Journal of Experimental Botany, Vol 49, 1227-1234, Copyright © 1998 by Oxford University Press
F Meinzer and J Zhu
Nitrogen deficiency reduces the photosynthetic capacity of both C3 and C4
plants. The regulation of photosynthetic gas exchange in eight clones of
the C4 grass, sugarcane (Saccharum spp.), grown at
three levels of N availability was studied to determine whether N stress
diminishes the efficiency of the C4 CO2 concentrating system in addition to
reducing overall rates of photosynthesis. The quantum yield for CO2 uptake
decreased linearly with decreasing leaf N content. Genetic variation in
quantum yield at a given level of N supply was also observed. Leaf tissue
carbon isotope discrimination (
ARTICLES
Nitrogen stress reduces the efficiency of the C4 CO2 concentrating system, and therefore quantum yield, in Saccharum (sugarcane) species
Hawaii Agriculture Research Center, 99-193 Aiea Heights Drive, Suite 300, Aiea, HI 96701, USA; Corresponding author; e-mail: meinzer@hawaii.edu
) increased linearly with
decreasing quantum yield. Concurrent determinations of the prevailing ratio
of intercellular to ambient partial pressure of CO 2
(pi/pa) during leaf gas exchange
suggested that the observed variation in was almost entirely
attributable to variation in bundle sheath leakiness to CO2 (
)
rather than pi/pa. Taken
together, these results point to substantial environmental and genetic
variation in the efficiency of the CO2 concentrating system in sugarcane.
Reduced partitioning of carboxylase activity to ribulose-1,5-bisphosphate
carboxylase relative to phosphoenolpyruvate carboxylase in N-deficient
plants suggested that the associated increase in and decline in
quantum yield may have been attributable largely to a decline in C3 cycle
activity in the bundle sheath relative to C4 cycle activity in the
mesophyll. Quantum yield and intrinsic water use efficiency (WUE) were
negatively correlated. In contrast with the trade-off between intrinsic
light- and water use efficiency, photosynthetic nitrogen-use efficiency and
intrinsic WUE were positively correlated.Keywords: C3
plants, C4 plants, nitrogen deficiency, photosynthetic capacity, sugarcane.
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