Abstract
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.
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Claims 9
Claim · model-written summary
Sx1 was the most sensitive genotype to partial nitrate replacement by ammonium based on root and shoot biomass.
- Taxon
- lettuce
Lactuca sativat0 - Material
- Sx1e0
- Treatment
- partial NO3- replacement by NH4+e0
- Outcome
- mostly sensitive genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
t0“lettuce”
Claim · model-written summary
Nrnct was the most insensitive genotype to partial nitrate replacement by ammonium based on root and shoot biomass.
- Taxon
- lettuceLactuca sativat0
- Material
- Nrncte0
- Treatment
- partial NO3- replacement by NH4+e0
- Outcome
- mostly insensitive genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
t0“lettuce”
Claim · model-written summary
Sx1 root surface area and root length were highest at a 25:75 ammonium/nitrate ratio.
- Taxon
- lettuceLactuca sativat0
- Material
- Sx1e0
- Treatment
- 25:75 of NH4-N:NO3-Ne0
- Outcome
- Total root surface area, root lengthe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
t0“lettuce”
Claim · model-written summary
Sx1 SPAD readings and net photosynthesis rate were highest at a 25:75 ammonium/nitrate ratio.
- Taxon
- lettuceLactuca sativat0
- Material
- Sx1e0
- Treatment
- 25:75 of NH4-N:NO3-Ne0
- Outcome
- SPAD readings and net photosynthesis ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
t0“lettuce”
Claim · model-written summary
Nrnct root surface area and root length were highest at a 25:75 ammonium/nitrate ratio.
- Taxon
- lettuceLactuca sativat0
- Material
- Nrncte0
- Treatment
- 25:75 of NH4-N:NO3-Ne0
- Outcome
- Total root surface area, root lengthe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
t0“lettuce”
Claim · model-written summary
Nrnct SPAD readings and net photosynthesis rate were highest at a 25:75 ammonium/nitrate ratio.
- Taxon
- lettuceLactuca sativat0
- Material
- Nrncte0
- Treatment
- 25:75 of NH4-N:NO3-Ne0
- Outcome
- SPAD readings and net photosynthesis ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
t0“lettuce”
Claim · model-written summary
Sx1 improved more than Nrnct under moderate ammonium nutrition.
- Taxon
- lettuceLactuca sativat0
- Material
- Sx1e0
- Treatment
- NH4-N:NO3-N=25:75e0
- Outcome
- greater improvemente0
- Direction
- greater improvemente0
- Comparator
- Nrncte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sx1 had a greater improvement than Nrnct under moderate NH4+ nutrition (NH4-N:NO3-N=25:75).”
t0“lettuce”
Claim · model-written summary
Sx1 nitrate release and remobilization from vacuoles to cytoplasm were stronger than Nrnct.
- Taxon
- lettuceLactuca sativat0
- Material
- Sx1e0
- Organ / stage
- vacuoles to cytoplasme0
- Outcome
- capacities of NO3- release and remobilizatione0
- Direction
- strongere0
- Comparator
- Nrncte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The capacities of NO3- release and remobilization from vacuoles to cytoplasm of Sx1 were stronger than those of Nrnct.”
t0“lettuce”
Claim · model-written summary
The authors suggest choosing an appropriate lettuce cultivar and nitrogen ratio to improve nitrogen use and reduce nitrate content.
- Taxon
- lettuceLactuca sativae0
- Outcome
- planting the appropriate lettuce cultivar in a proper NH4-N/NO3-N ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”