We know that P deficiency increases SL biosynthesis and its root exudation in maize, and also its known that SL biosynthesis and levels are higher in aboveground parts of maize under water stress and in mycorrhizal maize, but I couldnt find the exact changes in SL levels of maize roots under water stress.
The discovery of SLs provided new opportunities in the last decade to explore the hormonal regulation of plant development and acclimatization to environmental constraints. These research endeavors also identified new instances of hormonal cross-talk participating in the orchestration of overall responses in plants.
see link below
Article Strigolactones Biosynthesis and Their Role in Abiotic Stress...
Strigolactones interact with how plants develop under stress reactions and also signal the opportunities for arbuscular mycorrhizal fungi and the ability of plant root phytoparasites.
Under the stress of drought and phosphorus, these components are signals which can trigger a growth of mycorrhizal fungi very positive or the growth of witchweeds quite negative for the host plants.
The signalling of strigolactones will inhibit branching and reduce aboveground growth and also stimulate a rooting response which is the adaptive reaction.
To withstand the vagaries of drought strong root systems are needed and curtailed vegetative growth.
The action of mycorrhizal fungi is to exponentially increase the effective root system if signalled by either lack of Phoosorus or water the proliferation of responsive mycorrhizal development makes the access of both water and phosphorus more accessible from limited water and phosphorus s
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