| 词汇 | cross-pollination |
| 释义 | cross-pollination noun[ U ] biology specializeduk /ˈkrɒsˌpɒl.əˈneɪ.ʃən/ us /ˈkrɑːsˌpɑːl.əˈneɪ.ʃən/ the process by which pollen (= powder produced by the male part of a flower) is carried from one flower to another by wind, insects, etc.异花受粉 Plant reproduction anther asexual reproduction asexuality asexually barrenness breeder chasmogamous endosperm germinate pistillate placentation pollinate pollination pollinator self-incompatible self-pollination sexlessly siltation sporangium stamen Chestnuts rarely set any nuts that produce mature seed from their own pollen but depend on cross-pollination. In the large seed gardens the varieties of flowers raised are either many or cross-pollination is carried on. Notice how the stigma and the anthers are kept as far as possible from each other to guard against self-pollination and to insure cross-pollination. The ablest patent lawyer in America might not know the difference between a bud and a graft, a layer or cross-pollination. They eat the pollen, which is supposed to taste as it smells and thus as they go from flower to flower they carry pollen from one blossom to another and so secure for the plant cross-pollination. cross-pollination | American Dictionarycross-pollination noun[ U ] us/ˈkrɔsˌpɑl·əˈneɪ·ʃən/ biology the process by which pollen (= powder produced by the male part of a flower) is carried from one flower to another by wind, insects, etc. Examples of cross-pollinationcross-pollination Although it was well-known that rice is mainly self-pollinating, it was also known that some cross-pollination can take place. The development of electronic means of sound recording, reproduction and transmission has allowed a cross-pollination of sonic environments to a degree never before imaginable. The significance of cross-pollination for various olive cultivars under irrigated intensive growing conditions. To prevent accidental legitimate cross-pollination, plants with pin-type flowers and plants with thrumtype flowers were grown in separate chambers. There is the potential for genetically modified organisms to contaminate crops through cross-pollination, making them unfit for sale through the organic market. Therefore, natural seed-set in the population probably occurs as a result of both cross-pollination and autogamy. Up to 20% out-crossing can occur due to cross-pollination by insects. Manual crosspollination using male-sterile plants to produce large quantities of hybrid seed is difficult and time-consuming because of the low success rate in cross-pollination. Thirdly, very few inflorescences flowered in synchrony, increasing the probability of cross-pollination. Seeds for rootstocks were produced by manual pollination with flower buds capped before anthesis and after manual pollination to prevent accidental cross-pollination. The bromeliad showed a flexible breeding system with autogamy occurring in addition to cross-pollination. Thus, they endeavour to promote cross-pollination of ideas from fields that may not otherwise have obvious overlap, and the idea works well. Insect-mediated cross-pollination results in fertilization followed by zygote formation in 50% of the ovaries. Yields and cross-pollination of soybean as affected by honey bees and alfalfa leafcutting bees. 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. See all examples of cross-pollination 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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