不同光质对樱桃番茄幼苗生理与光合特性的影响

Effects of different light qualities on physiological and photosynthetic characteristics of cherry tomato seedlings

以樱桃番茄(Solanum lycopersicum var.cerasiforme)品种‘Micro Tom’为试材,利用LED精量调制光源,设白光、红/蓝光(1:1)、红/蓝光(3:1)、红/蓝光(5:1)、红/蓝光(7:1)五个处理,以白光为对照,测定樱桃番茄幼苗株高,茎粗,壮苗指数,根系活力,可溶性糖、可溶性蛋白、叶绿素含量,光合、荧光参数,叶片结构等,研究300μmol?m^(-2)?s^(-1)光强下不同光质处理对樱桃番茄幼苗形态,生理、光合、荧光特性及叶片结构的影响。结果表明:红/蓝(7:1)处理的比叶面积最大;红/蓝(3:1)处理的壮苗指数最高,最有利于壮苗的培育;红/蓝(3:1)处理的樱桃番茄幼苗可溶性糖、可溶性蛋白含量和根系活力均最高,并且与其他处理之间差异显著;红/蓝(1:1)处理的叶绿素含量最高;红/蓝(3:1)处理的净光合速率最高,红/蓝(1:1)最低;红/蓝(3:1)处理的光系统Ⅱ(PSⅡ)单位反应中心(RC)吸收、捕获、电子传递能量的能力最强,较对照差异极显著;红/蓝(3:1)处理的栅栏组织和海绵组织细胞长度最大。因此,红/蓝(3:1)处理最有利于壮苗培育,处理后樱桃番茄品质较高,光合、荧光特性较强,叶片厚度较大。

Taking ＇Micro Tom＇ cherry tomato （Solanum lycopersicum var. cerasiforme） as material, full white light, red/blue light （1：1）, red/blue light （3：1）, red/blue light （5：1）, red/blue light （7：1）, generated by light emit- ting diode （LED）, were applied to accurately modulate with white light as control. Plant height, stem diameter, health index, root activity, contents of soluble sugar, soluble protein and chlorophyll, and photosynthetic and fluorescence parameters of cherry tomato seedling were studied in five treatments. We investigated the effects of different light qualities under the same photosynthetic photon flux density （300μmol·m^-2·s^-1） on cherry toma- to seedling morphological, physiological and photosynthetic characteristics and the influence of the fluorescence properties. The results show that specific leaf area of red/blue light （7：1） is the maximal. The red/blue light （3：1） had the highest health index, and is the most suitable for cultivating strong seedling. The red/blue light （3：1） on cherry tomato seedling resulted in the highest contents of soluble sugar and soluble protein and root activity, and had significant difference with other treatments. The red/blue light （1：1） had the highest chlo- rophyll content. The red/blue light （3：1） had the highest net photosynthetic rate, and the red/blue light （1：1） had the lowest. ABS/RC, TRo/RC and ETo/RC were highest under red/blue light （3：1）, which was extremely signifi- cant difference compared to the control. Therefore, the red/blue light （3：1） treatment was more beneficial to the increase of photosynthetic and fluorescence characteristics and some qualities of cherry tomato seedlings.