Which of the following statements accurately reflects the functions and interactions of strigolactones (SLs) in plants?
1
Strigolactones primarily promote extensive shoot branching and are known to inhibit symbiotic interactions with soil organisms.
2
Cytokinins act synergistically with strigolactones to suppress shoot branching and promote root hair growth.
3
Strigolactones and auxin work in opposition during the process of apical dominance, with strigolactones promoting and auxin suppressing shoot branching.
4
Arabidopsis mutants with defects in strigolactone biosynthesis or signaling display increased shoot branching, highlighting the role of strigolactones in suppressing axillary bud outgrowth.