. L. Harper Population Biol. Plants xi. 365 Small amounts of 15N, a stable isotope, had been applied to the soil so that the nitrogen available to both species in the soil could be distinguished from the rhizobially fixed nitrogen which was unlabelled. |