Effects of Different Light Quality Treatments on the Growth,Photosynthetic Characteristics and Antioxidant Enzyme Activity of Tomato Seedlings

doi:10.7668/hbnxb.20194442

Abstract

Abstract:

This study was carried out to understand the effect of different light quality treatment on the growth,photosynthesis and antioxidant enzyme activities of tomato seedlings in artificial light plant factory.The trial was conducted at a light intensity of 200 μmol/(m²·s),with blue LED light(B)as control.Green light(G),red light(R),far red light(Fr),or ultraviolet light(UV)with consistent light intensity was added on the basis of blue light to clarify the growth,photosynthetic and antioxidant enzyme activities of tomato seedlings under different light quality combinations.The results showed that compared with control,the height of tomato seedlings under B+Fr treatment was significantly improved,increased by 34.54%.B+R treatment significantly increased the stem diameter and dry and fresh weight of tomato seedlings by 39.27%,25.58% and 22.20%,respectively compared with B.The intercellular CO₂ concentration and stomatal conductance(Gs)of tomato seedlings under B+G treatment were higher than other treatments.Besides,B+R treated seedlings had the highest effective photochemical quantum yield of PS Ⅱ,the actual photochemical quantum yield of PSⅡ and the photochemical quenching coefficient,increased by 4.30%,0.97% and 1.87%,respectively compared with the control.Furthermore,B+G,B+R treatment significantly increased the antioxidant enzymes activity,and significantly decreased the content of malondialdehyde(MDA),reactive oxygen species and hydrogen peroxide in tomato seedlings.Thereinto,MDA content of B+R treated seedlings was 50.64% lower than B treatment,while SOD,POD and APX activities were 15.44%,25.00% and 21.65% higher than B treatment,respectively.Taken together,B+R treatment was not only conducive to the cultivation of strong tomato seedlings,but also helped improving PSⅡ activity of leaves,thus enhancing photosynthetic performance.Meanwhile,B+R light treatment could also maintain a high level of antioxidant enzyme activity in tomato plants and improved the antioxidant capacity of tomato plants.

Key words: Tomato, LED supplementary lighting, Growth, Photosynthesis, Antioxidant enzyme activity

CLC Number:

S641.2

XU Shaonan, LI Ying, YE Lin, CAO Kai, WU Cuinan. Effects of Different Light Quality Treatments on the Growth,Photosynthetic Characteristics and Antioxidant Enzyme Activity of Tomato Seedlings[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(S1): 121-129. doi: 10.7668/hbnxb.20194442.

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References 38

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不同光质处理 Different light quality treatment	株高/cm Plant height	茎粗/mm Stem diameter	叶片数 Number of leaves	叶面积/cm² Leaf area	全株干质量/g Dry weight	全株鲜质量/g Fresh weight
蓝光B	7.99±0.77b	1.91±0.27b	4.60±0.52b	7.16±0.97b	0.43±0.02c	3.83±0.64b
蓝光+绿光B+G	7.37±0.14c	2.53±0.20a	5.10±0.32a	7.51±0.93b	0.50±0.01b	4.61±0.74a
蓝光+红光B+R	6.85±0.41c	2.66±0.39a	4.90±0.32ab	5.73±0.89c	0.54±0.02a	4.68±0.47a
蓝光+远红光B+Fr	10.75±0.93a	0.97±0.21c	4.10±0.32c	8.66±1.61a	0.28±0.02d	2.26±0.32c
蓝光+紫外线B+UV	4.38±0.38d	0.86±0.20c	4.10±0.32c	3.95±0.55d	0.18±0.02e	1.68±0.32d

不同光质处理 Different light quality treatment	株高/cm Plant height	茎粗/mm Stem diameter	叶片数 Number of leaves	叶面积/cm² Leaf area	全株干质量/g Dry weight	全株鲜质量/g Fresh weight
蓝光B	7.99±0.77b	1.91±0.27b	4.60±0.52b	7.16±0.97b	0.43±0.02c	3.83±0.64b
蓝光+绿光B+G	7.37±0.14c	2.53±0.20a	5.10±0.32a	7.51±0.93b	0.50±0.01b	4.61±0.74a
蓝光+红光B+R	6.85±0.41c	2.66±0.39a	4.90±0.32ab	5.73±0.89c	0.54±0.02a	4.68±0.47a
蓝光+远红光B+Fr	10.75±0.93a	0.97±0.21c	4.10±0.32c	8.66±1.61a	0.28±0.02d	2.26±0.32c
蓝光+紫外线B+UV	4.38±0.38d	0.86±0.20c	4.10±0.32c	3.95±0.55d	0.18±0.02e	1.68±0.32d

不同光质处理 Different light quality treatment	PSⅡ最大光化学量子产量Fv/Fm	PSⅡ有效光化学量子产量Fv'/Fm'	实际光化学量子产量PSⅡ	非光化学猝灭 NPQ	光化学猝灭 qP
蓝光B	0.800±0.003b	0.743±0.004a	0.718±0.003a	1.020±0.006a	0.960±0.003a
蓝光+绿光B+G	0.804±0.012ab	0.748±0.015a	0.717±0.008a	1.036±0.020a	0.958±0.011a
蓝光+红光B+R	0.807±0.004ab	0.775±0.014a	0.725±0.005a	1.041±0.011a	0.978±0.017a
蓝光+远红光B+Fr	0.817±0.007a	0.694±0.052b	0.614±0.081b	1.030±0.144a	0.862±0.055b
蓝光+紫外光B+UV	0.805±0.004ab	0.738±0.009ab	0.704±0.010a	1.066±0.022a	0.955±0.010a

不同光质处理 Different light quality treatment	PSⅡ最大光化学量子产量Fv/Fm	PSⅡ有效光化学量子产量Fv'/Fm'	实际光化学量子产量PSⅡ	非光化学猝灭 NPQ	光化学猝灭 qP
蓝光B	0.800±0.003b	0.743±0.004a	0.718±0.003a	1.020±0.006a	0.960±0.003a
蓝光+绿光B+G	0.804±0.012ab	0.748±0.015a	0.717±0.008a	1.036±0.020a	0.958±0.011a
蓝光+红光B+R	0.807±0.004ab	0.775±0.014a	0.725±0.005a	1.041±0.011a	0.978±0.017a
蓝光+远红光B+Fr	0.817±0.007a	0.694±0.052b	0.614±0.081b	1.030±0.144a	0.862±0.055b
蓝光+紫外光B+UV	0.805±0.004ab	0.738±0.009ab	0.704±0.010a	1.066±0.022a	0.955±0.010a

不同光质处理 Different light quality treatment	SOD/ (U/g)	POD/ (U/g)	APX/ (U/g)	MDA/ (mol/g)	H₂O₂/ (μmol/g)	${\mathrm{O}}_{2}^{-}$/ (ng/g)
蓝光B	894.77±51.17c	2.24±0.15b	731.15±24.77b	78.24±4.32c	0.35±0.02b	2 185.45±165.95d
蓝光+绿光B+G	1 165.68±63.33a	2.81±0.12a	879.08±30.76a	75.98±4.75c	0.34±0.02b	2 429.54±141.02c
蓝光+红光B+R	1 032.93±72.04b	2.80±0.12a	889.42±21.50a	38.62±4.74d	0.35±0.02b	2 319.53±174.03cd
蓝光+远红光B+Fr	779.83±60.97d	2.87±0.13a	645.23±23.67c	118.93±3.09a	0.33±0.03b	2 931.47±120.69b
蓝光+紫外光B+UV	779.83±62.60d	1.38±0.13c	616.81±19.91c	113.05±3.43b	0.41±0.03a	3 141.19±106.94a

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