ABSTRACT

The aim of this study was to investigate the optimum time for γ-aminobutyric acid (GABA) application to improve the yield and quality in fragrant rice. Pot and field experiments were conducted during 2016–17 with two fragrant rice cultivars (for pot experiment), and five fragrant rice cultivars (for field experiment) which were applied with five GABA levels i.e. no GABA application (CK), application of GABA at 250 mg l⁻¹ with 25 ml pot⁻¹ at tillering stage (S1), panicle initiation stage (S2), heading stage (S3), and at tillering, panicle initiation and heading stages (S4) in the pot experiment. Similarly, the same treatments with 100 ml m⁻² were applied to all rice cultivars in the field experiment. The S3 treatment significantly increased the 2-acetyl-1-pyrroline (2AP) contents in Meixiangzhan2 (14.76%) and Yuxiangyouzhan (20.19%) in pot experiment, Meixiangzhan2 (27.27%), Yuxiangyouzhan (40.24%), Basmati (43.07%) and Yungengyou14 (13.66%) in field experiment owing to regulations in the contents of proline, ^Δ1-pyrroline-5-carboxylic acid (P5C), GABA and the activities of enzymes involved in 2AP formation. The GABA treatments improved yield and modulated the antioxidant enzyme activities. This study provides a reference for the GABA application to improve yield and quality in fragrant rice.

摘要

这项研究的目的是研究γ-氨基丁酸（GABA）的最佳施用时间，以提高香米的产量和品质。在2016–17年期间进行了盆栽和田间试验，其中两个香米品种（用于盆栽实验）和五个香米品种（用于田间实验）均以五个GABA水平施用，即不施用GABA（CK），不施用GABA在分experiment阶段（S1），穗开始阶段（S2），抽穗阶段（S3）以及分the，穗开始和抽穗阶段（S4）的分ml期（S1），穗分阶段（S4）和25 ml盆栽^-1的250 mg l ^-1。同样，100 ml m ^-2的相同处理在田间试验中将其应用于所有水稻品种。S3处理在盆栽试验，梅香占2（27.27％），玉香有占（40.24％），巴斯马蒂（43.07％）的盆栽实验中显着提高了梅香占2（14.76％）和玉香右占（20.19％）的2-乙酰基-1-吡咯啉（2AP）含量。和Yungengyou14（13.66％）在田间试验由于在脯氨酸的内容规定，^Δ -1-吡咯啉-5-羧酸（P5C），GABA以及参与形成2AP酶的活性。GABA处理提高了产量并调节了抗氧化酶的活性。该研究为GABA在提高香米产量和品质方面的应用提供了参考。