Analysis of Photosynthetic Characteristics and UV-B Absorbing Compounds in Mung Bean Using UV-B and Red LED Radiation.

Fang-Min Li,Zhi-Guo Lu,Ming Yue

doi:10.1155/2014/378242

Abstract

Mung bean has been reported to have antioxidant, antidiabetic, anti-inflammatory, and antitumor activities. Various factors have important effects on the types and contents of plant chemical components. In order to study quality of mung bean from different light sources, mung bean seedlings were exposed to red light-emitting diodes (LEDs) and ultraviolet-B (UV-B). Changes in the growth parameters, photosynthetic characteristics, the concentrations of chlorophyll a and chlorophyll b and the content of UV-B absorbing compounds were measured. The results showed that photosynthetic characteristics and chlorophyll a and chlorophyll b concentrations were enhanced by red LEDs. The concentrations of UV-B absorbing compounds were enhanced by UV-B on the 20th day, while photosynthetic characteristics, plant length, and the concentrations of chlorophyll a and chlorophyll b were reduced by UV-B on the 40th day; at the same time the values of the stem diameter, plant fresh weight, dry weight, and the concentrations of UV-B absorbing compounds were enhanced. It is suggested that red LEDs promote the elongation of plant root growth and photosynthetic characteristics, while UV-B promotes horizontal growth of stems and the synthesis of UV-B absorbing compounds.

Highlights

Mung bean (Phaseolus radiatus L.) is a leguminous species grown in different parts of the world, primarily especially in Asia including China, India, Burma, and Thailand
It was observed that the values of the growth parameters of mung bean seedlings were irradiated for 20th day by red light-emitting diodes (LEDs) and UV-B was not significantly different compared with that of the ordinary fluorescent light (Table 2)
We used red LED and UV-B as supplementary light sources for the ordinary fluorescent light to study the role of these light sources in plant cultivation

Summary

Introduction

Mung bean (Phaseolus radiatus L.) is a leguminous species grown in different parts of the world, primarily especially in Asia including China, India, Burma, and Thailand. Mung bean has been reported to possess antioxidant, antidiabetic, antiinflammatory, antitumor and antimelanocytes, and antiangiotensin I-converting enzyme activities [2,3,4,5,6,7,8]. Mung bean contains free phenolic acids, bound phenolic acids, total phenolic, and anthocyanin. Other reports showed that flavonoids including vitexin and isovitexin were the dominant components in mung bean [2, 9] and the content of vitexin was much higher than that of isovitexin in ethanol extracts [10]. It has been reported that mung bean has a strong antioxidant activity and isovitexin and vitexin contribute to most of the 1,1-diphenyl-2-picrylhydrazyl, ferric-reducing antioxidant power or 2,2󸀠-azinobis-(3-ethylbenzthiazoline-6sulphonate) radical scavenging ability [2]

Methods

Results

Conclusion