PMID- 16666581
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20100629
LR  - 20211020
IS  - 0032-0889 (Print)
IS  - 1532-2548 (Electronic)
IS  - 0032-0889 (Linking)
VI  - 89
IP  - 2
DP  - 1989 Feb
TI  - Effects of nitrogen on mesophyll cell division and epidermal cell elongation in 
      tall fescue leaf blades.
PG  - 549-56
AB  - Leaf elongation rate (LER) in grasses is dependent on epidermal cell supply 
      (number) and on rate and duration of epidermal cell elongation. Nitrogen (N) 
      fertilization increases LER. Longitudinal sections from two genotypes of tall 
      fescue (Festuca arundinacea Schreb.), which differ by 50% in LER, were used to 
      quantify the effects of N on the components of epidermal cell elongation and on 
      mesophyll cell division. Rate and duration of epidermal cell elongation were 
      determined by using a relationship between cell length and displacement velocity 
      derived from the continuity equation. Rate of epidermal cell elongation was 
      exponential. Relative rates of epidermal cell elongation increased by 9% with 
      high N, even though high N increased LER by 89%. Duration of cell elongation was 
      approximately 20 h longer in the high- than in the low-LER genotype regardless of 
      N treatment. The percentage of mesophyll cells in division was greater in the 
      high- than in the low-LER genotype. This increased with high N in both genotypes, 
      indicating that LER increased with cell supply. Division of mesophyll cells 
      adjacent to abaxial epidermal cells continued after epidermal cell division 
      stopped, until epidermal cells had elongated to a mean length of 40 micrometers 
      in the high-LER and a mean length of 50 micrometers in the low-LER genotype. The 
      cell cycle length for mesophyll cells was calculated to be 12 to 13 hours. 
      Nitrogen increased mesophyll cell number more than epidermal cell number: in both 
      genotypes, the final number of mesophyll cells adjacent to each abaxial epidermal 
      cell was 10 with low N and 14 with high N. A spatial model is used to describe 
      three cell development processes relevant to leaf growth. It illustrates the 
      overlap of mesophyll cell division and epidermal cell elongation, and the 
      transition from epidermal cell elongation to secondary cell wall deposition.
FAU - Macadam, J W
AU  - Macadam JW
AD  - Department of Agronomy, University of Missouri, Columbia, Missouri 65211.
FAU - Volenec, J J
AU  - Volenec JJ
FAU - Nelson, C J
AU  - Nelson CJ
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Plant Physiol
JT  - Plant physiology
JID - 0401224
PMC - PMC1055880
EDAT- 1989/02/01 00:00
MHDA- 1989/02/01 00:01
PMCR- 1990/02/01
CRDT- 1989/02/01 00:00
PHST- 1989/02/01 00:00 [pubmed]
PHST- 1989/02/01 00:01 [medline]
PHST- 1989/02/01 00:00 [entrez]
PHST- 1990/02/01 00:00 [pmc-release]
AID - 10.1104/pp.89.2.549 [doi]
PST - ppublish
SO  - Plant Physiol. 1989 Feb;89(2):549-56. doi: 10.1104/pp.89.2.549.