查询词典 metaxylem

It is usually found in metaxylem tracheids and vessels .

经常在木质部管胞和导管中发现。

Basipetal differentiation is seen in the formation of proto-and metaxylem in the stem.

在茎原生木质部和次生木质部的形成过程中可以看到这种类型的分化。

It consists of the protoxylem and metaxylem.

包括原生木质部和后生木质部。

The period length of lignin deposition was:fiber＜stone cell＜metaxylem vessel＜ground tissue parenchyma cell.The iignin content of each kind of cell wall increased constantly accompanying with the thickness increasing of cell wall.

结合场发射和透射电镜的研究结果表明，无论初生壁还是次生壁发育阶段，CMTs排列方式的变化与CMfs沉积方向的变化具有明显的一致性。5。

Ochikarawere studied in morphology. The results indicates that the Oochikara has lateral root primordium and lateral root, and RM109 has no those. The number of pericycle cells in protoxylem of RM109 reduces to the 77% of that of Oochikara ; the number of vessel in metaxylem increases, and the number of vessel Ⅰ is the 149% of that of Oochikara ; the number of vessel Ⅱ is the 321% of that of Oochikara ; and the vessels arrange disorderly.

ochikara的冠根组织形态进行比较，结果表明，大力品种可观察到侧根原基及侧根，而RM1 0 9均无；RM1 0 9的原生木质部间中柱鞘细胞数目减少，为大力的 77%；后生木质部导管数增加，其导管I的数量为大力的 1 4 9%，其导管Ⅱ的数量为大力的 3 2 1 %，且导管排列散乱。

Scalariform thickening A type of secondary wall formation consisting of interlaced helical bands of thickening giving a ladderlike formation. It allows for very little further extension, and is found in tissues such as metaxylem tracheids and vessels, which do not elongate after maturation.

梯纹加厚：是植物细胞次生壁的一种形态结构，壁由加厚过程中相互交错成梯状形态的螺旋带形成，其可延伸性很小，多存在于后生木质部管胞和导管等一些成熟后便不再延伸的管状分子中。

With the lapse of breeding years, the cultivars tended to have less root, shorter root length, larger active root absorption area, and smaller diameter of metaxylem vessel of seminal roots.

在以提高产量潜力为宗旨的品种更新替代过程中，不同年代春小麦品种随着年代推进逐渐呈现出根条数和根长减小、根活性吸收面积比增加、种子根中央大导管直径减小的趋势。

The time order of lignin deposition was:protoxylem vessel＞fiber＞metaxylem vessel=stone cell＞ground tissue parenchyma cell.

在纤维和基本薄壁组织细胞增厚中期，CMTs均存在解聚现象，但其特征有所不同。

The protoxylem vessels initiated lignification in the early stage of vascular bundle differentiation, whereas metaxylem vessels and fiber walls started lignification from the middle lamella and cell comers after completion of vascular bundle differentiation. The walls of most parenchyma cells lignified after the stem reached its full height, while a few parenchyma cells remained non-lignified even the culm is 7 years old.

研究结果表明：毛竹茎的原生木质部导管在维管束发育早期就已木质化；后生木质部导管和纤维细胞在维管束分化完成后，自胞间层和细胞角隅处开始木质化；基本薄壁组织细胞木质化的发生较晚，通常在茎的节间完成伸长生长后才开始，但也有少数薄壁组织细胞始终保持非木质化的薄壁状态。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。