A gain-of-function mutation in SlUVR8 reveals critical roles of UV-B signaling in tomato development and stress tolerance.
Studying the functions of the UV-B photoreceptor UVR8 in large, indeterminate-growth tomato plants is challenging due to the difficulty of applying uniform UV-B irradiation. To overcome this limitation, we generated a constitutively active photoreceptor variant, SlUVR8W289A, by substituting tryptophan 289 with alanine....