Perturbation of Anion/Cation Transport Leads to Apical Panicle Abortion in Rice by Disrupting Ca²⁺ Homeostasis.

ABSTRACT: Calcium ion (Ca²⁺) is an essential plant nutrient required for cell structure establishment, as well as a counter-cation of an anion and an intracellular messenger. Calcium is absorbed from soil by roots and delivered to shoots through the xylem. The process must be finely balanced to avoid excessive accumulation. However, the regulatory mechanisms involved in calcium homeostasis remain unclear. In this study, we identified a gain-of-function mutant of paa2, a member of the NITRATE TRANSPORTER1/PEPTIDE TRANSPORTER family (NPF), that acts as a symporter of NO₃ ^- and other cations. Ca²⁺ and some other cations were over-accumulated in the apex of developing panicles in both the gain-of-function mutant paa2 and PAA2 overexpressing plants. Apical pani

SUBMITTER: Liu B 

PROVIDER: S-EPMC12946461 | biostudies-literature | 2026 Mar

REPOSITORIES: biostudies-literature