protoxylem
英[prəʊtəʊ'zaɪləm]
美[ˌproʊtə'zaɪləm]
- n. [植]原生木质部
双语例句
- 1. It is found in protoxylem and first metaxylem tracheids and vessels.
- 可在原生木质部和初始后生木质部的管胞和导管中见到。
youdao
- 2. Protoxylem the PRIMARY xylem elements that are formed from the procambium first.
- 初生木质部的成分，最早由原形成层形成。
youdao
- 3. Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.
- 环状加厚：原生木质部导管和管胞的内层环状増厚。
youdao
- 4. The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
- 不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
youdao
- 5. The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
- 不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
youdao
- It is found in protoxylem and first metaxylem tracheids and vessels.
可在原生木质部和初始后生木质部的管胞和导管中见到。
用作名词 (n.)
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