Seed phytic acid concentration affects rice seedling vigor irrespective of soil phosphorus bioavailability
Seed phytic acid concentration affects rice seedling vigor irrespective of soil phosphorus bioavailability
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DOI：
10.1111/ppl.13913
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发表时间：
2023-05-01
影响因子：
6.4
通讯作者：
Saito，Hiroki
中科院分区：
文献类型：
--
作者：
Oo，Aung Zaw;Asai，Hidetoshi;Saito，Hiroki
具有黑色果皮的大米（以下称为黑米）是众所周知的富含抗氧化剂的食物，但高谷物植酸（PA）浓度会影响其营养品质。然而，植酸有助于提高幼苗活力，这对促进随后的植物生长至关重要。本研究以黑稻和白色稻为材料，研究了不同植酸浓度对水稻幼苗活力的影响。在第一个实验中，测试了低（LPA，每粒种子15.5 mg g− 1）、中（MPA，每粒种子24.7 mg g− 1）和高（HPA，每粒种子35.4 mg g− 1）三种植酸浓度的黑米种子在缺磷土壤中的幼苗活力。HPA幼苗表现出显着增加幼苗活力和地上部磷吸收由于早期根系发育和增强的生理过程。磷胁迫下，LPA处理的幼苗乙烯释放量增加，乙烯释放量增加是植物在磷胁迫下调节幼苗生长的主要生理机制。在第二个试验中，在低磷和高磷条件下，测定了黑、白色水稻种子中三种植酸的浓度。同样，在缺磷土壤中，两个水稻品种的LPA幼苗表现出明显降低的幼苗活力。有趣的是，种子植酸和外部施磷对幼苗活力有加性效应，表明联合效应进一步提高了幼苗生长。我们的研究结果表明，具有HPA浓度的黑米种子可以用作水稻植物在缺磷生态系统中种植的种子来源，因为它们可以增加幼苗活力和随后的生长，从而减少对有限P资源的依赖。
Rice with a black‐colored pericarp (hereafter, black rice) is well‐known as an antioxidant‐rich food, but a high grain phytic acid (PA) concentration affects its nutritional quality. However, phytic acid helps improve seedling vigor, which is crucial for enhancing subsequent plant growth. This study investigated the effect of seed phytic acid concentration in black rice on seedling vigor compared to the effects on white rice. In the first experiment, three phytic acid concentrations in the seeds of black rice, low (LPA, 15.5 mg g−1per seed), medium (MPA, 24.7 mg g−1per seed), and high (HPA, 35.4 mg g−1per seed) were tested for seedling vigor in phosphorus‐deficient soils. The HPA seedlings showed substantially increased seedling vigor and shoot P uptake due to early root development and enhanced physiological processes. LPA grown seedlings showed increased ethylene production in response to P stress, which is the main physiological mechanism modulating seedling growth under P stress conditions. In the second experiment, the three phytic acid concentrations in black and white rice seeds were tested under low and high soil P conditions. Again, LPA seedlings showed significantly reduced seedling vigor in both rice varieties in P‐deficient soils. Interestingly, seed phytic acid and external P application had an additive effect on seedling vigor, suggesting that the combined effect further improved seedling growth. Our results reveal that black rice seeds with a HPA concentration can be used as a seed source for planting in P‐deficient ecosystems for rice plants as they can increase seedling vigor and subsequent growth, thus reducing dependence on finite P resources.