Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia 43400 UPM Serdang, Selangor, D.E. Malaysia.
J Sci Food Agric. 2011 Jan 30;91(2):278-85. doi: 10.1002/jsfa.4182.
Determination of physico-chemical (weight, length, diameter, stomatal density, respiration rate, colour, soluble solids concentration, titratable acidity, chlorophyll and betacyanin content) and structural changes of red-fleshed dragon fruit (Hylocereus polyrhizus (Weber) Britton & Rose) was carried out from 5 to 35 days after pollination (DAP) in order to explain their growth, development, maturations and ripening stages.
Fruit growth of red-fleshed dragon fruit followed a sigmoid growth pattern. Significant changes in colour were obtained in both peel and pulp as DAP progressed, which were indicated by reductions of L*, C* and h° values as both changed from green to red-violet colour at ripening. Red-violet betacyanin was manifested earlier in pulp at 25 DAP, followed by peel 4-5 days later, and finally both peel and pulp turned full red-violet by 30 DAP. There was a significant increase in soluble solids concentration and titratable acidity with the continuous increase in betacyanin content as DAP progressed.
The physico-chemical and betacyanin accumulation of red-fleshed dragon fruit changed as it developed, matured and ripened which coincided with structural changes.
为了解红龙果的生长、发育、成熟和成熟阶段，从授粉后 5 至 35 天（DAP）对其理化性质（重量、长度、直径、气孔密度、呼吸速率、颜色、可溶性固形物浓度、可滴定酸度、叶绿素和甜菜红素含量）和结构变化进行了测定。
红龙果的果实生长呈“S”型生长模式。随着 DAP 的进展，果皮和果肉的颜色发生了显著变化，L*、C*和 h°值的降低表明果实从绿色变为紫红色，在成熟时呈紫红色。紫红色甜菜红素在 25 DAP 时先在果肉中表现出来，然后果皮在 4-5 天后出现，最后在 30 DAP 时果皮和果肉都变成了全紫红色。随着甜菜红素含量的不断增加，可溶性固形物浓度和可滴定酸度显著增加。
随着红龙果的发育、成熟和成熟，其理化性质和甜菜红素的积累发生了变化，这与结构变化相一致。
