Martins L D, Rodrigues W N, Machado L S, Brinate S V B, Colodetti T V, Amaral J F T, Tomaz M A
Programa de Pós-Graduação em Produção Vegetal, Centro de Ciências Agrárias da Universidade Federal do Espírito Santo, Alegre, ES, Brasil
Programa de Pós-Graduação em Produção Vegetal, Centro de Ciências Agrárias da Universidade Federal do Espírito Santo, Alegre, ES, Brasil.
Genet Mol Res. 2015 Sep 8;14(3):10576-87. doi: 10.4238/2015.September.8.19.
The expansion of agriculture to new areas in order to increase the competitiveness of coffee producing countries has resulted in cultivation expanding into regions with lower natural fertility. This scenario has created the need to differentiate genotypes of Conilon coffee based on their tolerance to low levels of nutrients in the soil, especially phosphorus, which imposes high limitations on crop yield in tropical regions. In this context, the objective of this study was to identify differential tolerance among genotypes of Conilon coffee cultivated in environments with different levels of phosphorus availability in the soil. The experiment was conducted in a controlled environment, following a completely randomized design, with three replications in a factorial scheme 13 x 3, the factors were as follows: 13 genotypes of Conilon coffee from groups of different ripening cycles and three environments with different levels of phosphorus availability in the soil (fertilization without phosphorus supply, and phosphorus supply at 50 and 100% of recommendations). Discrimination of tolerance was based on 14 variables, including vegetative growth, accumulation of dry matter, nutrient content, and nutritional efficiencies. Estimates of genetic parameters indicated high genotypic variability for genotypes cultivated in environments with low phosphorus availability in the soil. It was possible to classify genotypes 22, 23, 24, 67, 76, 77, and 83 as tolerant of a low availability of phosphorus in the soil during early development. There was no clear relationship between ripening cycles and the tolerance of the genotypes to low phosphorus availability in the soil.
为提高咖啡生产国的竞争力，农业向新区域扩张，导致咖啡种植扩展到自然肥力较低的地区。这种情况使得有必要根据科尼伦咖啡对土壤中低养分水平（尤其是磷，其对热带地区作物产量造成很大限制）的耐受性来区分其基因型。在此背景下，本研究的目的是确定在土壤磷有效性水平不同的环境中种植的科尼伦咖啡基因型之间的差异耐受性。试验在可控环境中进行，采用完全随机设计，以13×3析因方案进行三次重复，因素如下：来自不同成熟周期组的13个科尼伦咖啡基因型，以及土壤磷有效性水平不同的三种环境（不供应磷施肥，以及按推荐量的50%和100%供应磷）。耐受性的区分基于14个变量，包括营养生长、干物质积累、养分含量和营养效率。遗传参数估计表明，在土壤磷有效性低的环境中种植的基因型具有较高的基因型变异性。在早期发育阶段，基因型22、23、24、67、76、77和83可归类为耐土壤低磷有效性。成熟周期与基因型对土壤低磷有效性的耐受性之间没有明显关系。
