Anatomically induced changes in rice leaf mesophyll conductance explain the variation in photosynthetic nitrogen use efficiency under contrasting nitrogen supply.

BMC Plant Biology
Limin GaoShiwei Guo

Abstract

The ratio of CO2 mesophyll conductance (gm) to Ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco) content has been suggested to positively affect photosynthetic nitrogen use efficiency (PNUE). The anatomical basis of gm has been quantified, but information on the relationship between cell-level anatomies and PNUE is less advanced. Here, hydroponic experiments were conducted in rice plants supplied with ammonium (NH4+) and nitrate (NO3-) under three N levels (low, 0.71 mM; intermediate, 2.86 mM; high, 7.14 mM) to investigate the gas exchange parameters, leaf anatomical structure and PNUE. The results showed a lower PNUE in plants supplied with high nitrogen and NH4+, which was positively correlated with the gm/Rubisco ratio. A one-dimensional within-leaf model revealed that the resistance to CO2 diffusion in the liquid phase (rliq) dominated the overall mesophyll resistance (rm), in which CO2 transfer resistance in the cell wall, cytoplasm and stroma were significantly affected by nitrogen supply. The chloroplast surface area exposed to intercellular space (Sc) per Rubisco rather than the gm/Sc ratio was positively correlated with PNUE and was thus considered a key component influencing PNUE. In conclusion, our study emp...Continue Reading

References

Oct 29, 2000·Journal of Experimental Botany·L Cheng, L H Fuchigami
Aug 1, 1994·Plant Physiology·T. K. Raab, N. Terry
Mar 17, 2009·Journal of Experimental Botany·Foteini HassiotouJohn R Evans
Apr 28, 2009·Journal of Experimental Botany·John R EvansIchiro Terashima
May 13, 2009·The New Phytologist·Hendrik PoorterRafael Villar
Nov 16, 2010·Plant Physiology·Ichiro TerashimaÜlo Niinemets
Jul 17, 2012·Plant Science : an International Journal of Experimental Plant Biology·Jaume FlexasCharles R Warren
Mar 16, 2017·The New Phytologist·Yusuke OnodaMark Westoby
Apr 19, 2017·Journal of Experimental Botany·Linda-Liisa Veromann-JürgensonÜlo Niinemets
Nov 1, 2004·Functional Plant Biology : FPB·Marta S LopesJosé L Araus

❮ Previous
Next ❯

Methods Mentioned

BETA
transmission electron microscopy

Software Mentioned

ImageJ Pro Plus
varGamma

Related Concepts