Effects of partial replacement of red by green light in the growth spectrum on photomorphogenesis and photosynthesis in tomato plants

被引:23
|
作者
Trojak, Magdalena [1 ]
Skowron, Ernest [2 ]
Sobala, Tomasz [2 ]
Kocurek, Maciej [2 ]
Palyga, Jan [1 ]
机构
[1] Jan Kochanowski Univ Humanities & Sci, Dept Med Biol, Uniwersytecka 7, PL-25406 Kielce, Poland
[2] Jan Kochanowski Univ Humanities & Sci, Dept Environm Biol, Uniwersytecka 7, PL-25406 Kielce, Poland
关键词
Green light; Photomorphogenesis; Photosynthesis; Shade-avoidance syndrome; Spectrum optimization; PHOTOCHEMICAL REFLECTANCE INDEX; QUALITY-DEPENDENT REGULATION; BLUE-LIGHT; SOLANUM-LYCOPERSICON; LEAF PHOTOSYNTHESIS; SHADE AVOIDANCE; USE EFFICIENCY; IN-VITRO; PHYTOCHROME; RESPONSES;
D O I
10.1007/s11120-021-00879-3
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The artificial light used in growth chambers is usually devoid of green (G) light, which is considered to be less photosynthetically efficient than blue (B) or red (R) light. To verify the role of G light supplementation in the spectrum, we modified the RB spectrum by progressively replacing R light with an equal amount of G light. The tomato plants were cultivated under 100 mu mol m(-2) s(-1) of five different combinations of R (35-75%) and G light (0-40%) in the presence of a fixed proportion of B light (25%) provided by light-emitting diodes (LEDs). Substituting G light for R altered the plant's morphology and partitioning of biomass. We observed a decrease in the dry biomass of leaves, which was associated with increased biomass accumulation and the length of the roots. Moreover, plants previously grown under the RGB spectrum more efficiently utilized the B light that was applied to assess the effective quantum yield of photosystem II, as well as the G light when estimated with CO2 fixation using RB + G light-response curves. At the same time, the inclusion of G light in the growth spectrum reduced stomatal conductance (g(s)), transpiration (E) and altered stomatal traits, thus improving water-use efficiency. Besides this, the increasing contribution of G light in place of R light in the growth spectrum resulted in the progressive accumulation of phytochrome interacting factor 5, along with a lowered level of chalcone synthase and anthocyanins. However, the plants grown at 40% G light exhibited a decreased net photosynthetic rate (P-n), and consequently, a reduced dry biomass accumulation, accompanied by morphological and molecular traits related to shade-avoidance syndrome.
引用
收藏
页码:295 / 312
页数:18
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