State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China.
State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Agro-innovative Demonstration Base Guangdong Academy of Agricultural Sciences, Guangzhou 510642, Guangdong, China.
Ecotoxicol Environ Saf. 2021 Apr 15;213:111941. doi: 10.1016/j.ecoenv.2021.111941. Epub 2021 Feb 7.
Cloudy weather with low light is more common during rice growing season of South China which often leads reduced yield and aroma formations in fragrant rice. However, exogenous γ-aminobutyric acid (GABA) application could enhance the 2-acetyl-1-pyrroline (2AP) accumulations and yield of fragrant rice under low light conditions. Field and pot experiments were conducted with three fragrant rice cultivars i.e., Basmati and Yuxiangyouzhan (indica), and Yungengyou 14 (japonica) that were grown under three different treatments i.e., normal light + GABA 0 mg L (CK), low light + GABA 0 mg L (T1), and low light + GABA 250 mg L (T2). The results revealed that the grain 2AP contents were increased by 14.67-34.83% and up to 29.34% under T1 and T2 treatments in pot and field experiments, respectively, as compared with CK. The T1 and T2 treatments improved aroma owing to regulation in the accumulation of micronutrients i.e., Na, Mn, and Fe and enzyme activities involved in 2AP biosynthesis. The grain yield was substantially reduced in T1 as compared with T2 treatment for all rice cultivars. On the other hand, GABA application improved the grain yield under low light conditions by regulating the plant growth, and related physiological and biochemical attributes in all rice cultivars. Thus, GABA could balance low light-induced 2AP content and grain yield by modulating morphological and yield related attributes as well as physio-biochemical responses of fragrant rice.
华南地区水稻种植季节阴天和低光照较为常见，这往往导致香稻产量和香气形成减少。然而，外源γ-氨基丁酸（GABA）的应用可以在低光照条件下提高 2-乙酰-1-吡咯啉（2AP）的积累和香稻的产量。本研究通过田间和盆栽试验，以三个香稻品种（Basmati 和 Yuxiangyouzhan，籼稻；Yungengyou 14，粳稻）为材料，在正常光照+GABA 0mg·L（CK）、低光照+GABA 0mg·L（T1）和低光照+GABA 250mg·L（T2）三种不同处理下进行试验。结果表明，与 CK 相比，T1 和 T2 处理分别使盆栽和田间试验中稻谷 2AP 含量增加了 14.67%-34.83%和 29.34%。T1 和 T2 处理通过调节参与 2AP 生物合成的微量元素 Na、Mn 和 Fe 以及相关酶的积累来改善香气。与 T2 处理相比，T1 处理所有香稻品种的产量都显著降低。另一方面，GABA 的应用通过调节所有香稻品种的植物生长及其相关生理生化特性，在低光照条件下提高了稻谷产量。因此，GABA 可以通过调节香稻的形态和产量相关特性以及生理生化反应来平衡低光照诱导的 2AP 含量和稻谷产量。
