3.1 | Changes in growing S. miltiorrhizaseedlings
Abiotic stress is not conducive to the growth of S. miltiorrhizaseedlings, among which P, synergistic stresses of drought and nitrogen
deficiency (DN), synergistic stresses of drought, nitrogen deficiency
and phosphorus deficiency (DNP) and synergistic stresses of drought,
high-temperature, nitrogen deficiency and phosphorus deficiency (DTNP)
stresses reached a significant level (p <0.05). P, DN,
synergistic stresses of drought, high-temperature and nitrogen
deficiency (DTN), synergistic stresses of drought high-temperature and
phosphorus deficiency (DTP), DNP, synergistic stresses of
high-temperature, nitrogen deficiency and phosphorus deficiency (TNP),
and DTNP stresses significantly inhibited the fresh weight of
aboveground parts of S. miltiorrhiza (p <0.05)
(Figure 1). Drought or synergistic stresses of drought and
high-temperature exacerbated the plant growth inhibition of nitrogen
deficiency, but not significantly. (e.g., DN and DTN stresses) (Figure
1-a). Drought or high-temperature or synergistic stresses of drought and
high-temperatures alleviated the plant growth inhibition of phosphorus
deficiency, but not significantly. (e.g., DP, TP, and DTP stresses)
(Figure 1-b). Synergistic stresses of drought and high-temperatures
aggravated the plant growth inhibition of nitrogen and phosphorus
deficiency (e.g., DTNP stresses) (p <0.05) (Figure 1-c).
The synergistic stresses of drought and high-temperatures exacerbated
the effects of single-factor inhibition, but not to a significant extent
(e.g., DT stress) (Figure 1-d).