Coffee breeding based on root traits is important to identify productive genotypes under adverse environmental conditions. This study assessed the diversity of root traits in Coffea canephora and its correlation with plant height and crop yield. Undisturbed soil samples were collected down to 60 cm from 43 coffee genotypes, in which one of them was propagated by seed and all others by stem cutting. The roots were washed, scanned, and processed to quantify root length density, root volume, root superficial area, and root diameter. Additionally, plant height and crop yield were also assessed. Root length density ranged from 40 to 1411 mm cm⁻³, root volume from 6 to 443 mm³ cm⁻³, root superficial area from 61 to 1880 mm² cm⁻³, and root diameter from 0.6 to 1.1 mm. Roots were concentrated in the topsoil (0–20 cm) for most genotypes. In deeper depths (30–60 cm), root length density, root volume, and root superficial area were higher in genotypes 14, 25, 31, and 32. Positive correlations were found between root traits and both plant height and crop yield. The results of this work may contribute to the overall cultivation of C. canephora, specially for crop breeding in adverse environmental conditions.

中文翻译：

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基因型咖啡的根性状变异性及其与株高和作物产量的关系

基于根性状的咖啡育种对于识别不利环境条件下的生产基因型非常重要。这项研究评估了咖啡粉中根性状的多样性及其与株高和作物产量的相关性。从43种咖啡基因型中收集了60厘米以下未受干扰的土壤样品，其中一种通过种子繁殖，所有其他通过茎秆繁殖繁殖。对根进行清洗，扫描和处理，以量化根长度密度，根体积，根表浅面积和根直径。此外，还评估了株高和农作物产量。根长密度为40至1411 mm cm ^-3，根体积为6至443 mm ³ cm ^-3，根浅表面积为61至1880 mm ²cm ^-3，根部直径从0.6到1.1 mm。对于大多数基因型，根系集中在表土（0–20 cm）中。在更深的深度（30–60 cm）中，基因型14、25、31和32的根长密度，根体积和根浅表面积较高。在根性状与株高和作物产量之间发现正相关。这项工作的结果可能有助于C. canephora的整体种植，特别是在不利环境条件下的作物育种。