Abstract The main aim of the present study was to explore the effect of chelating selenium (Se) on aromatic rice performance. A field experiment was conducted in 2017 and 2018. At initial heading stage, five different Se solutions of 0, 10, 20, 30 and 40 μmol L−1 were applied to rice leaves and named as CK, Se1, Se2, Se3 and Se4 treatments, respectively. The results showed 1.64–10.78 % higher seed-setting rate and 2.17–6.98 % higher 1000-grain weight in the chelating Se treatments than in the CK. Compared with the CK, the Se2 and Se3 treatments increased the grain yield and net photosynthetic rate by 8.24–14.65 % and 8.00–24.74 %, respectively. The Se2 and Se3 treatments also increased grain protein contents and reduced both the chalky rice rate and chalkiness. Moreover, the Se1, Se2 and Se3 treatments increased the grain content of 2-acetyl-1-pyrroline (2-AP) by 15.02–47.47 % compared with CK. The contents of proline, △1-pyrroline-5-carboxylic acid (P5C) and 1-pyrroline (precursors in 2-AP biosynthesis) and the activities of proline dehydrogenase (ProDH), ornithine aminotransferase (OAT), and diamine oxidase (DAO) were also improved under the Se1, Se2 and Se3 treatments compared to CK. Furthermore, the chelating Se applications improved the total Se and Fe content in grains. The Se2 treatment was considered as the optimum concentration for chelating Se application in fragrant rice production.

中文翻译：

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香米中螯合硒的生物强化：对光合速率、香气、谷物品质和产量形成的影响

摘要 本研究的主要目的是探讨螯合硒（Se）对香米性能的影响。2017 年和 2018 年进行了田间试验。在抽穗初期，将 0、10、20、30 和 40 μmol L−1 的 5 种不同硒溶液施于水稻叶片上，命名为 CK、Se1、Se2、Se3 和 Se4分别治疗。结果表明，螯合硒处理的结实率比 CK 高 1.64-10.78%，千粒重高 2.17-6.98%。与CK相比，Se2和Se3处理分别使籽粒产量和净光合速​​率提高了8.24-14.65%和8.00-24.74%。Se2 和Se3 处理还增加了谷物蛋白质含量并降低了白垩米率和垩白度。此外，Se1，与 CK 相比，Se2 和 Se3 处理使 2-乙酰基-1-吡咯啉 (2-AP) 的谷物含量增加了 15.02-47.47%。脯氨酸、△1-吡咯啉-5-羧酸（P5C）和1-吡咯啉（2-AP生物合成的前体）的含量及脯氨酸脱氢酶（ProDH）、鸟氨酸转氨酶（OAT）和二胺氧化酶（DAO）的活性) 与 CK 相比，在 Se1、Se2 和 Se3 处理下也有所改善。此外，螯合硒的应用提高了谷物中硒和铁的总含量。Se2处理被认为是香米生产中螯合Se应用的最佳浓度。与 CK 相比，Se1、Se2 和 Se3 处理下的鸟氨酸转氨酶 (OAT) 和二胺氧化酶 (DAO) 也有所提高。此外，螯合硒的应用提高了谷物中硒和铁的总含量。Se2处理被认为是香米生产中螯合Se应用的最佳浓度。与 CK 相比，Se1、Se2 和 Se3 处理下的鸟氨酸转氨酶 (OAT) 和二胺氧化酶 (DAO) 也有所提高。此外，螯合硒的应用提高了谷物中硒和铁的总含量。Se2处理被认为是香米生产中螯合硒应用的最佳浓度。