光质对紫背天葵生长、次生代谢和抗氧化胁迫的影响

以紫背天葵为供试材料,采用LED灯精量调控光质和光强,研究相同光照强度(350±5 μmol·m^-2·s^-1)下,白光(W)、红光(R)、蓝光(B)、黄光(Y)、红蓝混合光(RB)、红蓝黄混合光(RBY)对紫背天葵生长、次生代谢和氧化胁迫抗性的影响.结果表明:与白光(W)相比,红光(R)能够显著促进紫背天葵植株的生长以及干物质和可溶性糖含量的积累;而蓝光(B)则抑制紫背天葵的生长;叶绿素含量在有色光处理下均显著降低;虽然红蓝黄混合光(RBY)未能显著提升紫背天葵的干物质含量,但总酚、类黄酮和花青素含量显著提升,这些还原态物质的积累有利于提高紫背天葵的抗氧化能力,在增强自身抗逆性的同时提升营养价值.本研究为光质调控紫背天葵的多样化生产提供了理论依据.

Effects of light quality on growth,secondary metabolites,and oxidative stress tolerance of Gynura bicolor.

The effects of white light, red light, blue light, yellow light, red+blue light and red+blue+yellow light on the growth and quality of Gynura bicolor were investigated under the same light intensity (350±5 μmol·m^-2·s^-1) by using light-emitting-diodes (LEDs) which could accurately regulate light quality and light intensity. The results indicated that compared with white light, red light could significantly promote the growth of G. bicolor and induce the accumulation of dry substance and soluble sugar content, but blue light inhibited the plant growth. The content of chlorophyll significantly decreased under the colored LEDs. Although the combination of red, blue and yellow light did not increase the dry substance accumulation, it resulted in significant elevation of total phenols, flavonoids and anthocyanins. The accumulation of these reduced substances could increase the tolerance to oxidative stress and the nutrient value in G. bicolor. This study provided a theoretical basis for G. bicolor diverse production regulated by light quality.