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Sequential light programs shape kale (Brassica napus) sprout appearance and alter metabolic and nutrient content.

Carvalho SD, Folta KM - Hortic Res (2014)

Bottom Line: Different light wavelengths have specific effects on plant growth and development.Sequential treatments of darkness, blue light, red light and far-red light were applied throughout sprout development to alter final product quality.These results indicate that sequential treatment with narrow-bandwidth light may be used to affect key economically important traits in high-value crops.

View Article: PubMed Central - PubMed

Affiliation: Horticultural Sciences Department, University of Florida , Gainesville, FL, USA ; Plant Molecular and Cellular Biology Program, University of Florida , Gainesville, FL, USA.

ABSTRACT
Different light wavelengths have specific effects on plant growth and development. Narrow-bandwidth light-emitting diode (LED) lighting may be used to directionally manipulate size, color and metabolites in high-value fruits and vegetables. In this report, Red Russian kale (Brassica napus) seedlings were grown under specific light conditions and analyzed for photomorphogenic responses, pigment accumulation and nutraceutical content. The results showed that this genotype responds predictably to darkness, blue and red light, with suppression of hypocotyl elongation, development of pigments and changes in specific metabolites. However, these seedlings were relatively hypersensitive to far-red light, leading to uncharacteristically short hypocotyls and high pigment accumulation, even after growth under very low fluence rates (<1 μmol m(-2) s(-1)). General antioxidant levels and aliphatic glucosinolates are elevated by far-red light treatments. Sequential treatments of darkness, blue light, red light and far-red light were applied throughout sprout development to alter final product quality. These results indicate that sequential treatment with narrow-bandwidth light may be used to affect key economically important traits in high-value crops.

No MeSH data available.


Related in: MedlinePlus

Hypocotyl elongation of Red Russian kale seedlings under selective light conditions. (a) Hypocotyl length after 4 days of exposure to white, far-red, red or blue light with the indicated fluence rates; (b) after 1 day of darkness and 3 d of light; (c) 2 days of darkness and 2 days of light; (d) 3 days of darkness and 1 day of light. (e) Hypocotyl elongation during 4 days of exposure to 0 (closed circles) or 10 µmol m−2 s−1 of white (opened circles), far-red (grey circles), red (closed triangles) or blue (opened triangles) light. Results are representative of three independent experiments. Means±s.e., n=18. s.e., standard error.
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fig2: Hypocotyl elongation of Red Russian kale seedlings under selective light conditions. (a) Hypocotyl length after 4 days of exposure to white, far-red, red or blue light with the indicated fluence rates; (b) after 1 day of darkness and 3 d of light; (c) 2 days of darkness and 2 days of light; (d) 3 days of darkness and 1 day of light. (e) Hypocotyl elongation during 4 days of exposure to 0 (closed circles) or 10 µmol m−2 s−1 of white (opened circles), far-red (grey circles), red (closed triangles) or blue (opened triangles) light. Results are representative of three independent experiments. Means±s.e., n=18. s.e., standard error.

Mentions: Red Russian kale seedling development was first assessed under different light conditions and a variety of fluence rates. Seedlings were allowed to germinate in darkness and then were moved to various wavelengths and three fluence rates, at 24-h intervals (light/dark; 0 D/96 L, 24 D/72 L, 48 D/48 L and 72 D/24 L). Figure 1 shows the typical seedling response to light with expanded cotyledons and greening and also the repression of hypocotyl elongation. The effect of light on hypocotyl elongation was quantified in Figure 2a–2d. White, blue and red light all have comparable effects on the kale responses over the duration of the experiment, leading to stronger stem growth inhibition under higher fluence rates. Far-red light, however, exerts a different effect and promotes the most robust repression, almost independently of the fluence rate, of stem growth rate (Figure 2a–2d), with seedlings approximately 10% the length of dark-grown controls, even at 1 μmol m−2 s−1 after 0 D/96 L treatment (Figure 2a).


Sequential light programs shape kale (Brassica napus) sprout appearance and alter metabolic and nutrient content.

Carvalho SD, Folta KM - Hortic Res (2014)

Hypocotyl elongation of Red Russian kale seedlings under selective light conditions. (a) Hypocotyl length after 4 days of exposure to white, far-red, red or blue light with the indicated fluence rates; (b) after 1 day of darkness and 3 d of light; (c) 2 days of darkness and 2 days of light; (d) 3 days of darkness and 1 day of light. (e) Hypocotyl elongation during 4 days of exposure to 0 (closed circles) or 10 µmol m−2 s−1 of white (opened circles), far-red (grey circles), red (closed triangles) or blue (opened triangles) light. Results are representative of three independent experiments. Means±s.e., n=18. s.e., standard error.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4591675&req=5

fig2: Hypocotyl elongation of Red Russian kale seedlings under selective light conditions. (a) Hypocotyl length after 4 days of exposure to white, far-red, red or blue light with the indicated fluence rates; (b) after 1 day of darkness and 3 d of light; (c) 2 days of darkness and 2 days of light; (d) 3 days of darkness and 1 day of light. (e) Hypocotyl elongation during 4 days of exposure to 0 (closed circles) or 10 µmol m−2 s−1 of white (opened circles), far-red (grey circles), red (closed triangles) or blue (opened triangles) light. Results are representative of three independent experiments. Means±s.e., n=18. s.e., standard error.
Mentions: Red Russian kale seedling development was first assessed under different light conditions and a variety of fluence rates. Seedlings were allowed to germinate in darkness and then were moved to various wavelengths and three fluence rates, at 24-h intervals (light/dark; 0 D/96 L, 24 D/72 L, 48 D/48 L and 72 D/24 L). Figure 1 shows the typical seedling response to light with expanded cotyledons and greening and also the repression of hypocotyl elongation. The effect of light on hypocotyl elongation was quantified in Figure 2a–2d. White, blue and red light all have comparable effects on the kale responses over the duration of the experiment, leading to stronger stem growth inhibition under higher fluence rates. Far-red light, however, exerts a different effect and promotes the most robust repression, almost independently of the fluence rate, of stem growth rate (Figure 2a–2d), with seedlings approximately 10% the length of dark-grown controls, even at 1 μmol m−2 s−1 after 0 D/96 L treatment (Figure 2a).

Bottom Line: Different light wavelengths have specific effects on plant growth and development.Sequential treatments of darkness, blue light, red light and far-red light were applied throughout sprout development to alter final product quality.These results indicate that sequential treatment with narrow-bandwidth light may be used to affect key economically important traits in high-value crops.

View Article: PubMed Central - PubMed

Affiliation: Horticultural Sciences Department, University of Florida , Gainesville, FL, USA ; Plant Molecular and Cellular Biology Program, University of Florida , Gainesville, FL, USA.

ABSTRACT
Different light wavelengths have specific effects on plant growth and development. Narrow-bandwidth light-emitting diode (LED) lighting may be used to directionally manipulate size, color and metabolites in high-value fruits and vegetables. In this report, Red Russian kale (Brassica napus) seedlings were grown under specific light conditions and analyzed for photomorphogenic responses, pigment accumulation and nutraceutical content. The results showed that this genotype responds predictably to darkness, blue and red light, with suppression of hypocotyl elongation, development of pigments and changes in specific metabolites. However, these seedlings were relatively hypersensitive to far-red light, leading to uncharacteristically short hypocotyls and high pigment accumulation, even after growth under very low fluence rates (<1 μmol m(-2) s(-1)). General antioxidant levels and aliphatic glucosinolates are elevated by far-red light treatments. Sequential treatments of darkness, blue light, red light and far-red light were applied throughout sprout development to alter final product quality. These results indicate that sequential treatment with narrow-bandwidth light may be used to affect key economically important traits in high-value crops.

No MeSH data available.


Related in: MedlinePlus