Zhipeng Sheng, Jiasong Meng, Jun Tao^*, Daqiu Zhao^*

Phyton-International Journal of Experimental Botany, Vol.92, No.11, pp. 3133-3147, 2023, DOI:10.32604/phyton.2023.028818

Abstract

Tree peony (Paeonia suffruticosa Andr.) is a traditional Chinese flower, which prefers cool weather. However, high temperature in summer in the middle and lower reaches of the Yangtze River restricts its growth and development. In this study, osmotic regulation, antioxidant enzyme activities, and photosynthetic characteristics of tree peony in response to high-temperature stress were investigated. The results showed that high-temperature stress had destroyed the cell membrane, manifested as the increased relative electrical conductivity and malondialdehyde content. Moreover, high-temperature stress led to excessive accumulation of reactive oxygen species, thereby, activating antioxidant enzyme activities. Also, photosynthetic parameters and chlorophyll fluorescence parameters directly… More >

Yinglong Song^1,#, Wenqian Shang^1,#, Zheng Wang^1,*, Songlin He^1,2,*, Xinya Meng³, Liyun Shi¹, Yuxiao Shen¹, Dan He¹, Xueyuan Lou¹, Yuke Sun¹

Phyton-International Journal of Experimental Botany, Vol.91, No.12, pp. 2791-2812, 2022, DOI:10.32604/phyton.2022.023572

Abstract Relatively poor in vitro rooting has limited the large-scale commercial production of tree peony. In this study, on the basis of transcriptome sequencing, differentially expressed genes and the associated metabolic pathways were identified in tree peony roots at different stages of root formation under sandy loam cultivation. A total of 31.63 Gb raw data were generated and 120,188 unigenes (mean length of 911.98 bp) were annotated according to six databases (NR, NT, GO, KEGG, COG, and Swiss-Prot). Analyses of the ungerminated root primordium period, induced root primordium period, and root formation period detected 8,232, 6,907, and 10,687 differentially expressed genes related… More >

Yanzhao Zhang^*, Chenyang Yu, Xi Lu, Yanwei Cheng

Phyton-International Journal of Experimental Botany, Vol.91, No.11, pp. 2505-2518, 2022, DOI:10.32604/phyton.2022.021455

Abstract Tree peony cultivars with yellow flowers are rare and valuable, but the molecular mechanism of pigment accumulation is not clear. In this study, the petal transcriptome of three developmental stages were sequenced to determine the differentially expressed genes (DEGs) regulating yellow flowers color. The results showed that 10,842 and 12,022 DEGs were screened in stage 1 vs. stage 2 and in stage 2 vs. stage 3, respectively. Through analysis of flavonoid structural genes (FSGs), we found that the transcription level of DFR was very low in the three developmental stages. In a small group of cultivars, the DFR transcription level… More >