Modulation of warm temperature-sensitive growth using a phytochrome B dark reversion variant, phyB[G515E], in Arabidopsis and rice

•Phytochrome B variant phyB[G515E] with a slow dark reversion was generated.•phyB[G515E] forms warm temperature-insensitive nuclear photobodies.•PHYB[G515E] expression inhibited the phytochrome interacting factor4-auxin pathway.•PHYB[G515E] transgenic Arabidopsis and rice showed warming-insensitive growth.•phyB[G515E] is a powerful tool for engineering warm temperature-insensitive crops.