A TEMPORARILY RED LIGHT-INSENSITIVE MUTANT OF TOMATO LACKS A LIGHT-STABLE, B-LIKE PHYTOCHROME

作者：VANTUINEN A; KERCKHOFFS LHJ; NAGATANI A; KENDRICK RE; KOORNNEEF M

来源：Plant Physiology, 1995, 108(3): 939-947.

DOI：10.1104/pp.108.3.939

We have selected four recessive mutants in tomato (Lycopersicon esculentum Mill.) that, under continuous red light (R), have long hypocotyls and small cotyledons compared to wild type (WT), a phenotype typical of phytochrome B (phyB) mutants of other species. These mutants, which are allelic, are only insensitive to R during the first 2 days upon transition from darkness to R, and therefore we propose the gene symbol tri (temporarily red light insensitive). White light-grown mutant plants have a more elongated growth habit than that of the WT. An immunochemically and spectrophotometrically detectable phyB-like polypeptide detectable in the WT is absent or below detection limits in the tri(1) mutant. In contrast to the absence of an elongation growth response to far-red light (FR) given at the end of the daily photoperiod (EODFR) in all phyB-deficient mutants so far characterized, the tri(1) mutant responds to EODFR treatment. The tri(1) mutant also shows a strong response to supplementary daytime far-red light. We propose that the phyB-like phytochrome deficient in the tri mutants plays a major role during de-etiolation and that other light-stable phytochromes can regulate the EODFR and shade-avoidance responses in tomato.

• 出版日期1995-7