Far-red signaling affects the regulation of photosynthesis in tomatoes

TY - GEN

T1 - Far-red signaling affects the regulation of photosynthesis in tomatoes

AU - Shomali, A.

AU - Ottosen, C. O.

AU - Zhou, R.

AU - Aliniaeifard, S.

AU - Abdelhakim, L.

N1 - Conference code: 9

PY - 2024/3

Y1 - 2024/3

N2 - The cut edge of photosynthesis active radiation is set at 700 nm, as wavelengths above this are not efficient for photosynthesis. However, shorter wavelengths can improve the efficiency of higher wavelengths through wavelength synergy, known as the “Emerson enhancement effect”. This study hypothesizes that while far-red is not efficient in deriving photosynthesis, its signaling properties can impact photosynthesis efficiency. Additionally, the intensity of background light can modify these effects. In this study, plants were exposed to low (250 µmol m-2 s-1) and high (650 µmol m-2 s-1) intensity white light with or without additional far-red (60 µmol m-2 s-1). Results show that the light compensation point was increased by high light only in mutants of phytochrome B1 and phytochrome B2. Additionally, low light + far-red increased the light compensation point of phytochrome A mutants but had a drastic decline in other genotypes. Light compensation point was decreased by high light + far-red irrespective of genotype, suggesting that it depends on both light intensity and signaling. Dark respiration was affected by high light in mutants compared to low light, but not in the wild type. Non-photochemical quenching was increased by high light and far-red only reduced that of phytochrome A mutants. The study concludes that both the energy and signaling aspects of far-red affect photosynthesis and that background light intensity can modify the impact of far-red signaling and energy on photosynthesis.

AB - The cut edge of photosynthesis active radiation is set at 700 nm, as wavelengths above this are not efficient for photosynthesis. However, shorter wavelengths can improve the efficiency of higher wavelengths through wavelength synergy, known as the “Emerson enhancement effect”. This study hypothesizes that while far-red is not efficient in deriving photosynthesis, its signaling properties can impact photosynthesis efficiency. Additionally, the intensity of background light can modify these effects. In this study, plants were exposed to low (250 µmol m-2 s-1) and high (650 µmol m-2 s-1) intensity white light with or without additional far-red (60 µmol m-2 s-1). Results show that the light compensation point was increased by high light only in mutants of phytochrome B1 and phytochrome B2. Additionally, low light + far-red increased the light compensation point of phytochrome A mutants but had a drastic decline in other genotypes. Light compensation point was decreased by high light + far-red irrespective of genotype, suggesting that it depends on both light intensity and signaling. Dark respiration was affected by high light in mutants compared to low light, but not in the wild type. Non-photochemical quenching was increased by high light and far-red only reduced that of phytochrome A mutants. The study concludes that both the energy and signaling aspects of far-red affect photosynthesis and that background light intensity can modify the impact of far-red signaling and energy on photosynthesis.

KW - energy balance

KW - light compensation point

KW - spectral composition

KW - wavelength synergy

UR - http://www.scopus.com/inward/record.url?scp=85193323979&partnerID=8YFLogxK

U2 - 10.17660/ActaHortic.2024.1391.26

DO - 10.17660/ActaHortic.2024.1391.26

M3 - Article in proceedings

AN - SCOPUS:85193323979

SN - 978-94-62613-90-4

T3 - Acta Horticulturae

SP - 191

EP - 196

BT - IX South-Eastern Europe Symposium on Vegetables and Potatoes

A2 - Bogoescu, M.I.

A2 - Gruda, N.S.

A2 - Lagunovschi , V.L.

PB - International Society for Horticultural Science, ISHS

CY - Bucharest

T2 - IX South-Eastern Europe Symposium on Vegetables and Potatoes

Y2 - 5 September 2023 through 9 September 2023

ER -