Cytokinin Promotes Jasmonic Acid Accumulation in the Control of Maize Leaf Growth.

ABSTRACT: Plant organ growth results from the combined activity of cell division and cell expansion. The co-ordination of these two processes depends on the interplay between multiple hormones that determine the final organ size. Using the semidominant Hairy Sheath Frayed1 (Hsf1) maize mutant that hypersignals the perception of cytokinin (CK), we show that CK can reduce leaf size and growth rate by decreasing cell division. Linked to CK hypersignaling, the Hsf1 mutant has an increased jasmonic acid (JA) content, a hormone that can inhibit cell division. The treatment of wild-type seedlings with exogenous JA reduces maize leaf size and growth rate, while JA-deficient maize mutants have increased leaf size and growth rate. Expression analysis revealed the increased transcript accu

SUBMITTER: Uyehara AN 

PROVIDER: S-EPMC10459232 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature