Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Camino de Vera 14, Valencia, 46022, Spain.
BMC Plant Biol. 2024 Jun 15;24(1):560. doi: 10.1186/s12870-024-05235-w.
The generation of new eggplant (Solanum melongena L.) cultivars with drought tolerance is a main challenge in the current context of climate change. In this study, the eight parents (seven of S. melongena and one of the wild relative S. incanum L.) of the first eggplant MAGIC (Multiparent Advanced Generation Intercrossing) population, together with four F hybrids amongst them, five S5 MAGIC recombinant inbred lines selected for their genetic diversity, and one commercial hybrid were evaluated in young plant stage under water stress conditions (30% field capacity; FC) and control conditions (100% FC). After a 21-day treatment period, growth and biomass traits, photosynthetic pigments, oxidative stress markers, antioxidant compounds, and proline content were evaluated.
Significant effects (p < 0.05) were observed for genotype, water treatments and their interaction in most of the traits analyzed. The eight MAGIC population parental genotypes displayed a wide variation in their responses to water stress, with some of them exhibiting enhanced root development and reduced foliar biomass. The commercial hybrid had greater aerial growth compared to root growth. The four F hybrids among MAGIC parents differed in their performance, with some having significant positive or negative heterosis in several traits. The subset of five MAGIC lines displayed a wide diversity in their response to water stress.
The results show that a large diversity for tolerance to drought is available among the eggplant MAGIC materials, which can contribute to developing drought-tolerant eggplant cultivars.
在当前气候变化的背景下，培育具有耐旱性的茄子新品种是一个主要挑战。在这项研究中，茄子 MAGIC（多亲本高级世代互交）第一代群体的 8 个亲本（7 个茄子和 1 个野生近缘种 S. incanum L.），以及其中的 4 个 F1 杂种、5 个 S5 MAGIC 重组自交系（因遗传多样性而选择）和 1 个商业杂种，在幼苗期分别在水分胁迫条件（田间持水量的 30%；FC）和对照条件（100% FC）下进行了评估。经过 21 天的处理期后，评估了生长和生物量性状、光合色素、氧化应激标志物、抗氧化化合物和脯氨酸含量。
基因型、水分处理及其互作在大多数分析的性状中均有显著影响（p<0.05）。8 个 MAGIC 群体亲本基因型对水分胁迫的反应表现出广泛的变异性，其中一些表现出增强的根系发育和减少的叶片生物量。商业杂种的地上生长大于根系生长。MAGIC 亲本的 4 个 F1 杂种在表现上存在差异，其中一些在几个性状上表现出显著的正或负杂种优势。MAGIC 系的 5 个亚系在对水分胁迫的反应上表现出广泛的多样性。
结果表明，茄子 MAGIC 材料中存在大量的耐旱性多样性，可以为培育耐旱性茄子品种做出贡献。
