ABSTRACT

2-acetyl-1-pyrroline (2AP) is recognized as the key aromatic compound in fragrant rice, however, the effect of light quality on rice aroma is not fully understood. In this study, two fragrant rice varieties (Xiangyaxiangzhan and Yuxiangyouzhan) were grown under four light quality treatments (CK: natural light, L1: red light, L2: blue light and L3: combined light). Results depicted that L1, L2 and L3 treatments enhanced the grain yield by 14.24–35.36%, compared to CK whilst L2 and L3 treatments reduced the 2AP content in grains by 17.18–28.68%. Moreover, L1, L2 and L3 treatments enhanced the grain yield owing to improved filled grain percentage and regulation in antioxidant enzyme activities. On the other hand, L2 and L3 reduced the 2AP content in grains by decreasing pyrroline-5-carboxylic acid content and modulating proline and γ-aminobutyric acid content. Overall, this study revealed that light quality substantially affects the grain yield and quality characters of fragrant rice.

摘要

2-乙酰基-1-吡咯啉（2AP）被认为是香米中的关键芳香化合物，但是，光质量对大米香气的影响尚不完全清楚。在这项研究中，两个香型水稻品种（湘雅香战和玉香油展）在四种光质处理下（CK：自然光，L1：红光，L2：蓝光和L3：组合光）进行了种植。结果表明，与CK相比，L1，L2和L3处理使籽粒产量提高了14.24-35.36％，而L2和L3处理使籽粒中2AP含量降低了17.18-28.68％。此外，L1，L2和L3处理由于提高了实粒率和抗氧化酶活性的调节而提高了谷物产量。另一方面，L2和L3通过降低吡咯啉-5-羧酸含量和调节脯氨酸和γ-氨基丁酸含量来降低谷物中的2AP含量。总的来说，这项研究表明，光的质量会大大影响香米的籽粒产量和品质特性。