The PATROL1 function in roots contributes to the increase in shoot biomass

Area of Science:

• Plant Biology
• Molecular Plant Science

Background:

• PATROL1 (PROTON ATPase TRANSLOCATION CONTROL 1) facilitates AHA1 H+-ATPase trafficking to guard cell plasma membranes, promoting stomatal opening and photosynthesis.
• PATROL1 expression extends beyond stomata to root tissues, but its function in roots remained uncharacterized.

Purpose of the Study:

• To elucidate the role of PATROL1 in root development and its contribution to overall plant biomass.
• Investigate PATROL1 function in roots using loss-of-function and overexpressing mutants.

Main Methods:

• Cytological analysis of root meristem size in PATROL1 mutants and overexpressors.
• Grafting experiments to assess shoot and root interactions and biomass contribution.
• Analysis of AHA1 localization in root epidermal cells.

Main Results:

• Loss-of-function mutants exhibited reduced root meristem size and shorter primary roots.
• Grafting experiments demonstrated that PATROL1 in roots significantly enhances shoot biomass.
• PATROL1's role in root meristem activity is cell-autonomous and distinct from its stomatal function.

Conclusions:

• PATROL1 is crucial for root meristem activity, directly impacting plant biomass.
• The protein influences shoot biomass through its function in root development.
• PATROL1 may employ different mechanisms in roots compared to guard cells for AHA1 regulation.