Apple fruit as a biological suppressant for potato tuber sprouting during ambient storage

Abstract

In many countries, potato (Solanum tuberosum) is a crucial carbohydrate-rich crop and staple food. However, sprouting during storage can adversely affect the quality of the harvested tubers. To maintain the postharvest quality, this study assessed the potential of apple fruit as one of the biological suppressants for potato tuber sprouting at ambient storage. Potato tubers were obtained from four commercial farms. Thereafter, they were stored in a brown paper alone (control) or with apple fruit at ±23 °C for 30-day period. Potato tubers were evaluated for their weight loss, sprouting percentage, decay and soluble sugars during storage duration. Tubers stored with apple fruit had significantly (P < 0.05) reduced physiological weight loss after 30-day storage compared to the control. The results indicated that sprouting was significantly lower on tubers stored with fruit compared to the control. Sucrose, glucose and fructose increased in tubers stored with apple fruit compared to the control, especially in tubers obtained from Jamba and Leeubult. Tubers stored with apple fruit decayed significantly compared to the control in tubers from Jamba and Leeubult. Furthermore, dry matter and starch content were significantly lower tubers stored with apples compared to the control. In conclusion, apple fruit could serve as an effective sprout suppressant for potatoes at ambient storage. Therefore, apple fruit can be adopted as an alternative sprout suppressant to synthetic ethylene gas and various chemicals such as Chloropropham.

Keywords

• Ethylene
• Potatoes
• Soluble sugars
• Sprout suppressant
• Tuber quality