Abstract
Background and Aims In southern China, where the solar radiation is insufficient for optimised grapevine growth, supplemental light sources are being used. The aim of the present study was to assess the practicability of light-emitting diode (LED) light as a supplemental light source to improve grape photosynthesis and berry composition. Methods and Results The leaf abaxial surface (Ab) of cv. Summer Black grapevines was illuminated by red, blue and compound LED light strips. In most cases, the net photosynthetic rate (Pn) of the light-treated plants was typically higher than that of the untreated Control (CK) on sunny and rainy days in all stages. Blue light promoted the Pn of the leaf adaxial surface (Ad), whereas red light promoted the Pn of Ab, and the effect of compound light was moderate. The light response curve on the Ad showed that blue and compound light can facilitate the use of high light by the grape leaf. The CO2 response curve indicated that leaves supplemented with blue light have a significantly advantageous CO2 assimilation. Grapes supplemented with compound and red light had a berry mass higher than that of the Control, whereas grapes supplemented with blue and compound light had improved berry composition. Conclusions Blue and compound LED irradiation increased leaf photosynthetic capacity and improved fruit composition, whereas red and compound LED irradiation increased berry mass. Significance of the Study The supplemental LED lights significantly optimised the light environment and improved photosynthesis and the composition of grape in southern China.
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Claims 7
Claim · model-written summary
light-treated plants improved net photosynthetic rate (Pn).
Verbatim
e0“In most cases, the net photosynthetic rate (Pn) of the light-treated plants was typically higher than that of the untreated Control (CK) on sunny and rainy days in all stages.”
t0“grape”
Claim · model-written summary
Blue light improved Pn of the leaf adaxial surface (Ad).
Not reportedComparator
Verbatim
e0“Blue light promoted the Pn of the leaf adaxial surface (Ad), whereas red light promoted the Pn of Ab, and the effect of compound light was moderate.”
t0“grape”
Claim · model-written summary
red light improved Pn of Ab.
Not reportedComparator
Verbatim
e0“Blue light promoted the Pn of the leaf adaxial surface (Ad), whereas red light promoted the Pn of Ab, and the effect of compound light was moderate.”
t0“grape”
Claim · model-written summary
blue and compound light improved use of high light.
Not reportedComparator
Verbatim
e0“The light response curve on the Ad showed that blue and compound light can facilitate the use of high light by the grape leaf.”
t0“grape”
Claim · model-written summary
blue light improved CO2 assimilation.
Not reportedComparator
Verbatim
e0“The CO2 response curve indicated that leaves supplemented with blue light have a significantly advantageous CO2 assimilation.”
t0“grape”
Claim · model-written summary
compound and red light improved berry mass.
Verbatim
e0“Grapes supplemented with compound and red light had a berry mass higher than that of the Control, whereas grapes supplemented with blue and compound light had improved berry composition.”
t0“grape”
Claim · model-written summary
blue and compound light improved berry composition.
Not reportedComparator
Verbatim
e0“Grapes supplemented with compound and red light had a berry mass higher than that of the Control, whereas grapes supplemented with blue and compound light had improved berry composition.”
t0“grape”
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