Table 3.
Effects of moderate and severe water stress on leaf water potential, total biomass accumulation, leaf to stem ratio, stem to root ratio, and relative water content in A. annua plants. EVS, early vegetative stage; LVS, late vegetative stage; PGS, plant growth stage; PFS, preflowering stage; FS, flowering stage; C, control; MS, moderate stress; SS, severe stress; T, treatment. (Values within parentheses are percent reduction (−) or increase (+) over control)
| PGS | T | Leaf water potential (MPa) | Total biomass accumulation | Leaf to stem ratio | Stem to root ratio | Relative water content (MPa) |
|---|---|---|---|---|---|---|
| EVS | C | −0.32 ± 0.06 | 17.04 ± 1.52 | 0.31 ± 0.04 | 6.78 ± 2.89 | 43.20 ± 5.43 |
| MS | −0.40 ± 0.06 (−25.00) | 11.2 ± 1.56 (−34.30) | 0.35 ± 0.17 (+18.00) | 6.94 ± 0.44 (−4.49) | 40.90 ± 1.88 (−5.35) | |
| SS | −0.57 ± 0.06 (−75.00) | 6.33 ± 0.43 (−62.85) | 0.23 ± 0.09 (−25.91) | 5.88 ± 1.59 (−17.15) | 40.20 ± 3.94 (−7.03) | |
| LVS | C | 0.65 ± 0.06 | 93.30 ± 2.99 | 0.20 ± 0.03 | 12.70 ± 2.78 | 44.91 ± 3.43 |
| MS | −0.73 ± 0.10 (−13.00) | 32.33 ± 2.73 (−65.30) | 0.35 ± 0.02 (+75.00) | 7.20 ± 1.70 (−43.10) | 44.60 ± 5.97 (−0.66) | |
| SS | −0.81 ± 0.06 (−25.00) | 19.51 ± 2.70 (−79.09) | 0.36 ± 0.06 (+78.40) | 8.38 ± 2.45 (−31.21) | 45.75 ± 4.51 (+1.88) | |
| PFS | C | −0.73 ± 0.10 | 160.88 ± 2.59 | 0.31 ± 0.03 | 8.30 ± 1.40 | 65.35 ± 4.94 |
| MS | −0.81 ± 0.06 (−11.10) | 62.12 ± 2.56 (−61.40) | 0.48 ± 0.03 (+52.00) | 10.50 ± 2.52 (+28.30) | 45.37 ± 1.75 (−30.60) | |
| SS | −0.89 ± 0.06 (−22.20) | 58.10 ± 2.59 (−63.90) | 0.40 ± 0.09 (+26.90) | 12.51 ± 3.51 (+53.70) | 43.40 ± 3.35 (−33.60) | |
| FS | C | −1.05 ± 0.06 | 68.93 ± 2.99 | 0.31 ± 0.02 | 12.90 ± 2.82 | 70.06 ± 1.28 |
| MS | −1.13 ± 0.06 (−7.70) | 29.98 ± 2.67 (−56.50) | 0.37 ± 0.09 (+23.00) | 6.67 ± 2.07 (−47.90) | 55.59 ± 3.37 (−20.70) | |
| SS | −1.21 ± 0.10 (−15.4) | 17.40 ± 2.13 (−74.76) | 0.38 ± 0.09 (+23.50) | 6.73 ± 1.08 (−48.60) | 52.59 ± 1.98 (−24.93) |