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首页> 外文期刊>Journal of Experimental Botany >The peripheral xylem of grapevine (Vitis vinifera) berries. 2. Anatomy and development
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The peripheral xylem of grapevine (Vitis vinifera) berries. 2. Anatomy and development

机译：葡萄（Vitis vinifera）浆果的外围木质部。 2.解剖与发展

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It has been hypothesized that the substantial reductions in xylemic water flow occurring at veraison are due to physical disruption (breaking) of the xylem as a result of renewed berry growth. In a companion paper, evidence was presented that the vast majority of xylem tracheary elements remained intact despite the growth of the berry, and it was proposed that existing tracheary elements stretch to accommodate growth and that additional elements may also differentiate after veraison. Measurements of the intergyre distance of tracheary elements in macerated tissue were used to test for stretching, and the numbers of tracheary elements per vascular bundle and of branch points of the peripheral xylem network were analysed to test for continued differentiation from 18 to 120 d after anthesis in Chardonnay berries. The distance between the epidermis and the vasculature increased substantially from pre- to post-veraison, potentially increasing the amount of skin available for analysis of compounds important for winemaking. Tracheary elements continued to differentiate within the existing vascular bundles throughout berry development. Additional vascular bundles also appeared until after veraison, thereby increasing the complexity of the peripheral vascular network. The results also confirmed that tracheary elements stretched by ∼20%, but this was not as much as that predicted based on the growth of the vascular diameter (40%). These results complete a comprehensive evaluation of grape berry peripheral xylem during its development and show that tracheary development continues further into berry maturation than previously thought.
机译：据推测，由于再生浆果的生长，木质部的物理破坏（破坏）是由于在物理上发生的木质部水流的大量减少。在随附的论文中，有证据表明，尽管浆果生长，绝大多数木质部气管元件仍保持完整，有人提出，现有的气管元件可以拉伸以适应生长，并且其他元素在验证后也可以区分。测量浸软组织中气管元件的回旋距离来测试拉伸，分析每个血管束的气管元件数和外周木质部网络的分支点，以测试花后18到120 d的持续分化在霞多丽浆果中。从检验前到检验后，表皮和脉管系统之间的距离大大增加，潜在地增加了可用于分析对于酿酒重要的化合物的皮肤数量。在整个浆果发育过程中，气管成分在现有血管束中继续分化。额外的血管束也会出现，直到检查结束，从而增加了周围血管网络的复杂性。结果还证实，气管元件可伸展约20％，但这不及基于血管直径增长所预测的（40％）。这些结果完成了对葡萄浆果外围木质部在其发育过程中的综合评估，并表明气管发育持续到浆果成熟为止比以前想象的要深。

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