Guazuma crinita is a fast-growing tree with potential for use in agroforestry systems, due to its rapid wood production, which can contribute significantly to the livelihoods of small-scale farmers in the Peruvian Amazon. However, indiscriminate logging due to high demand is leading to the disappearance of natural forests. As such, the International Council for Research in Agroforestry (ICRAF) began a domestication program to reduce pressure on natural populations of the species. The objective of the present study was to use analyses of genetic parameters, adaptability (PRVG), productivity (MHPRVG), and stability (MHVG), to select G. crinita genotypes from a three-year-old progeny test established in the Aguaytía River Basin, in Ucayali, Peru. The test was established in three different sites, with three blocks, 200 progeny per block, and two individuals per plot. The measured traits were diameter at breast height (DBH), total height (H), and total aerial biomass (B). Significant differences in traits between progenies were detected, but with no genotype x environment interaction (GxE). However, the genotypic correlation among sites was important (> 0.702), suggesting that genetic improvement is possible by selecting the same progeny across sites. The mean heritability among progenies was moderate for all traits (0.34–0.369) and selective precision through combined site analysis was relatively high (0.583–0.608). Based on selection for DBH through combined analysis, MHVG, PRVG, and MHPRVG, 50 superior progenies (25.9 %) were identified for all environments. These should be prioritized in breeding programs as they can offer stable genetic variability for future selection cycles.

中文翻译：

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Guazuma crinita 后代在秘鲁 Ucayali 的 Aguaytia 河流域三个环境中的生产力、适应性和稳定性测试

瓜祖马是一种快速生长的树木，由于其木材生产速度快，可用于农林复合系统，可为秘鲁亚马逊地区小农户的生计做出重大贡献。然而，由于需求量大而导致的滥伐导致天然林消失。因此，国际农林业研究理事会 (ICRAF) 开始了一项驯化计划，以减轻该物种自然种群的压力。本研究的目的是使用遗传参数、适应性 (PRVG)、生产力 (MHPRVG) 和稳定性 (MHVG) 的分析来选择G. crinita来自秘鲁乌卡亚利 Aguaytía 河流域的三年后代测试的基因型。该测试在三个不同的地点建立，三个区块，每个区块 200 个后代，每个小区两个个体。测量的性状是胸径 (DBH)、总高度 (H) 和总气生生物量 (B)。检测到后代之间性状的显着差异，但没有基因型 x 环境相互作用 (GxE)。然而，位点之间的基因型相关性很重要 (> 0.702)，这表明通过跨位点选择相同的后代可以实现遗传改良。所有性状的后代平均遗传力中等（0.34-0.369），通过联合位点分析的选择精度相对较高（0.583-0.608）。基于通过组合分析选择 DBH，MHVG，PRVG，和 MHPRVG，为所有环境确定了 50 个优良后代 (25.9%)。这些应该在育种计划中优先考虑，因为它们可以为未来的选择周期提供稳定的遗传变异性。