scholarly journals Single leaf photosynthesis of rice plants under field conditions. VII. Evaluation of the degree of real contribution of stomatal conductance to the individual variation and to the depression with time of day in single leaf photosynthesis.

1990 ◽  
Vol 59 (1) ◽  
pp. 125-129 ◽  
Author(s):  
Eiki KURODA ◽  
Atsuhiko KUMURA
Keyword(s):  
Stomatal Conductance ◽  
Individual Variation ◽  
Time Of Day ◽  
Field Conditions ◽  
Leaf Photosynthesis ◽  
Rice Plants ◽  
Single Leaf ◽  
The Individual

scholarly journals Irrigated Soybean Leaf Photosynthesis in the Humid Subtropical Midsouth

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
H. Arnold Bruns
Keyword(s):  
Stomatal Conductance ◽  
Growth Stage ◽  
Cultivar Differences ◽  
Photon Flux ◽  
Growth Stages ◽  
Base Temperature ◽  
Leaf Photosynthesis ◽  
Photosynthetic Photon Flux ◽  
Single Leaf ◽  
Soybean Leaf

Photosynthesis (CER (μmol CO2mleaf area-2 s−1)), stomatal conductance (gsw), and intercellular [CO2] (Ci) of soybean (Glycine maxL. Merr.) grown using the early soybean production system (ESPS) of the midsouth were determined. Three irrigated cultivars were grown using ESPS on Bosket (Mollic Hapludalfs) and Dundee (Typic Endoaqualf) soils in 2011 and 2012 at Stoneville, MS. Single leaf CER,gsw, andCiwere determined at growth stages R3, R4, and R5 using decreasing photosynthetic photon flux densities (PPFD,μmol m−2 s−1) beginning at 2000 PPFD and decreasing by 250 PPFD increments to 250 PPFD. Photosynthesis changes fit a quadratic polynomial for all fixed variables and range from ~6.0 and 9.0 CER at 250 PPFD and ~22.0 to 28.0 CER at 2000 PPFD. No cultivar differences in CER,gsw, orCiwere noted at any growth stage or site either year. In 2012, CER,gsw, andCiwere lower when measured at R5 than the two previous growth stages, which was not observed in 2011. The R5 sampling in 2012 had accumulated 39 to 70 more growing degree units at 10°C base temperature (GDU 10’s) than in 2011 and were likely more mature. Increased soybean yields from ESPS appear not to result from higher leaf CER.

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