光强对金荞麦幼苗部分生理指标和生物量的影响

Effects of Light Intensity on Biomass and Physiological Indexes of Fagopyrum dibotrys

研究不同光强对金荞麦幼苗生物量和部分生理指标的影响.采用室外盆栽试验方法,用遮阳网形成的不同光强处理金荞麦幼苗75d后测定其生物量;另外分5个时期(处理后15d、30d、45d、60d、75d)测定生理指标.50.32%光强下生长的金荞麦幼苗生物量显著高于其他处理.弱光(20.85%和6.98%光强)下生长的金荞麦幼苗在生物量积累减少的情况下,通过增加叶、根生物量和叶柄生物量配置比例,减少主茎、分枝茎生物量配置来适应光环境.金荞麦幼苗叶绿素a、b及叶绿素总质量分数、可溶性蛋白质量分数、脯氨酸质量分数随着光强减弱而增加,可溶性糖质量分数则相反,其中叶绿素a、b质量分数和脯氨酸质量分数在4个不同处理中达到显著性水平.对于人工栽培的金荞麦,在幼苗期应适当遮阴(试验的相对光强为50%左右),更有利于其生长.

In an extraventricular pot experiment,Fagopyrum dibotry seedlings were planted under various light intensities,and their biomass was determined after 75 d and their physiological indexes were determined after15 d,30 d,45 d,60 d and 75 d.Biomass per plant was significantly higher in the treatment of 50.32% sunshine than in other treatments.In weak light treatments（20.85 and 6.98% sunshine）,biomass accumulation decreased,and the seedlings allotted more biomass to the leaf,root and petiole and less biomass to the main stem and branches to adapt to the weak light environment.With the decrease in light intensity,contents of chlorophyll a,chlorophyll b,chlorophyll a＋b,soluble protein and proline of the seedlings increased and chlorophyll a/b and soluble sugar content decreased.In the 4 different treatments,the effects of light intensity on chlorophyll and proline were significant statistically.In cultivation of F.dibotrys,proper shading at the seedling stage with a relative light intensity of 50% will be beneficial to the growth of the plants.