Conclusion
Based on the above results, we proposed a model in which
H2S and rhizobia cooperate with each other to positively
affected water deficiency. As shown in Fig. 13, we proved that the
interaction of H2S and rhizobia have promoted the
available nitrogen content of plants through symbiotic nitrogen
fixation, which was used to reduce the damage caused by water
deficiency. This interaction also responds to the accumulation of
reactive oxygen species by regulating changes in plant metabolites,
activating the oxidative defense system, increasing the expression level
of related antioxidant genes, and regulating the expression of
osmoprotectants related genes, thereby enhancing the photosynthesis of
plants and improving the plant growth. In addition, the lipid
metabolites in leaves may play an important role in activating the
defense system to cope with water deficiency, which together provided a
better protective effect against oxidative damage for plants.