Effects of overnight radiation with monochromatic far-red and blue light on flower budding and expression of flowering-related and light quality-responsive genes in <I>Eustoma grandiflorum</I>

Abstract

The effects of overnight radiation with monochromatic light on flower budding using far-red-and blue light-emitting diodes FR and B, respectively were investigated in Eustoma grandiflorum under controlled temperature and 8-h sunlight. Flower budding was promoted by FR and B, while it was not observed under short-day conditions with an 8-h photoperiod during the treatment period. The flower budding with FR was earlier than with B. Expression analysis of flowering-related genes and potential light quality-responsive genes was performed to find genes involved in light quality-dependent regulation of flowering. The levels of EgFTL and EgSOC1L mRNA increased preceding flower budding with FR and B, suggesting that both genes could be involved in the effects on flowering brought about by far-red and blue lights. Later and lower expression of these genes induced by B compared to FR could be associated with the weak promotion of flowering by blue light in E. grandiflorum. In potential light quality-responsive genes, the level of EgBTB-POZ1 mRNA peaked with EgFTL with FR. Collectively, EgFTL and EgSOC1 likely promote flowering with FR and B, and EgBTB-POZ1 might be possibly involved in the promotion of flowering with FR.

Characterization of the FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 Homolog SlFKF1 in Tomato as a Model for Plants with Fleshy Fruit

“…A similar control mechanism is possible for flowering because blue light delays flowering in tomato [ 53 , 54 ], and leaf SlFKF1 expression is also low under blue light. It is interesting to note that blue light promotes flowering in A. thaliana and some other long-day plants in contrast to tomato [ 10 , 21 , 55 ].…”

“…Studies using Arabidopsis thaliana have shown that these photoreceptors control plant responses, including de-etiolation, hypocotyl elongation, and photoperiodic flowering by CRY [ 2 , 3 , 4 ] and phototropism, stomatal opening, and chloroplast localization by phototropin [ 5 , 6 , 7 , 8 ], indicating that their functions are diverse. Even in long-day plants other than A. thaliana , flowering promotion by blue light, which is supposed to involve CRY, has been reported in Petunia and Eustoma [ 9 , 10 ].…”

Impact of Blue Light on Plant Growth, Flowering and Accumulation of Medicinal Flavones in Scutellaria baicalensis and S. lateriflora

“…The progression of flowering under blue light was consistently faster in both species, however, more pronounced in S. lateriflora than in S. baicalensis (Figure 3C, D). Blue light has previously been reported to be important for the onset and progression of flowering [49][50][51]. One month after the experimental period, leaf curling and drying in the tips were observed in both species under both light treatments.…”

Effect of Light Quality on Metabolomic, Ionomic, and Transcriptomic Profiles in Tomato Fruit

“…Flowering is regulated by light quality; moreover, blue, red, and far-red wavelengths play crucial roles in plant photomorphogenesis and anthesis in Arabidopsis and horticultural plants [ 10 ]. Blue and far-red light promote flowering in Arabidopsis and Eustoma [ 11 , 12 ]. In addition to flowering, light quality can influence plant growth and metabolite accumulation in leafy vegetables [ 13 ].…”