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首页> 美国卫生研究院文献>Springer Open Choice >Winter peridermal conductance of apple trees: lammas shoots and spring shoots compared
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Winter peridermal conductance of apple trees: lammas shoots and spring shoots compared

机译：苹果树的冬季表皮电导：冬笋和春笋比较

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摘要

Lammas shoots are flushes formed by some woody species later in the growing season. Having less time to develop, tissue formation is suggested to be incomplete leading to a higher peridermal water loss during consecutive months. In this study, we analysed morphological and anatomical parameters, peridermal conductance to water vapour and the level of native embolism in mid-winter and late-winter of lammas shoots and normal spring shoots of the apple varieties Malus domestica ‘Gala’ and ‘Nicoter’. Lammas shoots showed a significantly higher shoot cross-sectional area due to larger pith and corticular parenchyma areas. In contrast, phloem was significantly thicker in spring shoots. No pronounced differences were observed in xylem and collenchyma thickness or mean hydraulic conduit diameter. The phellem of spring shoots was composed of more suberinised cells compared to lammas shoots, which led to a significantly higher peridermal conductance in the latter. The amount of native embolism in mid-winter did not differ between shoot types, but in late-winter lammas shoots were more embolised than spring shoots. Data show that the restricted vegetation period of lammas shoots affects their development and, in consequence, their transpiration shield. This may also pose a risk for winter desiccation.
机译：南丫芽是在生长季节后期由一些木本物种形成的同花顺。发育时间短，建议组织形成不完整，导致连续几个月内皮周水分流失增加。在这项研究中，我们分析了苹果品种Malus domestica'Gala'和'Nicoter'的冬笋和冬笋的初冬和初冬的形态学和解剖学参数，对水蒸气的表皮电导率和天然栓塞水平。 。由于较大的髓和皮质薄壁组织区域，南丫芽显示出明显更高的芽截面积。相反，春季芽中韧皮部明显较浓。在木质部和肾盂厚度或平均液压导管直径上未观察到明显差异。与lammas芽相比，春季新芽的叶状体由更多的亚精化细胞组成，这导致后者的周皮电导率明显更高。冬中原生栓塞的数量在不同类型的新梢之间没有差异，但在冬末的羔羊中，与春季新梢相比，栓塞程度更高。数据表明，矮林新梢的受限制的植被期会影响其发育，进而影响其蒸腾作用。这也可能带来冬季干燥的风险。

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