详细释义
Noun:
-
central part of a plant ovule; contains the embryo sac
双语例句
- 1. The integument grew fast and overgrew the nucellus.
- 珠被生长较快，并逐渐包围珠心。
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- 2. The nucellus is usually degraded and absorbed as the endosperm develops.
- 珠心通常在胚乳发育时被分解和吸收。
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- 3. The female archesporium differentiates from the single cell under the epidermis of nucellus.
- 雌性孢原处于珠心表皮之下，为单细胞。
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- 4. There is no starch in the nucellus, integuments and the antipodal cells, the persistent synergid contains a large amount of starch.
- 珠心、珠被、反足细胞都不含淀粉。宿存助细胞具丰富的淀粉。
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- 5. There were only two layers of nucellus which had abundant cytoplasm and reserved substance, and were consumed at the stage of late heart-shaped embryo.
- 珠心细胞只有两层，细胞核大，胞质丰富，内含贮藏物质，至心形胚期逐渐解体。
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- 6. After years of observation and assessment on the top-grafting plants of nucellus seedlings, considerable quality variations were found among nucellus embryo plants.
- 对珠心苗高接植株多年观察及品质鉴定，认为珠心胚植株在品质上表现较大差异。
youdao
- 7. Upon further increase of the exogenous hormone concentration, new ovule primordia could be formed from the proliferated nucellus cells, which further developed into many new ovules.
- 进一步提高外源激素浓度，珠心细胞又可以分化出新的胚珠原基，进一步长大以后发育成许多新的胚珠。
youdao
- 8. About weeks after pollination, the tip cells of nucellus broke and secreted liquid into ovular canal, which promoted pollen movement to the nucellus and played important role for pollen germination.
- 传粉后约周，珠心顶端破裂，分泌物进入珠孔道，并与珠被分泌物共同作用于花粉，使花粉向珠心移动。
youdao
- 9. About 4 weeks after pollination, the tip cells of nucellus broke and secreted liquid into ovular canal, which promoted pollen movement to the nucellus and played important role for pollen germination.
- 传粉后约4周，珠心顶端破裂，分泌物进入珠孔道，并与珠被分泌物共同作用于花粉，使花粉向珠心移动。
youdao
- 10. About 4 weeks after pollination, the tip cells of nucellus broke and secreted liquid into ovular canal, which promoted pollen movement to the nucellus and played important role for pollen germination.
- 传粉后约4周，珠心顶端破裂，分泌物进入珠孔道，并与珠被分泌物共同作用于花粉，使花粉向珠心移动。
youdao
- The nucellus is usually degraded and absorbed as the endosperm develops.
珠心通常在胚乳发育时被分解和吸收。 - The region of an ovule that is opposite the micropyle,where the integuments and nucellus are joined.
合点珠孔对面的胚珠内结合珠被和珠心的一个区域。
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