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Light‐induced systemic regulation of photosynthesis in primary and trifoliate leaves of P haseolus vulgaris: effects of photosynthetic photon flux density ( PPFD ) versus spectrum
Author(s) -
Murakami K.,
Matsuda R.,
Fujiwara K.
Publication year - 2014
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12055
Subject(s) - photosynthesis , phaseolus , biology , action spectrum , botany , horticulture , blue light , rubisco , chlorophyll a , photosynthetic efficiency , photon flux , chlorophyll , photon , physics , optics
The objectives of this work using P haseolus vulgaris were to examine whether the light spectrum incident on mature primary leaves ( PL s) is related to leaf‐to‐leaf systemic regulation of developing trifoliate leaves ( TL s) in photosynthetic characteristics, and to investigate the relative importance of spectrum and photosynthetic photon flux density ( PPFD ) in light‐induced systemic regulation. Systemic regulation was induced by altering PPFD and the spectrum of light incident on PL s using a shading treatment and lighting treatments including either white, blue, green or red light‐emitting diodes ( LED s). Photosynthetic characteristics were evaluated by measuring the light‐limited and light‐saturated net photosynthetic rates and the amounts of nitrogen ( N ), chlorophyll ( C hl) and ribulose‐1,5‐bisphosphate carboxylase/oxygenase ( R ubisco; EC 4.1.1.39). Shading treatment on PL s decreased the amounts of N , C hl and R ubisco of TL s and tended to decrease the photosynthetic rates. However, we observed no systemic effects induced by the light spectrum on PL s in this study, except that a higher amount of R ubisco of TL s was observed when the PL s were irradiated with blue LED s. Our results imply that photoreceptors in mature leaves have little influence on photosynthetic rates and amounts of N and C hl of developing leaves through systemic regulation, although the possibility of the action of blue light irradiation on the amount of R ubisco cannot be ruled out. Based on these results, we concluded that the light spectrum incident on mature leaves has little systemic effect on developing leaves in terms of photosynthetic characteristics and that the light‐induced systemic regulation was largely accounted for by PPFD .