Table 1.
Environmental variables during the experimental period.
Fig 1.
The effect of increasing soil moisture stress (100, 80, 60, 40, and 20% ET) on soybean (a) pod number, (b) seed number, (c) individual seed weight, and (d) yield of Asgrow AG5332 and Progeny P5333RY harvested 126 d after planting.
Fig 2.
The effect of increasing soil moisture stress (100, 80, 60, 40, and 20% ET) on a soybean seed number, size, and shape of Asgrow AG5332 harvested 126 d after planting.
Each seed lot under each treatment represents 1/10 of the total fraction of seed collected from one plant. Due to the absence of significant difference for the seed number between the cultivars, seed only from one soybean cultivar is presented.
Fig 3.
Maximum germination of soybean seed from the F1 generation as a function of osmotic potential.
F1 seed was collected from the soybean cultivar (a) Asgrow AG5332 and (b) Progeny P5333RY after exposure to drought stress treatemnts of y including replacement of 100, 80, 60, 40, and 20% of the evapotranspiration demand. Symbols represent the mean of four replications, while bars represent the standard error. Lines are the best fit of a quadratic function.
Fig 4.
The germination rate of soybean seed from the F1 generation as a function of osmotic potential.
F1 seed was collected from the soybean cultivar (a) Asgrow AG5332 and (b) Progeny P5333RY after exposure to drought stress including replacement of 100, 80, 60, 40, and 20% of the evapotranspiration demand. Symbols represent the mean of four replications, while bars represent the standard error. Lines are the best fit of a quadratic function.
Table 2.
Maximum germination and estimated parameters of soybean seed from the F1 generation as a function of osmotic potential.
Fig 5.
Days to emergence and rate of emergence for the F1 generation of soybean cultivar Asgrow AG5332 and Progeny P5333RY exposed to drought stress including replacement of 100, 80, 60, 40, and 20% of the evapotranspiration demand.
Each data point is the mean of four replications pooled over cultivar, while bars represent the standard error of the mean. Lines are the best fit of a linear function.
Fig 6.
Shoot growth for the F1 generation of soybean cultivar Asgrow AG5332 and Progeny P5333RY exposed to drought stress including replacement of 100, 80, 60, 40, and 20% of the evapotranspiration demand.
Fig 7.
Root growth for the F1 generation of soybean cultivar Asgrow AG5332 and Progeny P5333RY exposed to drought stress, including replacement of 100, 80, 60, 40, and 20% of the evapotranspiration demand.