Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentación (INIA), Universidad Politécnica de Madrid (UPM), 28223 Pozuelo de Alarcón, Spain.
Centro de Bioinformática y Simulación Molecular (CBSM), Universidad de Talca, 2 Norte 685, 3460000 Talca, Chile.
Int J Mol Sci. 2018 Jul 22;19(7):2132. doi: 10.3390/ijms19072132.
The seed is the most important plant reproductive unit responsible for the evolutionary success of flowering plants. Aside from its essential function in the sexual reproduction of plants, the seed also represents the most economically important agricultural product worldwide, providing energy, nutrients, and raw materials for human nutrition, livestock feed, and countless manufactured goods. Hence, improvements in seed quality or size are highly valuable, due to their economic potential in agriculture. Recently, the importance of indolic compounds in regulating these traits has been reported for . The transcriptional and physiological mechanisms involved, however, remain largely undisclosed. Potassium transporters have been suggested as possible mediators of embryo cell size, controlling turgor pressure during seed maturation. In addition, it has been demonstrated that the expression of K⁺ transporters is effectively regulated by auxin. Here, we provide evidence for the identification of two K⁺ transporters, (At1g60160) and (At4g23640), that are likely to be implicated in determining seed size during seed maturation and, at the same time, show a differential regulation by indole-3-acetic acid and indole-3-acetamide.
种子是植物最重要的生殖单位，是开花植物进化成功的关键。除了在植物有性生殖中的重要功能外，种子还是全球最重要的经济农产品，为人类营养、牲畜饲料和无数制成品提供能量、营养和原材料。因此，种子质量或大小的改善具有很高的经济价值，因为它们在农业中有很大的潜力。最近，人们报道吲哚化合物在调节这些特性方面的重要性。然而，涉及的转录和生理机制在很大程度上仍未被揭示。钾转运蛋白被认为是胚胎细胞大小的可能调节剂，控制种子成熟过程中的膨压。此外，已经证明生长素有效地调节 K⁺ 转运蛋白的表达。在这里，我们提供了证据，证明了两个 K⁺ 转运蛋白 （At1g60160）和 （At4g23640）的鉴定，它们可能与种子成熟过程中种子大小的决定有关，同时，它们表现出对吲哚-3-乙酸和吲哚-3-乙酰胺的差异调节。
