| Comments |
"[Researchers] also examined the influence of chloroplast envelope CO2
permeability on the photosynthetic capacity of leaves from
controls and Nt AQP1–deficient RNAi plants. During illumination,
the leaf internal CO2 partial pressure (ci) was similar in RNAi plants
and control plants. However, photosynthetic rates were reduced by 15% in the former (Table 1), confirming [their] findings on Nt
AQP1 antisense plants (Uehlein et al., 2003). The inhibition of
AQP1 expression also resulted in a slight reduction of stomata
conductance that could potentially limit photosynthesis by limiting
uptake of CO2 into leaves. However, the ratio of net assimilation
rate (A) to ci was significantly higher in controls (Table 1). As
Flexas et al. (2006) showed that tobacco plants with impaired
expression of AQP1 exhibit the same amount and activity of
Rubisco, the change in A/ci points to a change of mesophyll
conductance." See note beneath table |