Low and moderate photosynthetically active radiation affects the flavonol glycosides and hydroxycinnamic acid derivatives in kale (Brassica oleracea var. sabellica) dependent on two low temperatures

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• 作者：Susanne Neugart ; Michaela Fiol ; Monika Schreiner ; Sascha Rohn ; Rita Zrenner ; Lothar W. Kroh ; Angelika Krumbein
• 关键词：Brassica oleracea ; Flavonoids ; Quercetin glycosides ; Kaempferol glycosides ; Hydroxycinnamic acids ; Photosynthetic active radiation ; Temperature
• 刊名：Plant Physiology and Biochemistry
• 出版年：November, 2013
• 年：2013
• 卷：72
• 期：Complete
• 页码：161-168
• 全文大小：271 K

文摘

Kale (Brassica oleracea var. sabellica) contains a large number of naturally occurring structurally different non-acylated and acylated flavonol glycosides as well as hydroxycinnamic acid derivatives. The objective of this study was to determine the effect of low and moderate photosynthetic active radiation (PAR) and how these levels interact with low temperature in these phenolic compounds. Juvenile kale plants were treated with PAR levels from 200 to 800聽渭mol聽m^鈭?聽s^鈭? at 5 and 10聽掳C under defined conditions in climate chambers. Of the investigated 20 compounds, 11 and 17 compounds were influenced by PAR and temperature, respectively. In addition, an interaction between PAR and temperature was found for eight compounds. The response of the phenolic compounds to PAR was structure-dependent. While quercetin triglycosides increased with higher PAR at 5 and 10聽掳C, the kaempferol triglycosides exhibited the highest concentrations at 400聽渭mol聽m^鈭?聽s^鈭?. In contrast, kaempferol diglycosides exhibited the highest concentrations at increased PAR levels of 600 and 800聽渭mol聽m^鈭?聽s^鈭? at 10聽掳C. However, key genes of flavonol biosynthesis were influenced by temperature but remained unaffected by PAR. Furthermore, there was no interaction between the PAR level and the low temperature in the response of hydroxycinnamic acid derivatives in kale with the exception of caffeoylquinic acid, which decreased with higher PAR levels of 600 and 800聽渭mol聽m^鈭?聽s^鈭? and at a lower temperature. In conclusion, PAR and its interaction with temperature could be a suitable tool for modifying the profile of phenolic compounds.