School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China.
Institute of Future Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi, China.
Plant Signal Behav. 2023 Dec 31;18(1):2186641. doi: 10.1080/15592324.2023.2186641.
Phosphorus (P) is an indispensable nutrient for seed germination, but the seeds always store excessive P over demand. High-P seeds of feeding crops lead to environmental and nutrition issues, because phytic acid (PA), the major form of P in seeds, cannot be digested by mono-gastric animals. Therefore, reduction of P level in seeds has become an imperative task in agriculture. Our study here suggested that both and , two vacuolar phosphate transporters responsible for vacuolar Pi sequestration, were downregulated in leaves during the flowering stage, which led to less Pi accumulated in leaves and more Pi allocated to reproductive organs, and thus high-P containing seeds. To reduce the total P content in seeds, we genetically regulated VPT1 during the flowering stage and found that overexpression of VPT1 in leaves could reduce P content in seeds without affecting the production and seed vigor. Therefore, our finding provides a potential strategy to reduce the P level of the seeds to prevent the nutrition over-accumulation pollution.
磷（P）是种子萌发必不可少的营养物质，但种子总是储存过量的 P 以满足需求。饲料作物的高 P 种子会导致环境和营养问题，因为种子中主要形式的磷是植酸（PA），不能被单胃动物消化。因此，降低种子中的 P 水平已成为农业的当务之急。我们的研究表明，在开花期，负责液泡 Pi 螯合的两个液泡磷酸盐转运蛋白 和 在叶片中下调，导致叶片中 Pi 积累减少，更多的 Pi 分配到生殖器官，从而产生高 P 含量的种子。为了降低种子中的总 P 含量，我们在开花期对 VPT1 进行了遗传调控，发现叶片中 VPT1 的过表达可以降低种子中的 P 含量，而不影响产量和种子活力。因此，我们的发现为降低种子中的 P 水平以防止营养过度积累污染提供了一种潜在策略。
