Articles
Effects of far-red and UV-A lighting on phytochemicals and antioxidant activity in late growth stage of coriander (Coriandrum sativum L.)
Article number
1423_31
Pages
235 – 242
Language
English
Abstract
This study aims to investigate the effects of supplemental far-red (FR; 710-740 nm) and UV-A (360-370 nm) lighting in the late growth stages (42-45 days after sowing) of coriander (Coriandrum sativum L.) when combined with 20% red (660 nm) and 80% white lighting (RW) at 200 μmol m‑2 s‑1 with a 16-h photoperiod.
Coriander grown under RW light alone for the first 7-41 days produced 16.18 and 8.53 g average fresh shoot and root weights, respectively.
The average height was 27.3 cm with 8.3 leaves and 5.3 branches.
Introducing supplemental FR increased shoot and root fresh weights to 20.00 g and 9.34 g, respectively.
Plant height also increased to 29.8 cm, while number of leaves and branches decreased slightly to 7.8 and 5.4, respectively.
In contrast, supplemental UV-A light produced greater increase in shoot fresh weight (32.53 g), height (35.5 cm), number of leaves (11.2) and branches (5.5) compared to FR supplementation.
Total phenolic compounds (TPC), total flavonoids (TF), total anthocyanins (ACN), and antioxidant activities (AA) measured by ferric reducing antioxidant power (FRAP), oxygen radical absorbance capacity (ORAC), and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, were also determined in coriander leaves and roots.
TPC, TF, ACN and AA (FRAP and ORAC) significantly increased in leaves that were exposed to FR, while lesser effect was found in roots.
In contrast, most tests in both leaves and roots remained unchanged after supplement of UV-A, except ACN and ORAC in leaves, TF and ORAC in roots that were reduced, and IC50 value of DPPH assay in the root were higher.
In conclusion, supplemental FR lighting potentially increases secondary metabolite production and antioxidant activity when applied late in the coriander growth cycle in addition to RW lighting.
Whereas UV-A seems to have no effect or negative effect on the phenolic compounds and their antioxidant activity.
Coriander grown under RW light alone for the first 7-41 days produced 16.18 and 8.53 g average fresh shoot and root weights, respectively.
The average height was 27.3 cm with 8.3 leaves and 5.3 branches.
Introducing supplemental FR increased shoot and root fresh weights to 20.00 g and 9.34 g, respectively.
Plant height also increased to 29.8 cm, while number of leaves and branches decreased slightly to 7.8 and 5.4, respectively.
In contrast, supplemental UV-A light produced greater increase in shoot fresh weight (32.53 g), height (35.5 cm), number of leaves (11.2) and branches (5.5) compared to FR supplementation.
Total phenolic compounds (TPC), total flavonoids (TF), total anthocyanins (ACN), and antioxidant activities (AA) measured by ferric reducing antioxidant power (FRAP), oxygen radical absorbance capacity (ORAC), and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, were also determined in coriander leaves and roots.
TPC, TF, ACN and AA (FRAP and ORAC) significantly increased in leaves that were exposed to FR, while lesser effect was found in roots.
In contrast, most tests in both leaves and roots remained unchanged after supplement of UV-A, except ACN and ORAC in leaves, TF and ORAC in roots that were reduced, and IC50 value of DPPH assay in the root were higher.
In conclusion, supplemental FR lighting potentially increases secondary metabolite production and antioxidant activity when applied late in the coriander growth cycle in addition to RW lighting.
Whereas UV-A seems to have no effect or negative effect on the phenolic compounds and their antioxidant activity.
Authors
P. Somsong, T. Weeplian, S. Kiravittaya, T. Tayjasanant
Keywords
artificial lighting, coriander, phytochemicals, antioxidant activity
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