Effect Of Light Qualities On The Photosynthetic Characteristics And Qualities Of Strawberry

Under different light conditions,the effect of different light qualities on the photosynthetic characters and qualities of strawberry were studied.The main results were as following:1 The net photosynthetic rate(Pn),intercellularCO₂ concentration and transpiration rate also were strongly affected by light quality.The photosynthetic rate Pn of strawberry leaves under green film was significantly lower than that of all other film treatmen.Pn value was highest,then was yellow light,The lowed content in the fruits under different film was correlated with the lower light under different film.The intercellular CO₂ concentration and determined under different light films in the order:red film＞yellow film and neutral film＞green film＞blue film.2 Studies on the photosynthetic characteristics of strawberry leaves under identical light intensity(55～57%natural light)and different light quality showed:maximal photochemical efficiency of(Fv/Fm)and Fm/Fo were correlated with red/blue ratios positively.The order:red film＞neutral film＞yellow film＞green blue＞blue film.3 The influence of different light quality on plant growth and fruiting of 'Toyonoka' strawberry were studied.The soluble solids(SSC),titratable acids,SSC and TA,sugar and organic acid acid compounds was influenced by light quality.Ascorbic acid (AsA)content in the fruits under different films was correlated with Red/Blue ratio negativcly.TheSSA,AsA and sugar content werethe greatest under blue film,but all of which were the lowest under green film.4 Light quality could influence the nitrogen metabolism of plant,and adjust the free amino acids and protein metabolism,the content of protein was high under blue light treatment.Blue light could significantly increase the the contents of protein and free amino acids of the strawberry fuites,and the contents of protein and free amino acids were decreased of developing fuits.5 Light quality could influence the anthocyanin,phenolic-compounds and flavonoids content determined under different light films in the order:yellow film＞green film and white film＞blue film＞red film;phenolic content:blue film＞green film＞yellow film＞white film＞red film,which were correlated with red/far-red(R/FR)ratios negatively.The flavonoid content changed resembled to those of phenolic-compounds.