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큐어링 후 저장에 따른 고구마 저장뿌리 단백질체의 비교분석

Comparative proteome profiling in the storage root of sweet potato during curing-mediated wound healing

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Sweet potato (Ipomoea batatas L. Lam) is an economically important root crop and a valuable source of nutrients, processed foods, animal feeds, and pigment materials. However, during post-harvest storage, storage roots of sweet potatoes are susceptible to decay caused by various microorganisms and diseases. Post-harvest curing is the most effective means of healing wounds and preventing spoilage by microorganisms during storage. In this study, we aimed to identify proteins involved in the molecular mechanisms related to curing and study proteomic changes during the post-curing storage period. For this purpose, changes in protein spots were analyzed through 2D-electro- phoresis after treatment at 33°C (curing) and 15°C (control) for three days, followed by a storage period of eight weeks. As a result, we observed 31 differentially expressed protein spots between curing and control groups, among which 15 were identified. Among the identified proteins, the expression level of ‘alpha-amylase (spot 1)’ increased only after the curing treatment, whereas the expression levels of ‘probable aldo-keto reductase 2-like (spot 3)’ and ‘hypothetical protein CHGG_01724 (spot 4)’ increased in both the curing and control groups. However, the expression level of ‘sporamin A (spot 10)’ decreased in both the curing and control treatments. In the control treatment, the expression level of ‘enolase (spot 14)’ increased, but the expression levels of ‘chain A of actinidin-E-64 complex+ (spot 19)’, ‘ascorbate peroxidase (spot 22)’, and several ‘sporamin proteins (spot 20, 21, 23, 24, 27, 29, 30, and 31)’ decreased. These results are expected to help identify proteins related to the curing process in sweet potato storage roots, understand the mechanisms related to disease resistance during post-harvest storage, and derive candidate genes to develop new varieties with improved low-temperature storage capabilities in the future.

Abstract

Sweet potato (Ipomoea batatas L. Lam) is an economically important root crop and a valuable source of nutrients, processed foods, animal feeds, and pigment materials. However, during post-harvest storage, storage roots of sweet potatoes are susceptible to decay caused by various microorganisms and diseases. Post-harvest curing is the most effective means of healing wounds and preventing spoilage by microorganisms during storage. In this study, we aimed to identify proteins involved in the molecular mechanisms related to curing and study proteomic changes during the post-curing storage period. For this purpose, changes in protein spots were analyzed through 2D-electro- phoresis after treatment at 33°C (curing) and 15°C (control) for three days, followed by a storage period of eight weeks. As a result, we observed 31 differentially expressed protein spots between curing and control groups, among which 15 were identified. Among the identified proteins, the expression level of ‘alpha-amylase (spot 1)’ increased only after the curing treatment, whereas the expression levels of ‘probable aldo-keto reductase 2-like (spot 3)’ and ‘hypothetical protein CHGG_01724 (spot 4)’ increased in both the curing and control groups. However, the expression level of ‘sporamin A (spot 10)’ decreased in both the curing and control treatments. In the control treatment, the expression level of ‘enolase (spot 14)’ increased, but the expression levels of ‘chain A of actinidin-E-64 complex+ (spot 19)’, ‘ascorbate peroxidase (spot 22)’, and several ‘sporamin proteins (spot 20, 21, 23, 24, 27, 29, 30, and 31)’ decreased. These results are expected to help identify proteins related to the curing process in sweet potato storage roots, understand the mechanisms related to disease resistance during post-harvest storage, and derive candidate genes to develop new varieties with improved low-temperature storage capabilities in the future.

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