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Obtaining pepper F2:3 lines with resistance to the bacterial spot using the pedigree method

机译：使用谱系方法获得对细菌斑病具有抗性的辣椒F2：3品系

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The economic importance of sweet pepper is rising in Brazil and abroad. Nevertheless, diseases, such as the bacterial spot (Xanthomonas campestris pv. vesicatoria or Xanthomonas euvesicatoria) jeopardize its yield. An efficient method for controlling the disease is the use of resistant varieties. The objective of this work was to select sweet pepper genotypes with resistance to the bacterial spot on a segregating population (Capsicum annum accessions UENF 1421, susceptible, x UENF 1381, resistant), advanced using the pedigree method. Three selection procedures, " selection between and within families" , " mass selection" , and " combined selection" were compared. Fifty-six F2:3 families (40 plants per family) were planted in the field, without replication. Ten plants of each genitor were used as controls in each line, between families. Plants were inoculated (isolate ENA 4135) 42 days after transplanting and leaves were collected and digitalized three weeks after. Images were analyzed to obtain the percentage of leaf tissue damaged (RMB%) and leaf damaged area (RMBcm2). Since similar results were achieved using either RMB% or RMBcm2, we suggest using RMB% in further studies instead of RMBcm2, which values remain close to zero. Eleven lines had promising results when selection within and among F2:3 families was used (genetic gains = 40%). Considering mass selection, eleven individuals (three lines), were selected (genetic gains = 28%). Based on combined selection, three lines (11 individuals within the lines) were selected (genetic gains = 266%). There were three lines (105, 475, and 517) in common between selection among and within families and mass selection, and another three (111, 260, and 313), between selection among and within families and combined selection. Combined selection was 6.6 (RMB%) and 6.5 (RMBcm2) times more efficient than selection among and between families, and 9.6 (RMB%) and 9.5 (RMBcm2) times more efficient than mass selection.
机译：甜椒的经济重要性在巴西和其他国家正在上升。然而，诸如细菌斑点（黄单胞菌Pv。vesicatoria或Xanthomonas euvesicatoria）之类的疾病危害其产量。控制病害的有效方法是使用抗病品种。这项工作的目的是选择对谱系方法先进的，对分离种群上的细菌斑病具有抗性的甜椒基因型（辣椒品种，UENF 1421，易感，x UENF 1381，具有抗性）。比较了三个选择程序，“家庭之间和家庭内部的选择”，“大量选择”和“组合选择”。在田间种植了56个F2：3科（每个科40株），没有重复。每个家族的十株植物被用作各系之间的对照。移植后42天接种植物（分离ENA 4135），三周后收集叶片并数字化。分析图像以获得受损的叶片组织百分比（RMB％）和受损的叶片面积（RMBcm2）。由于使用RMB％或RMBcm2获得了相似的结果，我们建议在进一步的研究中使用RMB％代替RMBcm2，该值仍然接近零。当在F2：3家族内和当中进行选择时，有11个品系具有良好的结果（遗传增益= 40％）。考虑到群体选择，选择了11个人（三系）（遗传增益= 28％）。基于组合选择，选择了三个品系（品系中的11个个体）（遗传增益= 266％）。家庭之间和家庭内部选择与群体选择之间共有三行（105、475和517），家庭之间和内部选择与组合选择之间另有三行（111、260和313）。组合选择比家庭间和家庭间选择的效率高6.6（RMB％）和6.5（RMBcm2）倍，比群体选择的效率高9.6（RMB％）和9.5（RMBcm2）倍。

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