SD: stomatal density; gs: stomatal conductance; E: transpiration rate; A: net CO2 assimilation rate; DW: dry weight; FW: fresh weight.
Photosynthetic rate (A) was calculated as A = F(Cr-Cs)/100S-CsE, where A = net assimilation rate (μmol CO2/m/s), F = molar flow rate of air entering the leaf chamber (μmol/s), Cr = mole fraction of CO2 in the reference IRGA (infra-red gas analyzer) (μmol CO2/mol air), Cs = mol fraction of CO2 in the sample IRGA (μmol CO2/mol air), S = leaf area (cm), and E = transpiration rate (mol H2O/m/s).
Biomass at harvest was significantly greater in NIL-3 than in 'Koshihikari' owing to a higher net assimilation rate during ripening, resulting in a higher grain yield.
The rate of biomass production, however, may not adequately reflect the metabolic rate or the rate of resource use because growth rates only provide estimates of an organism's net assimilation, and exclude any dissimilation energy.
Net assimilation (A) and leaf dark respiration (R) were measured with a portable photosynthesis system in open path configuration (LI6400; Li-Cor, Lincoln, NE, USA) equipped with a blue red LED light source (LI6400-02B) and a CO2 injection system (LI6400-01).
The leaf area efficiency (EA) is an approximation of the net assimilation rate by Hirose (1984) and indicates a net photosynthesis minus respiration loss.
a Effect on the net assimilation specific rate, b effect on the total CO2 captured amount.
The soil temperature and soil moisture are improved by the transparent plastic mulch, and the plastic mulch not only suppresses the CO2 generated by soil respiration but also affects CO2 budget as a result of the net assimilation controlled by the soil water and heat conditions.
Net assimilation (A) is plotted on the y-axis, and photosynthetically active radiation (PAR) is plotted on the x-axis.
Net assimilation (A) was measured on one leaf per plant between 1000 and 1200 h on the first, third and fifth day of the warm and cool periods (which correspond to days 1, 3, 5, 7, 9 and 11 of the temperature cycle; Fig. 1).
This resulted in a 28% reduction in drought-induced midafternoon depression in net assimilation rate (A).
