Articles
EFFECTS OF LOW LIGHT INTENSITY ON PHOTOSYNTHETIC CAPACITY, PHOTOSYNTHETIC NITROGEN UTILIZATION EFFICIENCY AND NITROGEN PARTITION IN NON-HEADING CHINESE CABBAGE LEAVES
Article number
761_30
Pages
235 – 242
Language
English
Abstract
Non-heading Chinese cabbage (Brassica campestris L. ssp. chinensis Makino) originated in China, and is very important and popular there.
However, the protected culture of non-heading Chinese cabbage formed a low light intensity-growing environment, which has an adverse influence on the yield and quality of the plant.
In this paper, using low light tolerant Aiwang and low light intolerant Lvyou as materials, giving the light intensity of 12.5%, 25%, 60% and 100% sunlight respectively, growth and photosynthesis, leaves nitrogen content and the leaves nitrogen distribution in the two cultivars were studied.
The results showed that the maximum net photosynthesis (Pmax), light saturation point (LSP), lamina mass per unit area (LMA), plastochron index (PI) decreased with reduction of light intensity, but the indices of Aiwang were all higher than Lvyou. The two cultivars are susceptible to photoinhibition while Aiwang is mild.
The fraction of leaf nitrogen in thylakoid light harvesting systems (PL) enhanced with the decline of light intensity.
The distribution coefficient for leaf nitrogen in bioenergetics (PB) changed insignificantly under different light intensity.
The partitioning coefficient for leaf nitrogen in Rubisco (PC) of the two cultivars reached its peak at the light intensity of 60% sunlight.
All above indices of Aiwang were higher than Lvyou under low light intensity.
However, the protected culture of non-heading Chinese cabbage formed a low light intensity-growing environment, which has an adverse influence on the yield and quality of the plant.
In this paper, using low light tolerant Aiwang and low light intolerant Lvyou as materials, giving the light intensity of 12.5%, 25%, 60% and 100% sunlight respectively, growth and photosynthesis, leaves nitrogen content and the leaves nitrogen distribution in the two cultivars were studied.
The results showed that the maximum net photosynthesis (Pmax), light saturation point (LSP), lamina mass per unit area (LMA), plastochron index (PI) decreased with reduction of light intensity, but the indices of Aiwang were all higher than Lvyou. The two cultivars are susceptible to photoinhibition while Aiwang is mild.
The fraction of leaf nitrogen in thylakoid light harvesting systems (PL) enhanced with the decline of light intensity.
The distribution coefficient for leaf nitrogen in bioenergetics (PB) changed insignificantly under different light intensity.
The partitioning coefficient for leaf nitrogen in Rubisco (PC) of the two cultivars reached its peak at the light intensity of 60% sunlight.
All above indices of Aiwang were higher than Lvyou under low light intensity.
Authors
J. Huang, Z. Wu, S.R. Guo
Keywords
non-heading Chinese cabbage, low light intensity, photosynthetic capacity, nitrogen
Online Articles (87)