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Leaf conductance and leaf water potential relationships for 2 soybean cultivars grown under controlled irrigation



Leaf conductance and leaf water potential relationships for 2 soybean cultivars grown under controlled irrigation



Agronomy Journal 71(2): 321-325



These relationships were studied in soybeans [Glycine max (L.) Merr.] by growing plants in large potometers in the field under controlled soil moisture conditions. The potometers were previously filled with the top 15 cm of a Nicollet silt loam (Aquic Hapludolls, fine-loamy mixed mesic). The plants were subjected to 4 independent drydown stress periods during critical reproductive stages of growth. Soil moisture was controlled by hand watering and the use of an automatic shelter, which covered the plots during periods of rainfall. Five levels of soil moisture were imposed during each of the 4 stress periods. Soil moisture was monitored with a neutron soil moisture probe, and leaf water potential was measured by using a pressure bomb. Leaf conductance data were collected using a diffusion porometer. Leaf conductance was significantly correlated with leaf water potential over most days; however, a unique nonlinear relationship between these 2 parameters was not established. Atmospheric demand, time of day and some type of moisture stress hardening contributed as significant sources of variation. Although not consistent over all days, these 2 cultivars differed significantly in their leaf water potential, leaf conductance relationships.

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Accession: 005799015

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