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. 2016 Aug;53(8):3166-3174.
doi: 10.1007/s13197-016-2290-0. Epub 2016 Jul 26.

Ethylene inhibited sprouting of potato tubers by influencing the carbohydrate metabolism pathway

Hongfei Dai  1 , Maorun Fu  1 , Xiaoying Yang  1 , Qingmin Chen  2
Affiliations

Ethylene inhibited sprouting of potato tubers by influencing the carbohydrate metabolism pathway

Hongfei Dai et al. J Food Sci Technol. 2016 Aug.

Abstract

The aim of this study was to investigate the role of ethylene to control sprouting of potatoes by observing the effect of exogenous ethylene on carbohydrate metabolism and key enzymes. The initial time of potato tuber sprouting and sprouting index were recorded, and rate of respiration, total sugar, total reducing sugar, starch, fructose, glucose, sucrose and the activities of acid invertase (AI), neutral invertase (NI), sucrose synthase (SS), sucrose phosphate synthase (SPS), starch phosphorylase and amylase during sprouting were measured. Exogenous ethylene inhibited sprouting of potato tubers. Moreover, exogenous ethylene increased respiration total sugar, AI activity, SPS activity, SS activity, and reduced sugar and assay activity. Nevertheless, starch, glucose, fructose, NI activity and starch phosphorylase activity showed lower variation. Lower sprouting resulted into potatoes with higher levels of total sugar, total reducing sugar and glucose, and lower level of fructose and sucrose. And sprouting could be inhibited by increasing the activities of SS, SPS and AI by treatment with 199.3 μl L-1 exogenous ethylene. Overall, exogenous ethylene inhibited sprouting of potato tubers by influencing its carbohydrate metabolism.

Keywords: Carbohydrate metabolism; Exogenous ethylene; Key enzymes; Potato tuber; Sprouting.

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Figures

Fig. 1
Fig. 1
Sprouting indexes of potato tubers. Each value represents mean ± standard deviation of three replicates
Fig. 2
Fig. 2
Respiration rate of potato tubers. Each value represents mean ± standard deviation of three replicates
Fig. 3
Fig. 3
Total sugar (a), total reducing sugar (b), starch (c) content of potato tubers. Each value represents mean ± standard deviation of three replicates
Fig. 4
Fig. 4
Glucose (a), fructose (b) and sucrose (c) content of potato tubers. Each value represents mean ± standard deviation of three replicates
Fig. 5
Fig. 5
Carbohydrate metabolism-related enzyme activities. Each value represents mean ± standard deviation of three replicates. a acid invertase (AI), b neutral invertase (NI), c invertase, d sucrose synthase (SS), e sucrose phosphate synthase (SPS), f starch phosphorylase, g amylase
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