Galindo-Rodríguez Lyda Constanza, Sterling Armando, Muñoz-Ramirez Herminton, Fonseca-Restrepo Jesica Andrea
Doctoral Program in Natural Sciences and Sustainable Development, Faculty of Agricultural Sciences, Universidad de la Amazonia, Florencia 180001, Colombia.
Laboratory of Phytopathology, Amazonian Scientific Research Institute Sinchi, Faculty of Basic Sciences, Universidad de la Amazonia, Florencia 180001, Colombia.
Plants (Basel). 2023 Oct 20;12(20):3627. doi: 10.3390/plants12203627.
The cultivation of , the primary commercial source of natural rubber, is strongly impacted by South American leaf blight (SALB) disease, caused by the fungus . Various management strategies have been implemented, including the selection of resistant genotypes and the identification of escape zones. This study evaluated the growth, early yield, and resistance to SALB of nine Colombian elite genotypes from the ECC-100 series and IAN 873 clone (control) in a large-scale clone trial in an area with low SALB pressure in the Colombian Amazon during 2017-2020. Favorable early performance was evident, although there was a significant increase in the severity and sporulation of over time, especially in the ECC 35, ECC 60, and IAN 873 genotypes. However, these scores indicate low susceptibility. Genotypes with higher resistance to SALB demonstrated greater growth and early yield compared to more highly susceptible genotypes. The ECC 64, ECC 73, ECC 90, ECC 25, and ECC 29 genotypes were more desirable in low SALB pressure zones due to their higher resistance and early performance. It is important to highlight that this research contributes to the selection of new SALB-resistant Colombian genotypes of . However, it is also necessary to evaluate the productivity of these selections in the mature stage and long-term resistance to SALB before recommending and promoting their commercial adoption in the Colombian Amazon.
天然橡胶的主要商业来源—— 的种植受到由真菌引起的南美叶疫病（SALB）的严重影响。人们已实施了各种管理策略，包括选择抗性基因型和确定避病区域。本研究在2017 - 2020年期间于哥伦比亚亚马逊地区SALB压力较低的一个区域进行的大规模无性系试验中，评估了来自ECC - 100系列的9个哥伦比亚优良基因型以及IAN 873无性系（对照）对SALB的生长、早期产量和抗性。尽管随着时间推移， 的严重程度和产孢量显著增加，尤其是在ECC 35、ECC 60和IAN 873基因型中，但早期表现良好。然而，这些评分表明易感性较低。与更易感的基因型相比，对SALB具有更高抗性的基因型表现出更大的生长量和早期产量。由于ECC 64、ECC 73、ECC 90、ECC 25和ECC 29基因型具有更高的抗性和早期表现，因此在SALB压力较低的区域更具优势。必须强调的是，本研究有助于筛选新的哥伦比亚抗SALB 基因型。然而，在推荐并促进其在哥伦比亚亚马逊地区商业化种植之前，还需要评估这些筛选品系在成熟阶段的生产力以及对SALB的长期抗性。
