Wang, B. and Shen, Q. R. 2011. NH4 -N/NO3- -N ratios on growth and NO3--N remobilization in root vacuoles and cytoplasm of lettuce genotypes. Can. J. Plant Sci. 91: 411-417. Aerobically growing crops generally prefer nitrate (NO3-) to ammonium (NH4 ), but partial replacement of NO3- by NH4 usually makes crops grow better. Five cultivars of lettuce (Lactuca sativa L.) frequently cultivated in southeast China, including Ny, Sx1, Rw, Nct and Nrnct, were hydroponically grown in four ratios of NH4-N:NO3-N: 0:100, 10:90, 25:75 and 50:50. Based on biomass of roots and shoots of plants, Sx1 was a mostly sensitive genotype, while Nrnct was a mostly insensitive genotype to partial NO3- replacement by NH4 among the five cultivars. Total root surface area, root length, SPAD readings and net photosynthesis rate of Sx1 and Nrnct were found to be highest at 25:75 of NH4-N:NO3-N. Sx1 had a greater improvement than Nrnct under moderate NH4 nutrition (NH4-N:NO3-N=25:75). The capacities of NO3- release and remobilization from vacuoles to cytoplasm of Sx1 were stronger than those of Nrnct. The results suggest that we can improve the utilization of nitrogen and decrease the NO3- content in lettuce through planting the appropriate lettuce cultivar in a proper NH4-N/NO3-N ratio.
How to translate text using browser tools
1 April 2011
NH4 -N/NO3- -N ratios on growth and NO3- -N remobilization in root vacuoles and cytoplasm of lettuce genotypes
Bo Wang,
Qirong Shen
ACCESS THE FULL ARTICLE
It is not available for individual sale.
This article is only available to subscribers.
It is not available for individual sale.
It is not available for individual sale.
![](/ContentImages/journals/cjps/91/2/2/WebImages/116.091.0200.cover.jpg)
Canadian Journal of Plant Science
Vol. 91 • No. 2
April 2011
Vol. 91 • No. 2
April 2011
Laitue (Lactuca sativa L.)
Lettuce (Lactuca sativa L.)
NH4-N/NO3-N ratio
NO3--N remobilization
ratio N-NH4/N-NO3
remobilisation du N-NO3