| 词汇 | pollination |
| 释义 | pollination noun[ U ] uk /ˌpɒl.əˈneɪ.ʃən/ us /ˌpɑː.ləˈneɪ.ʃən/ the process in which pollen is taken from one plant or part of a plant to another so that new plant seeds can be produced: 授粉 Many species of tree depend on the wind for pollination.许多树种依靠风来授粉。 When flowering begins, uncover the plants to allow pollination.开花时，揭开遮盖物以便让植物授粉。 See pollinate Bees are vital for crop pollination. Hot, dry and windy weather can inhibit pollination. In California alone, 400,000 acres of almond orchards require 800,000 colonies of honeybees for pollination. Plant reproduction anther asexual reproduction asexuality asexually barrenness breeder chasmogamous endosperm germinate palynology pistillate placentation pollinate pollinator self-incompatible self-pollination sexlessly siltation sporangium stamen Examples of pollinationpollination The first external manifestation of developmental differences during seed maturation occurred about 20 d after pollination as siliques were beginning to ripen. The morphology of the capitula suggests they are not well adapted for pollination by other nocturnal vectors such as bats or moths. Since the nocturnal canopy is relatively unexplored, the phenomenon of pollination by nocturnal bees may be commoner than these limited observations suggest. We compared the efficiency of foraging habit of one of the major pollinators in effecting pollination. In this study, considerable interspecific overlap of flowering periods was found within each pollination guild. Unopened inflorescence buds were removed at this stage and the number of flowers which received assisted pollination recorded. The final treatment was unmanipulated female inflorescences exposed to both wind and insect pollination modes (open pollination). Seed production from experimental flowers was then contrasted with those naturally exposed to pollination and nectar removal. We marked such flowers and studied their pollination efficiency. However, observations and pollination experiments indicated a dual mode of beetle and wind pollination for this palm species. Remaining chapters review the -owering, pollination requirements and main pollinators of 36 selected bee-pollinated crops, from alfalfa to watermelon. This paper describes several aspects of the reproductive ecology of piassava, especially its breeding biology, pollination and phenology. This increase in flower temperature is related to pollination, as it is not produced randomly during floral development. 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. |
| 随便看 |
|
反思网英语在线翻译词典收录了377474条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。