| 词汇 | raceme |
| 释义 | raceme noun[ C ] biology specializeduk /ˈræs.iːm//ˈreɪ.siːm/ us /reɪˈsiːm/ a group of flowers on a plant that are attached to a central stem by short stalks(= thin stems) of equal length: 总状花序 It is a low-growing plant with racemes of white, sweet-scented flowers.它是一种低矮的植物，开着白色的总状花序，散发着甜美的香味。 The wisteria is known for the beauty of its flowers, which appear in long, cascading racemes. The tree lupin is a woody evergreen shrub with compound palmate leaves and short racemes of pale yellow, delicately perfumed flowers. Its racemes of lavender flowers are not unlike wisteria in their overall effect. The raceme, which appears about the sixth to the tenth month, will take sixty days more to ripen. Parts of plants axil bark bilobed blade bulb caning cascara sagrada corolla endodermis inflorescence knot pistil rosella seed coat seed pod sessile shaw sting taproot tubule Examples of racemeraceme The raceme explant experiment was repeated several times (data not shown). After 7 days the basal stems were resterilized and freshly cut, and the raceme explants were transferred to fresh medium. Five matched sets of raceme explants (10 racemes) were removed from each of four plants with pin-type flowers and four plants with thrum-type flowers. An in vitro method to culture matched sets of racemes from individual plants was used for precise comparisons between experimental treatments. The first species is an evergreen rosette plant with succulent leaves and regular flowers borne along a raceme. Of the seeds initiated, control plants aborted 3.9 + 0.9 seeds per raceme, compared to 5.0 + 1.1 seeds aborted per raceme after water-deficit stress. The raceme explant was immediately placed in water and transported to the laboratory. They are borne on panicled racemes, with c. 34 pods per raceme. Newly opened flowers were hand pollinated daily by legitimate cross-pollination using pollen from flowers on racemes cultured at the same temperature as the receiving flowers. Pods (25-70 mm long x 20-25 mm wide) are borne on panicled racemes, with c. 12 pods per raceme on the study trees. Newly opened flowers were pollinated, and flowers and seeds were counted three to four times each week on five tagged racemes of each plant. Seed set on racemes of remaining branches in planta was unchanged by removal of branches for raceme explants. Buckwheat racemes form new flowers continuously during several weeks in planta. In vitro culture of buckwheat racemes provides a method to reduce the very large number of observations required for in planta studies on seed set in buckwheat. Raceme explants were removed by cutting the stem about 2 mm above the node of the raceme attachment and near the base of the internode below the node of attachment. 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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