Bagging Treatment Influences Production of C6 Aldehydes and Biosynthesis-Related Gene Expression in Peach Fruit Skin

Abstract

Abstract:Bagging is a useful method to improve fruit quality by altering its exposure to light, whereas its effect on fruit volatiles production is inconsistent, and the genes responsible for the observed changes remain unknown. In the present study, single-layer yellow paper bags were used to study the effects of bagging treatment on the formation of C 6 aldehydes in peach fruit (Prunus persica L. Batsch, cv. Yulu) over two succeeding seasons. Higher concentrations of n-hexanal and (E)-2-hexenal, which are characteristic aroma volatiles of peach fruit, were induced by bagging treatment. After bagging treatment, peach fruit had significantly higher LOX and HPL enzyme activities, accompanying increased contents of C 6 aldehydes. The gene expression data obtained through real-time PCR showed that no consistent significant differences in transcript levels of LOX genes were observed over the two seasons, but significantly up-regulated expression was found for PpHPL1 after bagging treatment In addition, bagging-treated fruit produced more (E)-2-hexenal and had higher expression levels of PpHPL1 during postharvest ripening at room temperature. The regulatory role of the LOX-HPL pathway OPEN ACCESSMolecules 2014, 19 13462 on the biosynthesis of n-hexanal and (E)-2-hexenal in response to bagging treatment during peach fruit development is discussed in the text.

UV‐B irradiation differentially regulates terpene synthases and terpene content of peach

“…Similar observations were also made in tomato, in which a supplemental UV-B irradiation pre-harvest treatment inhibited the production of volatiles that contribute to high aroma, reducing overall consumer approval scores (Dzakovich et al 2016). The use of fruit bagging as a management tool in agricultural practice affects the production of volatiles (Jia et al 2005;Wang et al 2010;Shen et al 2014), and we investigated whether this could be caused by alterations in UV-B exposure of fruits using different bag materials.…”

“…; Shen et al . ), and we investigated whether this could be caused by alterations in UV‐B exposure of fruits using different bag materials.…”

“…Light of different wavelengths from UV-B to far red can penetrate various bag materials used for cultivation to different extents . Significant differences in volatiles were reported for peach fruits covered with bags (Jia et al 2005;Wang et al 2010;Shen et al 2014), indicating a potential regulatory role of UV-B radiation in volatile formation.…”

Phytohormone Interaction Modulating Fruit Responses to Photooxidative and Heat Stress on Apple (Malus domestica Borkh.)

“…In fact, ET and auxin crosstalk in Arabidopsis have been positively correlated with flavonol biosynthesis and accumulation (quercetin and kaempferol) ( Lewis et al, 2011 ), a known photoprotective mechanism in sun exposed apple fruit ( Racsko and Schrader, 2012 ), as well as in other fruit crops ( Mahouachi et al, 2014 ). In particular, the accumulation of quercetin glycosides have been directly correlated with sun damage severity ( Felicetti and Schrader, 2010 ; Yuri et al, 2010 ; Hernandez et al, 2014 ; Torres et al, 2016 ).…”

Pre-harvest field application of enhanced freshness formulation reduces yield loss in orange

“…Orange trees bear many fruits but most of them drop at early stages of development or before attaining the commercial ripening stage [9,10]. Several techniques have been reported to reduce fruit drop and increase retention of fruit on orange trees [11][12][13][14][15][16]. For example, an aldehyde (n-hexanal and (E)-2-hexanal) improves fruit retention on trees and fruit quality such as aroma, skin colour, and firmness [17,18].…”