Preharvest application of silicon reduces internal browning development of pineapple (Ananas comosus 'Mauritius') during cold storage: a novel approach
Internal browning, commonly encountered in pineapple during prolonged cold storage, is a major obstacle to long distance export of fruits under sea freight. In the present study, preharvest application of silicon as a spray treatment of sodium silicate or soil incorporation of partially burnt rice hull (PBRH) were applied in pineapple cultivar 'Mauritius' cultivated in the farmers' fields at Radawana in Western Province of Sri Lanka. Three silicon treatments; i.e., spraying of sodium silicate at 0, 50 or 100 mg L‑1 were used in each trial and treatments were arranged in a randomized complete block design with three replicates. Silicon as a form of PBRH was incorporated into soil, two weeks prior to planting pineapple beds, based on the results of the leaching study. Accordingly, three different treatments were used; 2 and 4 kg m‑2 bed or non-treated control as no application of PBRH. Some preharvest parameters of pineapple fruit (fruit length and circumference) and crown length were measured at one-month intervals. Some postharvest parameters of fruits such as TSS, TA and pH, % weight loss of fruits were evaluated in all treated and non-treated fruits. Internal browning was assessed in treated fruits and non-treated controls after storing fruits at 10°C under cold storage for 21 days. The significant reduction of internal browning (over 75%) was observed in fruits obtained from crops treated at 2 or 4 kg of PBRH m‑2 bed compared to controls. Similarly, there was a significant reduction of IB (over 75%) observed in fruits obtained from crops treated with 50 mg L‑1 sodium silicate. However, IB was reduced by 48% in the fruits treated at 100 mg L‑1 sodium silicate. There were no sigficant differences in fuit or crown parameters or physico chemical parameters (TSS, pH or TA) observed in silicon treatment given either as PBRH or sodium silicate compared with non-treated controls.
Weerahewa, H.L.D. and Wicramasekara, I. (2020). Preharvest application of silicon reduces internal browning development of pineapple (Ananas comosus 'Mauritius') during cold storage: a novel approach. Acta Hortic. 1278, 39-44
'Mauritius' pineapple, silicon, partially burnt ricehull, internal browning disorder