| Peony?Paeonia lactiflora?is the traditional flower that has always been an important garden ornamental plants in China.Recent years,the market demand for potted peony and cut flowers and its business value are also increasing.But its short and concentrated natural flowering period extremely limit the market prospect.At present,the facilitiy promote or inhibit cultivation of is a important skill to extend the flowering period of peony and meet the needs of the market.In the process of facility forcing cultivation in winter,the natural light period in greenhouse is significantly shortened than in open field,which obviously inhibited the growth and flowering of the peony.Therefore,the main purpose of this study is to explore the effect of the of LED red and blue top light module and high pressure sodium lamp?HPSL?with same light intensity(200 ?mol·m-2·s-1)on the growth and flowering of the peony 'DFG' in facility forcing cultivation in winter,and compared different light intensities of LED red and blue top light module of it.Index to provide light supplemental program and explore its mechanism through the photosynthetic rate,photosynthetic diurnal variation,photosynthetic characteristics,pigment,carbohydrate and soluble protein content.Research indicates:?1?The two lamps both significantly enhanced the growth and blooming quality of ' DFG',and the stem length,stem diameter,single flowering period,flower diameter under LED treatment were significantly better than those of the HPSL at the same light intensity.?2?The net photosynthetic rate of the LED treatment was significantly higher than that of IIPSL group in light filling period,this difference was limited by the stomatal factors.The diurnal variation of photosynthesis showed that the net photosynthetic rate of tow light filling treatments was higher than that of CK treatment.This is consistent with the results of the growth and flowering.?3?The effects of two light resources on the accumulation of pigments and photosynthetic products were inconsistency;The LED treatment significantly reduced carotenoids,chlorophyll a and chlorophyll b content,increased chlorophyll a/b;LED and HPSL treatment both increased the content of soluble protein and soluble sugar,and the accumulation trend of soluble sugar and starch was changed.The starch content of leaf under LED treatment was significantly lower than that of HPSL.?4?Three different light intensities LED,LH(200 ?mol·m-2·s-1),LM(150 ?mol·m-2·s-1),LL(100?mol·m-2·-1)all promoted the growth and flowering quality of'DFG' to a certain degree.The promotion effects of growth and flowering was more obvious under LH treatment and LM treatment on,while the LL treatment was less effective.?5?The net photosynthetic rate was positively correlated with the intensity of LED light,which was mainly limited by stomatal factors,and three LED treatments overall improved the net photosynthetic rate during the day,Which may be the main reason that the growth and flowring quality of LH treatment and LM treatment were superior to LL treatment and CK;?6?The leaf pigment content was negatively correlated with the light intensities of LED,but the chlorophyll a/b increased with the increase of light intensity.The different light intensities gradient changed the accumulation trend of soluble sugar,soluble protein and starch.The content of photosynthate in diiferent growing period was positively correlated with the light intensities,which was the physiological basis of.LED red and blue top light module with 150 ?mol·m-2·s-1 is more suitable for peony 'DFG' for facility forcing cultivation in winter from the production and energy saving point of view. |
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