Strigolactones: New players in the nitrogen-phosphorus signalling interplay

Area of Science:

• Plant Biology
• Nutrient Signaling
• Agricultural Science

Background:

• Nitrogen (N) and phosphorus (P) are crucial macronutrients for plant growth, with fertilizers widely used.
• Understanding plant nutrient deficiency responses is vital for optimizing fertilizer use.
• Strigolactones (SLs) are known phytohormones involved in plant phosphorus (P) deficiency responses.

Purpose of the Study:

• To investigate the role of strigolactones (SLs) in nitrogen (N) starvation.
• To explore the interplay between N and P signaling pathways mediated by SLs.
• To determine if SLs act as sensors in early plant responses to N and P deficiency.

Main Methods:

• Analysis of physiological, transcriptional, and metabolic responses in wild-type and SL-deficient tomato plants.
• Experimentation under varied P and N nutrient regimes.
• Treatment with a synthetic SL analogue (2'-epi-GR24) to assess short-term effects.

Main Results:

• Plants prioritize N over P status by influencing SL biosynthesis.
• SLs modulate the expression of key genes in phosphate and nitrate signaling pathways.
• SLs regulate N-P integrators such as PHO2 and NIGT1/HHO.

Conclusions:

• SLs play a critical role as sensors in early plant responses to both N and P starvation.
• SLs are involved in mediating the N-P signaling interplay.
• The findings suggest SLs are involved in a wider range of physiological processes than previously understood.