Abstract Inga vera Willd. subsp. affinis (DC.) T.D.Penn. is a main component of riparian forests, widely used in agroforestry in many parts of tropical south America and can thrive in a variety of environments that include sites that are flooded for up to six months. Here, we contribute a wood anatomical study in flooded versus non-flooded environments to discover features that enable the wide environmental plasticity of this species. Population differences in anatomical and structural traits point to a drought adaptation syndrome in the flooded population sample. Four anatomical traits, vessel lumen diameter, intervessel pit diameter, fiber lumen diameter and fiber length showed significant population differences. Further, scanning electron microscopy revealed qualitative differences in vestures on the inside walls of vessel elements. Our results support the view that flood conditions can paradoxically induce physiological drought stress due to anaerobic conditions in the root zone, which leads to physiological and structural features normally observed in drought-adapted tree populations. Our observations also suggest that planting stock obtained from flooded areas may contain adaptive traits that could also be useful for cultivation and land reclamation applications under drier conditions that are anticipated in the future due to climate change.

中文翻译：

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Inga vera subsp.种群的干旱适应。阿菲尼斯 (DC.) TDPenn. 暴露于广泛的季节性洪水中

摘要印加维拉威尔德。亚种 阿菲尼斯 (DC.) TDPenn. 是河岸森林的主要组成部分，广泛用于南美洲热带许多地区的农林业，可以在各种环境中茁壮成长，包括被洪水淹没长达六个月的地点。在这里，我们在洪水与非洪水环境中进行了木材解剖学研究，以发现使该物种具有广泛环境可塑性的特征。解剖和结构特征的种群差异表明被洪水淹没的种群样本中存在干旱适应综合征。血管腔直径、血管间凹直径、纤维腔直径和纤维长度四种解剖学特征显示出显着的群体差异。此外，扫描电子显微镜显示血管元件内壁上的外衣存在质的差异。我们的结果支持这样的观点，即由于根区的厌氧条件，洪水条件会自相矛盾地诱导生理干旱胁迫，这导致通常在适应干旱的树木种群中观察到的生理和结构特征。我们的观察结果还表明，从洪水地区获得的种植种群可能包含适应性特征，这些特征也可用于在未来由于气候变化而预期的干燥条件下进行耕作和土地开垦应用。