Wan Yingling, Zhang Yixuan, Zhang Min, Hong Aiying, Yang HuiYan, Liu Yan
College of Landscape Architecture, Beijing Forestry University, Beijing, Beijing, P. R. China.
Management Office, Caozhou Peony Garden, Heze, Shandong province, P. R. China.
PeerJ. 2020 Jun 9;8:e9316. doi: 10.7717/peerj.9316. eCollection 2020.
Insufficient light intensity inhibits the growth of cultivated herbaceous peony and decreases its economic value. Owing to the increased demand for shade-tolerant herbaceous peony, the selection of appropriate parents for hybridization is essential. , and can grow under shade conditions in their natural habitats; however, their photosynthetic capacities under shade have not been studied. In this study, we simulated low light intensity (30% sunlight) and evaluated the morphological, photosynthetic and chlorophyll fluorescence parameters of these three species. Moreover, the shade tolerance of these species as well as two common cultivars ( 'Da Fugui', which is suitable for solar greenhouse cultivation, and 'Qiao Ling', which is not suitable for solar greenhouse cultivation) was evaluated. The results showed that under shade, the leaf area of and increased, the single flowering period of and was prolonged, and the flower color of faded. With respect to , and , shade eliminated the photosynthetic 'lunch break' phenomenon and decreased photoinhibition at midday. Furthermore, the maximum photochemical efficiency (Fv/Fm) and maximum primary photochemical yield (Fv/Fo) of photosystem II (PSII) in the three species improved significantly, and their changes in light dissipation were different. The shade tolerance of the tested accessions was in the order > > > 'Da Fugui' > 'Qiao Ling', showing that the three wild species were better adapted to low light intensity than the cultivars. Thus, , and could potentially be used in the development of shade-tolerant herbaceous peony cultivars.
光照强度不足会抑制栽培芍药的生长并降低其经济价值。由于对耐荫芍药的需求增加，选择合适的杂交亲本至关重要。[此处原文缺失具体物种名]、[此处原文缺失具体物种名]和[此处原文缺失具体物种名]在其自然生境中能够在遮荫条件下生长；然而，它们在遮荫条件下的光合能力尚未得到研究。在本研究中，我们模拟了低光照强度（30%阳光），并评估了这三个物种的形态、光合和叶绿素荧光参数。此外，还评估了这三个物种以及两个常见品种（适合日光温室栽培的‘大富贵’和不适合日光温室栽培的‘巧玲’）的耐荫性。结果表明，在遮荫条件下，[此处原文缺失具体物种名]和[此处原文缺失具体物种名]的叶面积增加，[此处原文缺失具体物种名]和[此处原文缺失具体物种名]的单花期延长，[此处原文缺失具体物种名]的花色变淡。对于[此处原文缺失具体物种名]、[此处原文缺失具体物种名]和[此处原文缺失具体物种名]而言，遮荫消除了光合“午休”现象，并降低了中午的光抑制。此外，这三个物种中光系统II（PSII）的最大光化学效率（Fv/Fm）和最大原初光化学产量（Fv/Fo）显著提高，并且它们在光耗散方面的变化有所不同。供试材料的耐荫性顺序为[此处原文缺失具体物种名]>[此处原文缺失具体物种名]>[此处原文缺失具体物种名]>'大富贵'>'巧玲'，表明这三个野生种比栽培品种更能适应低光照强度。因此，[此处原文缺失具体物种名]、[此处原文缺失具体物种名]和[此处原文缺失具体物种名]有可能用于耐荫芍药品种的培育。
