Loss of Rose Fragrance under Chilling Stress Is Associated with Changes in DNA Methylation and Volatile Biosynthesis

Author:

Xie Limei12,Bai Xue12,Zhang Hao1,Qiu Xianqin1,Jian Hongying1ORCID,Wang Qigang1,Wang Huichun1,Feng Dedang1,Tang Kaixue1,Yan Huijun13ORCID

Affiliation:

1. Flower Research Institute of Yunnan Academy of Agricultural Sciences, Kunming 650205, China

2. Institute of Resource Plants, Yunnan University, Kunming 650000, China

3. National Engineering Research Center for Ornamental Horticulture, Kunming 650000, China

Abstract

Rose plants are widely cultivated as cut flowers worldwide and have economic value as sources of natural fragrance and flavoring. Rosa ‘Crimson Glory’, whose petals have a pleasant fragrance, is one of the most important cultivars of edible rose plants. Flower storage at low-temperature is widely applied in production to maintain quality; however, chilling results in a decrease in aromatic volatiles. To determine the molecular basis underlying the changes in aromatic volatile emissions, we investigated the changes in volatile compounds, DNA methylation patterns, and patterns of the transcriptome in response to chilling temperature. The results demonstrated that chilling roses substantially reduced aromatic volatile emissions. We found that these reductions were correlated with the changes in the methylation status of the promoters and genic regions of the genes involved in volatile biosynthesis. These changes mainly occurred for CHH (H = A, T, or C) which accounted for 51% of the total methylation. Furthermore, transcript levels of scent-related gene Germacrene D synthase (RhGDS), Nudix hydrolase 1 (RhNUDX1), and Phenylacetaldehyde reductase (RhPAR) of roses were strikingly depressed after 24 h at low-temperature and remained low-level after 24 h of recovery at 20 °C. Overall, our findings indicated that epigenetic regulation plays an important role in the chilling tolerance of roses and lays a foundation for practical significance in the production of edible roses.

Funder

Natural Science Foundation of China

Major Agricultural Science and Technology Projects in Yunnan Province

Innovation Team Project of Yunnan Province

Publisher

MDPI AG

Subject

Genetics (clinical),Genetics

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