Exogenous application of mixed micro-nutrients improves yield, quality, and 2-acetyl-1-pyrroline contents in fragrant rice

Abstract

Lei et al.: Exogenous application of mixed micro-nutrients improves yield, quality and 2-acetyl-1-pyrroline contents in fragrant rice - Abstract. Application of micro-nutrient at low concentrations can play significant roles in yield and quality improvements as well as aromatic characters of fragrant rice. Present study investigated the exogenous mixed application of micro-nutrients on yield quality, 2-acetyle-1-pyrroline (2-AP) and mineral content accumulation in the grains of two aromatic rice cultivars i.e., Xiangyaxiangzhan and Guixiangzhan. Two mixtures containing different proportions of micro-nutrients i.e., mixture-1 (40% zinc sulfate, 6% manganese sulfate, 1% ferric chloride, 50% proline, and 3% sodium selenite) and mixture-II (containing 1% gibberellic acid, 8% zinc sulfate, potassium 76% di-hydrogen phosphate, 8% manganese sulfate, and 7% copper sulfate) were exogenous applied at full heading stage at 1.5 kg hm -2 (T1) and 3 kg hm -2 (T2) diluted in 750 L water while plots with only water application were served as control (CK). Results revealed that exogenous application of mixed micro-nutrients notably increased yield in terms of improved grain numbers per panicle, filled grain (%), 1000-grain weight, grain yield, grain 2-AP, selenium (Se) and zinc (Zn) contents while decreased amylose content, chalky rice percentage and chalkiness degree in both rice cultivars. Furthermore, exogenous application of mixed micro-nutrient enhanced above ground plant dry biomass for both rice cultivars. Significant correlations among 2-AP, Zn and Se (P≤0.05) suggested that these two micro-nutrients have dynamic roles in rice aroma production, however, to unravel the exact mechanisms of micro-nutrient involvement in 2-AP biosynthesis, further research is needed.

Transcriptomic Analysis Provides Insights into Foliar Zinc Application Induced Upregulation in 2-Acetyl-1-pyrroline and Related Transcriptional Regulatory Mechanism in Fragrant Rice

“…Mo et al demonstrated that 2AP concentrations of detached aromatic rice panicles in vitro were higher when Zn was added to the basic culture medium. Exogenous application of mixed micronutrients significantly improves the quality of aromatic rice, including the aroma of aromatic rice . Furthermore, Mo et al revealed that Si fertilization affects the 2AP content of aromatic rice by increasing the proline content and the PRODH activity in leaves and grains.…”

Relationship between 2-acetyl-1-pyrroline and aroma in Uganda rice populations with Oryza (barthi, glaberrima and sativa) backgrounds

“…In fact, Shan et al (2015) reported the creation of fragrant rice (with high 2AP content) from a nonaromatic variety by using gene editing technologies, sequence-specific nucleases and transcription activator-like effector nucleases. Despite, the significant influence of genetics on rice grain aroma, several other factors are known to contribute towards the aromatic profile of rice, and the intensity, for example soil salinity (Poonlaphdecha et al, 2012), plant nutrition (Lei et al, 2017), agronomic practices (Goufo et al, 2010), light intensity (Mo et al, 2017) and temperature (Prodhan et al, 2017). The concentration of other biological compounds such as 1-pyrroline has been directly implicated in the biosynthesis of 2AP (Prodhan et al, 2017).…”

Nitrogen application at the booting stage affects 2-acetyl-1-pyrroline, proline, and total nitrogen contents in aromatic rice

“…In addition, plant nutrition status also induces regulations in aroma contents in fragrant rice (Li et al, 2016;Lei et al, 2017). For instance, N also affects 2-AP formation in aromatic rice during its growth period (Ren et al, 2017).…”