Associating desirable agronomic characters of sweet peppers and resistance to bacterial spot (BS) has been challenging plant breeders, especially when seeking durable resistance. In this work, we select BS resistant progenies with desirable agronomic characteristics by mixed model. F2:3 plants derived from sixty F2 individuals from crosses between pure lines UENF 2285 (susceptible) × UENF 1381 (resistant) were phenotyped. For BS resistance assessment, 1320 seedlings were inoculated with Xanthomonas euvesicatoria in greenhouse. The progress of the disease on seedlings was evaluated by using a score scale, with values from one to five, for eleven consecutive days. With the values of the Area Under Disease Progress Curve (AUDPC), the components of variance were estimated, and the genetic values for resistance to bacterial spot predicted. Resistant seedlings were cultivated in the field for agronomic characters phenotyping. The average rank index was used to select promising offspring. The coefficient of additive genetic variation (12.97–32.57%) confirmed the existence of genetic variability in the population. The progeny-mean heritability was of high magnitude (80–97%), and narrow sense heritability had average magnitude (17–65%), which indicates desirable gains with the selection of individual plants. The accuracy of the selection was above 80% for all studied traits. The predicted genetic value for AUDPC was negative and the genetic gain was null; in contrast, for the IP variable and morphoagronomic characters, the predicted genetic gain was high. Thirty-three percent of promising segregation lines were selected, which should originate new pure line type sweet pepper cultivars resistant to BS.

中文翻译：

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将 REML/BLUP 和谱系关联到开发抗细菌斑病的甜椒 (Capsicum annuum L.) 后代中

将甜椒的理想农艺性状与细菌性斑点病 (BS) 抗性联系起来一直是植物育种者的挑战，尤其是在寻求持久抗性时。在这项工作中，我们通过混合模型选择具有理想农艺特性的 BS 抗性后代。F2:3 植物来自 60 个来自纯系 UENF 2285（易感）× UENF 1381（抗性）之间杂交的 F2 个体进行了表型分析。对于 BS 抗性评估，在温室中用 Xanthomonas euvesicatoria 接种了 1320 株幼苗。病害在幼苗上的进展通过使用评分量表进行评估，评分范围为 1 到 5，连续 11 天。使用疾病进展曲线下面积 (AUDPC) 的值，估计了方差分量，并预测了对细菌性斑点病抗性的遗传值。在田间培育抗病苗用于农艺性状表型分析。平均等级指数用于选择有前途的后代。加性遗传变异系数（12.97-32.57%）证实了种群中遗传变异的存在。后代平均遗传力高（80-97%），狭义遗传力平均（17-65%），这表明选择单株植物可获得可取的收益。对于所有研究的性状，选择的准确性都在 80% 以上。AUDPC 的预测遗传值为负，遗传增益为零；相比之下，对于 IP 变量和形态农艺性状，预测的遗传增益很高。选择了 33% 的有希望的分离线，