Natural Sciences, Streatham Campus, University of Exeter, Exeter EX4 4PY, UK.
Fresh Produce Research Centre, Harper Adams University, Edgmond TF10 8JB, UK.
Molecules. 2022 May 18;27(10):3224. doi: 10.3390/molecules27103224.
Light quality has been reported to influence the phytochemical profile of broccoli sprouts/microgreens; however, few studies have researched the influence on mature broccoli. This is the first study to investigate how exposing a mature glasshouse grown vegetable brassica, Tenderstem® broccoli, to different light wavelengths before harvest influences the phytochemical content. Sixty broccoli plants were grown in a controlled environment glasshouse under ambient light until axial meristems reached >1 cm diameter, whereupon a third were placed under either green/red/far-red LED, blue LED, or remained in the original compartment. Primary and secondary spears were harvested after one and three weeks, respectively. Plant morphology, glucosinolate, carotenoid, tocopherol, and total polyphenol content were determined for each sample. Exposure to green/red/far-red light increased the total polyphenol content by up to 13% and maintained a comparable total glucosinolate content to the control. Blue light increased three of the four indole glucosinolates studied. The effect of light treatments on carotenoid and tocopherol content was inconclusive due to inconsistencies between trials, indicating that they are more sensitive to other environmental factors. These results have shown that by carefully selecting the wavelength, the nutritional content of mature broccoli prior to harvest could be manipulated according to demand.
已有研究报道，光质会影响西兰花芽/苗的植物化学物质组成，但目前鲜有研究关注成熟西兰花受光质的影响。本研究首次调查了在收获前用不同波长的光照射温室种植的成熟蔬菜 Brassica，Tenderstem®西兰花，对其植物化学物质含量的影响。60 株西兰花在温室环境下生长，接受自然光，直到轴向分生组织直径达到>1cm，然后将其中三分之一分别置于绿光/红光/远红光 LED、蓝光 LED 或保留在原始隔间中。分别在一周和三周后收获一级和二级嫩枝。对每个样本的植物形态、硫代葡萄糖苷、类胡萝卜素、生育酚和总多酚含量进行了测定。与对照组相比，绿光/红光/远红光照射可使总多酚含量增加高达 13%，同时保持总硫代葡萄糖苷含量相当。蓝光增加了研究的四种吲哚硫代葡萄糖苷中的三种。由于试验之间的不一致，光处理对类胡萝卜素和生育酚含量的影响尚无定论，表明它们对其他环境因素更为敏感。这些结果表明，通过仔细选择波长，可以根据需求在收获前对成熟西兰花的营养成分进行调控。
