Open AccessEffects of different light quality ratio on growth and photosynthesis capacity in pakchoi under excess nitrate stress
Author(s) -
Zelin Li,
Guangyou Chen,
Fuqiang Gao,
Jiaping Luo,
Chunwen Li,
Zhongqun He,
Xiaoting Zhou
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/621/1/012105
Subject(s) - photosynthesis , nitrate , hydroponics , yield (engineering) , chemistry , stress (linguistics) , horticulture , biology , materials science , biochemistry , organic chemistry , metallurgy , linguistics , philosophy
In this study, light-emitting diode (LED) was used as light source to cultivate pakchoi in hydroponics. The effects of red light and far red light ratio (R: FR) of 0.7, 1.0 and 4.2(CK) on the growth and photosynthetic characteristics of pakchoi under different nitrate stress concentrations were studied. The results showed that the growth indexes, gas exchange parameters (except intercellular CO 2 concentration) of pakchoi decreased significantly under excess nitrate stress. And the growth of pakchoi was more inhibited under high nitrate stress concentration. Under low R: FR ratio, the growth indexes and net photosynthetic rate of pakchoi increased significantly, while the intercellular CO 2 concentration decreased significantly, and the effect was achieved when R:FR=0.7. Therefore, reducing R: FR ratio can alleviate the inhibition of excess nitrate stress on the growth and improve the yield of pakchoi.