The lettuces of red, purple and green leaves were planted with hydroponics, and the influences of UV radiation on the spectral absorbance, growth and nutritional quality of the lettuces were studied. The results showed that for the three leaf-color lettuce cultivars under UV radiation and blank control, the photosynthetic pigments spectral absorbance values were high and changed drastically in the spectrum of 330-500 nm and 640-690 nm, and were low and changed smoothly in the spectrum of 500-640 nm and 690-800 nm. For the contents of chlorophylla and total photosynthetic pigment, the green lettuce under UV radiation was not remarkably different from the reference, in contrast, the red lettuce increased significantly, but the purple lettuce increased notably only under UV-B radiation. The treatment of UV radiation significantly decreased the shoot fresh weight of the green lettuce, while remarkably reduced that of the purple lettuce, but didn't make that of the red lettuce notably different. The shoot dry weights of the three leaf-color lettuces were lowered greatly under UV radiation. The concentration of phenol for the green lettuce lessened distinctly under UV radiation, but it didn't differ greatly for the purple lettuce. The concentration of phenol for the red lettuce increased remarkably only under UV-B. The treatment of UV radiation significantly reduced the concentration of flavonoid for the green lettuce, but didn't change those of the red and purple lettuces greatly. However, the treatment didn't change the concentration of anthocyanin for the green lettuce, but enhanced those of the red and purple lettuces greatly. The concentration of soluble sugar for the green lettuce increased notably under UV radiation, and that of the red lettuce was the contrary. But the concentration of soluble sugar for the purple lettuce enhanced greatly only under UV-A radiation.
LIU Wenke
,
YU Yi
,
ZHAO Jiaojiao
,
YANG Qichang
. Influences of UV Radiation on Growth and Nutritional Quality of Three Leaf-color Lettuce Cultivars[J]. Science & Technology Review, 2014
, 32(10)
: 36
-40
.
DOI: 10.3981/j.issn.1000-7857.2014.10.006
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