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首页> 外文期刊>Acta Horticulturae >Photoperiod affects morphology; flower productivity and photosynthesis of forced potted Paeonia lactiflora in greenhouses
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Photoperiod affects morphology; flower productivity and photosynthesis of forced potted Paeonia lactiflora in greenhouses

机译：光周期影响形态;温室盆栽Pa药的花生产力和光合作用

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摘要

Paeonia lactiflora is a sun-loving herbaceous perennial. In winter, when it is forced in greenhouses in northern China, the photoperiod is shorter than in April and May, when it grows outdoors. To find an appropriate photoperiod for forced P.lactiflora 'Da Fu Gui' (DFG) and 'Tao Hua Fei Xue' (THFX), 3 different photoperiods were provided by high-pressure sodium lamps as a supplemental lighting (SL) source (at 150-170 umolm 2-s i): 9 h/d (control, no SL), 14 h/d (5 h SL) and 18 h/d (9 h SL). Growth and photosynthetic changes were observed and the results snowed that photoperiods significantly affected flower productivity, morphology and photosynthesis of herbaceous peonies. Compared with control, the 14 h/d photoperiod increased the flowerproductivity of DFG and THFX, the crown breadth of DFG; but under 18 h/d photoperiod, DFG showed lower flower productivity, shorter stems and lower net photosynthetic rate (Pn), while the same parameters of THFX were not significantly affected. Prolonged photoperiod positively affected leaf pigment content in pre- and flowering periods of both cultivars, but leaf pigment content did not directly correlate with the P_n. Under 18 h/d photoperiod, PSII maximum potential efficiency (F_v/F_m) of DFG kept alow level, which might be responsible for lower Pn. In stem and leaf growth period, prolonged photoperiod also positively affected the leaf soluble sugar and soluble protein accumulation, but in flowering process, the contents changed differently in twocultivars. So, the mechanism of photoperiod effects on herbaceous peonies was a complex process. Overall, 14 h/d photoperiod was the best for both cultivars, and photoperiod had greater effects on DFG than on THFX.
机译：e药是多年生阳光的草本植物。在冬季，当它被迫进入中国北方的温室时，光周期要比在室外生长的四月和五月短。为了找到合适的强迫期光生太极拳“大夫鬼”（DFG）和“桃花飞雪”（THFX）的光周期，高压钠灯提供了3种不同的光周期作为补充照明（SL）源（在150-170 umolm 2-si）：9小时/天（对照，无SL），14小时/天（5小时SL）和18小时/天（9小时SL）。观察到生长和光合作用的变化，结果下雪了，光周期显着影响了草牡丹的花朵生产力，形态和光合作用。与对照相比，14 h / d的光周期提高了DFG和THFX的花生产力，这是DFG的冠幅。但是在18 h / d的光周期下，DFG表现出较低的花生产力，较短的茎和较低的净光合速率（Pn），而THFX的相同参数没有受到显着影响。长期光周期对两个品种的花前和开花期叶片色素含量均具有积极影响，但叶片色素含量与P_n不直接相关。在18 h / d的光周期下，DFG的PSII最大潜在效率（F_v / F_m）保持较低水平，这可能是导致Pn降低的原因。在茎和叶的生长期，光周期的延长对叶片可溶性糖和可溶性蛋白质的积累也有积极的影响，但在开花过程中，两个品种的含量变化不同。因此，光周期对草本牡丹的作用机理是一个复杂的过程。总体而言，14 h / d的光周期对两个品种都是最佳的，光周期对DFG的影响大于对THFX的影响。

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