Abstract
Although green light is sometimes neglected, it can have several effects on plant growth and development. Green light is probably sensed by cryptochromes (crys), one of the blue light photoreceptor families. The aim of this study is to investigate the possible interaction between green and blue light and the involvement of crys in the green light response of plant photomorphogenesis. We hypothesize that green light effects on morphology only occur when crys are activated by the presence of blue light. Wild‐type Moneymaker (MM), cry1a mutant (cry1a), and two CRY2 overexpressing transgenic lines (CRY2‐OX3 and CRY2‐OX8) of tomato (Solanum lycopersicum) were grown in a climate chamber without or with green light (30 μmol m−2 s−1) on backgrounds of sole red, sole blue and red/blue mixture, with all treatments having the same photosynthetic photon flux density of 150 μmol m−2 s−1. Green light showed no significant effects on biomass accumulation, nor on leaf characteristics such as leaf area, specific leaf area, and chlorophyll content. However, in all genotypes, green light significantly decreased stem length on a sole blue background, whereas green light hardly affected stem length on sole red and red/blue mixture background. MM, cry1a, and CRY2‐OX3/8 plants all exhibited similar responses of stem elongation to green light, indicating that cry1a, and probably cry2, is not involved in this green light effect. We conclude that partially replacing blue light by green light reduces elongation and that this is independent of cry1a.
Highlights
Leaves reflect a relatively large part of green light (G), causing the green appearance of plants
The aim of this study is to investigate the interaction between G and B and the involvement of crys in the green light response of plant photomorphogenesis
In contrast with MM and cry1a mutant, stem length was reduced in CRY2-OX3 and CRY2-OX8 when partly replacing sole R by G (Figure 2), while partly replacing B by G induced a lower shoot: root ratio and smaller leaf area. These results indicate the involvement of CRY2 in green light effects on stem length, shoot: root ratio and leaf area
Summary
Leaves reflect a relatively large part of green light (G), causing the green appearance of plants. The fraction of green light that is reflected is only about 10–15% (Paradiso et al 2011; Smith 1986), while the major share (about 75–80%) is absorbed, and the rest transmitted This suggests that there might very well be a role of green light in photomorphogenesis. It has been suggested that green light reverses the action of blue light on the activity of crys, making them inactive for blue light (Banerjee et al 2007; Bouly et al 2007). The aim of this study is to investigate the interaction between G and B and the involvement of crys in the green light response of plant photomorphogenesis. In contrast to many other studies on G, we kept the PPFD as well as the ratio of other colors the same when G was added
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