采前红蓝光连续光照光强对水培生菜生长、品质及AsA代谢的影响

doi:10.13304/j.nykjdb.2020.1008

摘要/Abstract

摘要：

为了探明采收前发光二极管（LED）红（R）蓝（B）光连续光照对生菜（Lactucasativa）生长与抗坏血酸（ascorbic acid，AsA）代谢的影响，在密闭植物工厂内，以红蓝LED（红光∶蓝光=4∶1）为光源，在采收前对水培生菜进行强度分别为100、150、200、300和500 μmol·m^-2·s^-1的72 h连续光照，研究了采前连续光照光强对水培生菜生长、品质、AsA含量和关键酶活性的影响。结果表明：从产量角度来看，随着采前连续光照光强的升高，生菜地上部的鲜重和干重升高，根的鲜重和干重升高，生菜叶面积、干物质含量均显著增加，生菜的产量也逐渐提高。从品质来看，生菜叶片中可溶性糖含量随连续光照光强的升高而升高，硝酸盐含量随光强的升高逐渐降低。采前LED连续光照处理后，随着连续光照光强的升高，生菜叶片中AsA含量逐渐升高，生菜叶片DHA含量呈先升高后降低的趋势。

关键词: 生菜, 水培, 连续光照, 光强, 抗坏血酸

Abstract:

In order to explore the effects of continuous light of LED red （R） blue （B） light on the growth and ascorbic acid （AsA） metabolism of lettuce （Lactucasativa L.） before harvesting， a red and blue LED （R∶B=4∶1） was used in a closed plant factory as the light source. Before harvesting， the hydroponic lettuce was subjected to 72 h continuous illumination with light intensity of 100， 150， 200， 300 and 500 μmol·m^-2·s^-1. The effect of front continuous light intensity on the growth， quality， AsA content and key enzyme activities of hydroponic lettuce. The results showed that： from the perspective of yield， with the increase of the continuous light intensity before harvest， the fresh weight and dry weight of the above ground of the lettuce increased， the fresh weight and dry weight of the root increased， and the leaf area and dry matter content of the lettuce both increased significantly， and the yield of lettuce had gradually increased. From quality point， the soluble sugar content in lettuce leaf increased with the continuous light intensity， and the nitrate content gradually decreased with the light intensity. After the LED continuous light treatment before harvest， as the continuous light intensity increased， the AsA content in the lettuce leaf gradually increased， and the DHA content in the lettuce leaves increased first and then decreased.

Key words: lettuce, hydroponics, continuous light, light intensity, ascorbic acid

中图分类号:

S636

刘家源, 张玉彬, 刘文科. 采前红蓝光连续光照光强对水培生菜生长、品质及AsA代谢的影响[J]. 中国农业科技导报, 2022, 24(5): 76-84.

Jiayuan LIU, Yubin ZHANG, Wenke LIU. Effects of Preharvest Red and Blue Continuous Light Intensity on Growth， Quality and AsA Metabolism of Hydroponics Lettuce[J]. Journal of Agricultural Science and Technology, 2022, 24(5): 76-84.

图/表 7

图1 采前LED连续光照光强对产量指标的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.1 Effects of LED continuous light intensity on lettuces yield indexes before harvestNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate significant difference at P<0.05 level.

图2 采前LED连续光照光强对生菜形态指标的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.2 Effects of LED continuous lighting intensity on morphological indexes of lettuce before harvestNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate significant difference at P<0.05 level.

图3 采前LED连续光照光强对生菜光合特性的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.3 Effects of LED continuous light intensity on photosynthetic characteristics of lettucesNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate significant difference at P<0.05 level.

图4 采前LED连续光照光强对生菜可溶性糖和硝酸盐含量的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.4 Effects of LED continuous lighting intensity on soluble sugar and nitrate contents of lettuces before harvestNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate significant difference at P<0.05 level.

图5 采前LED连续光照光强对生菜AsA和DHA含量的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.5 Effects of LED continuous light intensity on ASA and DHA contents of lettuces before harvestNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate significant difference at P<0.05 level.

图6 采前LED连续光照光强对生菜GalLDH酶活性的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.6 Effects of LED continuous light intensity on the GalLDH activities in lettuces before harvestNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate signifi-cant difference at P<0.05 level.

图7 采前LED连续光照光强对生菜APX、MDHAR、DHAR和GR酶活性的影响注：虚线表示采收前连续光照处理前的取样。不同小写字母表示差异显著（P<0.05）。

Fig.7 Effects of LED continuous light intensity on APX， MDHAR， DHAR and GR activities of lettuces before harvestNote： Dotted lines indicate samples taken before harvesting and continuous light treatment. Different small letters indicate significant difference at P<0.05 level.

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