The abstract is read at the publisher; the summary is JClub's.
PIFs transcriptionally activate KTN1 to regulate katanin-mediated microtubule severing, and pifq mutants show reduced severing frequency and dwell time in Arabidopsis hypocotyls.
- Why it matters: Skotomorphogenesis requires PIF-dependent control of cell elongation, but how PIFs coordinate microtubule remodeling with microtubule severing was unclear.
- What they did: In Arabidopsis and Setaria italica, microtubule-severing defective mutants (lue1, ktn80.1234, and Siktn1) had shortened hypocotyls/mesocotyls and abnormal microtubule arrays; pifq mutants reduced KTN1 and KTN80 expression, and PIFs activated KTN1 transcription.
- The result: Live-cell imaging showed pifq mutants have reduced severing frequency and shorter katanin-complex dwell time, supporting a PIF–katanin mechanism that fine-tunes hypocotyl/mesocotyl elongation during skotomorphogenesis.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.