期刊
POSTHARVEST BIOLOGY AND TECHNOLOGY
卷 140, 期 -, 页码 42-49出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.postharvbio.2018.02.007
关键词
Calcium; Melatonin; Postharvest physiological deterioration; Cassava
资金
- National Natural Science Foundation of P. R. China [31771859, 31500981, 31760067]
- Key Research and Development Project of Hainan Province [ZDYF2018220]
- Natural Science Foundation of Hainan Province [317255]
- Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences [1630052016005, 1630052016006, 1630052017021]
- Central Public-interest Scientific Institution Basal Research Fund for Innovative Research Team Program of CATAS [17CXTD-28, 1630052017017]
- earmarked fund for Modern Agro-industry Technology Research System [CARS-11]
Rapid postharvest physiological deterioration largely reduces the quality and marketability of cassava. The molecular mechanism underlying cassava postharvest physiological deterioration and quality loss is largely unknown. The present study aimed to investigate the role of calcium and its relationship with melatonin in cassava postharvest physiological deterioration. Transcriptomic analyses indicate that most of the calcium ion (Ca2+) sensor genes are upregulated in cassava tuberous roots at different postharvest stages. Exogenous CaCl2 reduces postharvest physiological deterioration, increases the endogenous levels of Ca2+ and melatonin, reduces the degradation of ascorbic acid and starch, and induces the expression of genes related to melatonin biosynthesis after harvest. These effects are reversed by the exogenous application of a Ca2+ chelator (EGTA). Exogenous melatonin also increases endogenous melatonin levels and reduces ascorbic acid and starch degradation during postharvest physiological deterioration but do not affect endogenous Ca2+ content. Together, these findings demonstrate that calcium-induced activation of melatonin biosynthesis plays a role in reducing postharvest physiological deterioration and quality loss in cassava. Additionally, pretreatment with EGTA arrests the melatonin-induced reduction of postharvest physiological deterioration, suggesting the possible crosstalk between melatonin and calcium during postharvest physiological deterioration.
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