摘要： 在温室条件下,采用水培盆栽的方法研究了红色、紫色和绿色3种叶色的生菜光合色素的光吸收特性以及生长和营养品质差异。结果表明,3种叶色生菜光合色素对光的选择性吸收规律基本相同,均在330~380nm的紫外光区、380~500nm的蓝光区和640~690nm的红光区有较大吸光度,且对紫外光的吸收最为强烈;绿叶生菜在光吸收峰值波长处的吸光度显著低于红叶生菜和紫叶生菜;红叶生菜光合色素在波长为380nm可见光处出现一光吸收峰值。红叶生菜和紫叶生菜各光合色素含量均显著高于绿叶生菜,但各光合色素所占总光合色素比例不存在显著差异,且地上部鲜质量和根鲜质量没有显著性差异;3种叶色生菜总酚、类黄酮、可溶性糖、抗坏血酸含量均无显著性差异;花青素含量存在显著差异,为红叶生菜>紫叶生菜>绿叶生菜。

关键词: 生菜, 光谱吸收, 营养品质, 叶色, 品种

Abstract: Lettuces of red, purple and green leaves were planted with hydroponics, and the spectral absorbance and nutritional quality of the lettuces were studied. The results showed the curves of the photosynthetic pigments absorbing spectrum for three leaf-color lettuce cultivars were the same. Spectral absorbance of the three kinds of lettuces were higher at 330一380 nm,380一500 nm and 640一690 nm,among which the absorbance at 330一380 nm was the highest. Spectral absorbance of green leaves lettuce at high absorbed spectrums were remarkably lower than that of red and purple lettuce. And the red lettuce had a spectral absorbance peak at 380 nm. All kinds of photosynthetic pigments of red lettuce and purple lettuce were significantly higher than green lettuce. However there was no significant difference on biomass yield. The differences of the concentrations of phenol, flavonoid,rouble surgar,ascorbic acid between three kinds of lettuces were unremarkable,but the concentrations of anthocyanin differed great1y , as the sequence of red lettuce>purple lettuce>green lettuce.

Key words: Lettuce, Spectral absorbance, Nutritional quality, Leaf color, Cultivar

中图分类号: 

• S636.01