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The innovation of photovoltaic materials, [1][2][3][4][5] specially nonfullerene acceptors (NFAs), has pioneered many research hot spots of organic solar cells (OSCs) for in-depth exploration in the past decades. With combinational efforts devoted to molecule evolution and device engineering, the power conversion efficiency (PCE) of single-junction solar cells has approached up to 19%. [6][7][8] Various NFAs have been developed in recent years, such as diketopyrrolopyrrole (DPP) or perylene diimide (PDI) contained molecules, [9][10][11] A-D-A-type acceptors, i.e., ITIC, [12,13] M series [14] and Y series molecules, [15][16][17][18] typically Y6. [19] Core engineering has been demonstrated effective to achieve highperformance NFAs, as molecular conjugation and intramolecular charge transfer (ICT) can be readily realized through introducing or removing the aromatic rings on the backbone of NFAs. Additionally, the asymmetric strategy was adopted for molecule modification, which could precisely regulate the intrinsic optoelectronic properties of NFAs. Derived from symmetric NFAs, i.e., ITIC [12] and IT-4F, [20] various A-D-A-type asymmetric NFAs have been designed and synthesized. [21,22] Sun's group designed asymmetric TPTT-2F and TPTTT-2F through extending molecular conjugation of the IDT core. [23] Along with the enhanced conjugation, redshifted

Resveratrol is a natural polyphenol compound produced in response to biotic and abiotic stresses in grape berries. However, changes in resveratrol caused by bud sport in grapes are scarcely reported. In this study, trans-resveratrol and cis-resveratrol were identified and quantified in the grape berries of ‘Summer Black’ and its bud sport ‘Nantaihutezao’ from the veraison to ripening stages using ultra performance liquid chromatography-high resolution tandem mass spectrometry (UPLC-HRMS). We found that bud sport accumulates the trans-resveratrol earlier and increases the contents of cis-resveratrol in the earlier stages but decreases its contents in the later stages. Simultaneously, we used RNA-Seq to identify 51 transcripts involved in the stilbene pathways. In particular, we further identified 124 and 19 transcripts that negatively correlated with the contents of trans-resveratrol and cis-resveratrol, respectively, and four transcripts encoding F3'5'H that positively correlated with the contents of trans-resveratrol by weighted gene co-expression network analysis (WGCNA). These transcripts may play important roles in relation to the synergistic regulation of metabolisms of resveratrol. The results of this study can provide a theoretical basis for the genetic improvement of grapes.