Effect of Light Emitting Diode (LED) on the Growth and Photosynthetic Characteristics of Brassica Juncea

Abstract

Light is fundamental precursor for plant growth and development. LED provides a uniform source of light for closed plant farming practices. The present study was carried out to investigate the effect of various wavelength light-emitting diodes (LEDs) on photosynthetic parameters of Brassica juncea. Under red light treatment, number of leaves, fresh and dry mass of roots and shoots was increased. While under blue light, stem length was longer than other lights. In combination of both lights, root length, area of leaves was greater as compared to others. Moisture content was more in plant growing under red light. The contents of chlorophyll a were higher under blue LEDs light while chlorophyll b concentration was higher under red. However, the plants grown under blue and red light exhibited closed stomata and fewer in number. The concentration of total soluble protein and soluble sugar were found highest under blue LEDs. From these results, we can conclude that red light is most significant for biomass production and chlorophyll b contents while blue light is preferable for soluble proteins and sugar concentration and chlorophyll a.