Instituto de Investigaciones Biotecnológicas, Instituto Tecnológico de Chascomús (IIB-INTECH), UNSAM-CONICET, Camino Circunvalación Laguna Km 6, (B7130IWA) Chascomús, Buenos Aires, Argentina.
J Sci Food Agric. 2011 Jan 30;91(2):355-61. doi: 10.1002/jsfa.4193.
Broccoli (Brassica oleracea L.) is a rapidly perishable vegetable crop. Several postharvest treatments have been applied in order to delay de-greening. Since light has been shown to have an effect on pigment accumulation during development and darkness is known to induce senescence, the effect of continuous and periodic exposure to low-intensity white light at 22 °C on postharvest senescence of broccoli heads was assayed.
Exposure to a constant dose of 12 micromol m(-2) s(-1) was selected as the most suitable treatment and was employed for subsequent experiments. During the course of the treatments, hue and L* values as well as chlorophyll content and visual observation of florets indicated an evident delay in yellowing in treated samples compared with controls. No statistically significant differences in total protein content were found, but soluble protein content was higher in treated samples. Total and reducing sugar as well as starch levels decreased during postharvest senescence, with lower values in control samples.
The results of this study indicate that storage under continuous low-intensity light is an efficient and low-cost treatment that delays postharvest senescence while maintaining the quality of harvested broccoli florets.
西兰花（ Brassica oleracea L.）是一种极易腐烂的蔬菜作物。已经应用了几种采后处理方法来延缓变绿。由于光照已被证明对发育过程中色素积累有影响，而黑暗已知会诱导衰老，因此测定了 22°C 下连续和周期性暴露于低强度白光对西兰花头采后衰老的影响。
选择 12 微摩尔 m(-2) s(-1) 的恒定剂量作为最合适的处理，并用于后续实验。在处理过程中，色调和 L*值以及叶绿素含量和小花的视觉观察表明，与对照相比，处理样品的变黄明显延迟。总蛋白含量没有发现统计学上的显著差异，但处理样品中的可溶性蛋白含量更高。总糖和还原糖以及淀粉水平在采后衰老过程中下降，对照样品中的值较低。
本研究结果表明，连续低强度光照下贮藏是一种有效且低成本的处理方法，可延缓采后衰老，同时保持收获的西兰花小花的品质。
