Carrot (Daucus carota L.) Seed Germination Was Promoted by Hydro-Electro Hybrid Priming Through Regulating the Accumulation of Proteins Involved in Carbohydrate and Protein Metabolism

Abstract

Asynchronized and non-uniform seed germination is causing obstacles to the large-scale cultivation of carrot (Daucus carota L.). In the present study, the combination of high voltage electrostatic field treatment (EF) with hydropriming (HYD), namely hydro-electro hybrid priming (HEHP), significantly improved all germination indicators of carrot seeds, and the promoting effect was superior to that of the HYD treatment. A tandem mass tags (TMT)-based proteomic analysis identified 4,936 proteins from the seeds, and the maximum number of differentially abundant proteins (DAPs) appeared between CK and HEHP. KEGG analysis revealed that the upregulated DAPs were mainly enriched in the pathways related to protein synthesis and degradation such as “ribosome” and “proteasome,” while the downregulated DAPs were mainly enriched in photosynthesis-related pathways. Furthermore, the maximum DAPs were annotated in carbohydrate metabolism. Some proteins identified as key enzymes of the glyoxylate cycle, the tricarboxylate cycle, glycolysis and the pentose phosphate pathway showed enhanced abundance in priming treatments. The activities of several key enzymes involved in carbohydrate metabolism were also enhanced by the priming treatments, especially the HEHP treatment. Real-time quantitative PCR (qRT-PCR) analysis revealed that the effect of priming is mainly reflected before sowing. In conclusion, the optimal effect of HEHP is to regulate the synthesis and degradation of proteins in seeds to meet the requirements of germination and initiate the utilization of seed storage reserves and respiratory metabolism. The present work expanded the understanding of the response mechanism of carrot seed germination to priming and the biological effects of high voltage electrostatic field.

The effect of high voltage electrical discharge (HVED) treatment on small seed plants

“…Namely, HVED-exposed mallow seeds had 156% (2 nd day) and 90% (5 th day) higher germination percentage than untreated whilst HVED treated carrot seeds increased germination percentage by 19.4% (3 rd day), 3.5% (4 th day), 9.5% (6 th day), and 8.2% (9 th day), respectively. The study related to the impact of hydro-electro hybrid priming (HEHP) on carrot seed germination reveals beneficial effect towards classical hydropriming method (Zhao et al, 2022). The major findings of this study showed that HEHP treatment had ability to regulate the activity of differentially abundant proteins (DAPs) which control seed storage reserve and respiration metabolism.…”

“…Carrot seeds germination has been reported to increase by hydro-electro hybrid priming. Proposed mechanism is given in (Zhao et al 2022). The aim of this study was to investigate the possibilities of HVED treatment application to small seeds in a need of scarification due to physical dormancy or showing insufficient or uneven germination.…”

Changes in Medicago truncatula seed proteome along the rehydration–dehydration cycle highlight new players in the genotoxic stress response

“…The proteomic profiles of aged and melatonin-primed oat ( Avena sativa L.) seeds revealed that improved antioxidant capacity and restoration of membrane integrity were essential to promote germination performance ( Yan and Mao, 2021 ). The impact of hydro-electro hybrid priming applied to carrot ( Daucus carota L.) seeds was explored through proteomics, highlighting the concerted regulation of protein synthesis and degradation, and respiratory metabolism ( Zhao et al., 2022 ).…”