Grafting: A possibility to enhance health-promoting and flavour compounds in tomato fruits of shaded plants?
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- 作者：Angelika Krumbein ; Krumbein@igzev.de ; Dietmar Schwarz
- 关键词：Radiation ; Sugars ; Acids ; Carotenoids ; Aroma volatiles ; Solanum lycopersicum
- 刊名：Scientia Horticulturae
- 出版年：2013
- 出版时间：4 January, 2013
- 年：2013
- 卷：149
- 期：Complete
- 页码：97-107
- 全文大小：390 K
文摘
The quality of tomato fruits may deteriorate under abiotic growing conditions, such as low radiation. The aim of this study was to investigate whether grafting two scions (¡®Piccolino¡¯, ¡®Classy¡¯) onto two commercial rootstocks (¡®Brigeor¡¯, ¡®Maxifort¡¯) was able to enhance carotenoids (lycopene, ¦Â-carotene) and flavour compounds (sugars, acids, aroma volatiles) in tomato fruits of shaded plants. Radiation reduced by 50 % due to shading decreased the fruit's concentrations of sugars (glucose, fructose) by up to 13 % and of ¦Â-carotene by up to 16 % in both scions due to decreased photosynthesis, which may further account for the decreased synthesis of volatiles. Interestingly, several volatiles such as (Z)-3-hexenal, 3-methylbutanol and 6-methyl-5-hepten-2-one increased following shading. Grafting onto ¡®Brigeor¡¯ decreased yield and fruit number independent of the scion. Photosynthesis of shaded tomato leaves as well as concentrations of fruit sugars was diminished by up to 12 % , latter independent of the rootstock. Furthermore, grafting ¡®Classy¡¯ onto ¡®Brigeor¡¯ decreased carotenoids by 8 % , resulting in a decrease of three carotenoid-derived volatiles (geranylacetone, ¦Â-cyclocitral and ¦Â-ionone). Titratable acids were increased by both shading (by 9 % ) and grafting (by 6 % ). In addition, lignin-derived volatiles such as methyl salicylate and guaiacol were enhanced by grafting both scions. However, grafting was unable to enhance the decreased fruit concentrations of sugars, ¦Â-carotene and five volatiles of shaded grown plants. Furthermore, the results of the experiments depended on the rootstock scion combination used.