中国生态农业学报（中英文）2024，Vol.32Issue(5)：839-850,12.DOI:10.12357/cjea.20230729
不同蓝光强度连续供光对生菜形态建成、光合特性及营养离子吸收的影响
Effects of different blue light intensities with continuous light on morphogenesis,photosynthetic characteristics and nutrient ion absorption of lettuce
摘要
Abstract
As the sole light source in a plant factory is light,optimization and regulation of the light environment are the most crucial ways to improve the yield and quality of fruits and vegetables.Blue light plays an important role in regulating plant morphology and photosynthetic characteristics.Previous studies on continuous light have mainly focused on red and blue light,and there have been few studies on the utilization of blue light to optimize plant morphogenesis.To explore the effects of different intensities of blue light on the growth and morphological establishment of fruits and vegetables in plant factories with continuous light,this experiment took"Tiberius"lettuce as the research materials and divided the 24-h cycle into two periods.Period one(H1)was 18:00-10:00 the next day,while period two(H2)was 10:00-18:00.During period H1,the light environment conditions of each treatment were the same,the light intensity was 200 μmol·m-2·s-1,and the red to blue ratio was 4∶1 including the control group(B0,without light)and three light intensities of 28 μmol·m-2·s-1(B28),60 μmol·m-2·s-1(B60),and 100 μmol·m-2·s-1(B100).The results showed that 1)compared with B0,the plant height and the angle between the stem and leaf and the horizontal plane of lettuce under treatments B28,B60,and Bl00 were significantly increased.With the decrease in blue light intensity,the plant height of lettuce increased,the angle between stem and horizontal plane increased,and the leaves were slender;2)compared with the treatment B0,the stomata density in the leaf abdo-men under treatments B28,B60,and B100 decreased by 30.8％,34.6％,and 25.0％,respectively,and the leaf thickness decreased by 15.9％,28.4％,and 8.8％,respectively;3)blue light promoted the increase in chlorophyll a,chlorophyll b,and the redistribution of the chlorophyll a/b ratio,among which the highest chlorophyll content was observed under treatment B60,whereas no significant differ-ence in chlorophyll content was found among treatment B28 and Bl00;4)compared with the treatment B0,the transpiration rate un-der treatments B28,B60,and B100 increased by 30.8％,38.5％,and 30.8％,respectively,contributing to the absorption of nutrients by plants.The highest nitrogen,magnesium,potassium,and iron ion contents were obtained under treatment B28,which increased by 18.2％,33.3％,65.9％,and 72.7％,respectively,compared to those under treatment B0.In summary,blue light supplementation dur-ing period H2 was found to enhance the height of lettuce plants,widen the angle between the stems and the horizontal plane,and pro-mote a more compact shape.Interestingly,lower blue light intensities resulted in greater increases and more pronounced morpholo-gical changes.Additionally,blue light supplementation during period H2 led to a reduction in leaf thickness and facilitated the accu-mulation of photosynthetic pigments,but increased stomatal conductance,which is beneficial for the absorption of nutrients in the leaves.Therefore,in a plant factory,continuous light combined with different blue light intensities can purposefully regulate the mor-phology and photosynthetic characteristics of lettuce,thereby increasing the number of cultivated plants and the yield per unit area.关键词
生菜/连续供光/蓝光/形态/光合特性/离子吸收Key words
Lettuce/Continuous light/Blue light/Form/Photosynthetic characteristics/Ion absorption分类
农业科技引用本文复制引用
贾梦晗,杨洋,张一含,陈灿,仝宇欣..不同蓝光强度连续供光对生菜形态建成、光合特性及营养离子吸收的影响[J].中国生态农业学报（中英文）,2024,32(5):839-850,12.基金项目
内蒙古自治区重点研发计划项目(2022YFDZ0086)资助 This study was supported by the Key R&D Project of Inner Mongolia Autonomous Region(2022YFDZ0086). （2022YFDZ0086）
