3.5 | The polysaccharide content in the medium
P, DT, and DTP stresses can significantly reduce the polysaccharides
content in the culture medium (p <0.05), and all groups
except DP, TP, and DN stresses tend to reduce the content of
polysaccharides in the culture medium (Figure 5). Additionally, drought
or high-temperature can significantly alleviate the effects of the
down-regulation of root polysaccharides secreted by phosphorus
deficiency (e.g., DP and TP stresses) (p <0.05) (Figure
5-b). However, the synergistic stresses of drought and high-temperatures
can exacerbate the suppressive effects of drought (e.g., DT stress)
(p <0.05) (Figure 5-d). These results suggest that under
abiotic stress, the root system of plants reduces the secretion of
polysaccharides, thereby reducing the consumption of carbon and energy,
but the effects of DP, TP, and DN stresses are not obvious.