Effects of LED Light Intensity on Purple Leaf Lettuce Seedlings

doi:10.11924/j.issn.1000-6850.casb2022-0305

Abstract

Abstract:

To explore the light intensity suitable for the growth of purple leaf lettuce seedlings in plant factories and greenhouses, the effects of light intensity of 6000, 12000, 18000, 24000 and 30000 lx on growth morphology, nutritional quality, photosynthetic pigment and photosynthetic characteristics of purple leaf lettuce seedlings were studied with ‘Beizisheng 3’ as the experimental material under the condition of white light quality unchanged. The results showed that under the light intensity of 30000 lx, purple leaf lettuce seedlings grew well and the biomass, chlorophyll a content, chlorophyll b content, carotenoid content, total chlorophyll, soluble protein content, soluble sugar content, vitamin C content, anthocyanin content, net photosynthetic rate, transpiration rate and stomatal conductance were the largest, while the nitrate content and intercellular CO₂ concentration were the lowest. However, chlorophyll b content, carotenoid content, soluble protein content and transpiration rate had no significant difference compared with those under 24000 lx light intensity, and the plant height was the highest under 24000 lx light intensity. Under the condition of white light quality, the most suitable light intensity for the growth of purple leaf lettuce seedlings is 30000 lx.

Key words: light intensity, purple leaf lettuce seedlings, growth morphology, nutritional quality, photosynthetic pigment, photosynthetic characteristics

DAI Lvye, ZHANG Xin, TENG Yingzi, GU Yiyin, CHEN Li, KONG Xiaoping, HAN Yingyan. Effects of LED Light Intensity on Purple Leaf Lettuce Seedlings[J]. Chinese Agricultural Science Bulletin, 2023, 39(10): 24-30.

Figures/Tables 6

References 25

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生长指标	T1	T2	T3	T4	T5
株高/cm	4.07±0.06cd	4.43±0.31c	3.83±0.06d	7.70±0.35a	6.27±0.06b
展幅/cm	8.17±0.06d	8.47±0.12d	9.27±0.15c	14.47±0.06b	15.70±0.56a
茎粗/mm	1.83±0.29c	1.88±0.11c	2.17±0.29c	3.33±0.58b	4.33±0.58a
叶柄长/cm	1.13±0.29b	1.47±0.06a	0.97±0.15b	1.23±0.12ab	0.67±0.06c
叶长/cm	4.20±0.10d	4.47±0.15d	5.00±0.10c	7.40±0.20b	7.87±0.21a
叶宽/cm	2.23±0.12e	2.53±0.15d	3.40±0.20c	6.13±0.06b	6.40±0.10a
叶面积/cm²	6.57±0.38d	7.93±0.52d	11.92±0.84c	31.80±0.62b	35.28±1.19a
叶片数/张	4.00±0.00c	4.00±0.00c	5.00±0.00b	8.00±0.00a	8.33±0.58a
根系长度/cm	9.23±1.36d	9.60±0.52d	11.13±0.76c	15.20±0.70b	18.33±0.58a

生长指标	T1	T2	T3	T4	T5
株高/cm	4.07±0.06cd	4.43±0.31c	3.83±0.06d	7.70±0.35a	6.27±0.06b
展幅/cm	8.17±0.06d	8.47±0.12d	9.27±0.15c	14.47±0.06b	15.70±0.56a
茎粗/mm	1.83±0.29c	1.88±0.11c	2.17±0.29c	3.33±0.58b	4.33±0.58a
叶柄长/cm	1.13±0.29b	1.47±0.06a	0.97±0.15b	1.23±0.12ab	0.67±0.06c
叶长/cm	4.20±0.10d	4.47±0.15d	5.00±0.10c	7.40±0.20b	7.87±0.21a
叶宽/cm	2.23±0.12e	2.53±0.15d	3.40±0.20c	6.13±0.06b	6.40±0.10a
叶面积/cm²	6.57±0.38d	7.93±0.52d	11.92±0.84c	31.80±0.62b	35.28±1.19a
叶片数/张	4.00±0.00c	4.00±0.00c	5.00±0.00b	8.00±0.00a	8.33±0.58a
根系长度/cm	9.23±1.36d	9.60±0.52d	11.13±0.76c	15.20±0.70b	18.33±0.58a

生物量指标	T1	T2	T3	T4	T5
地上部鲜重/g	0.30±0.05c	0.44±0.11c	0.60±0.06c	4.48±0.61b	5.76±0.86 a
地下部鲜重/g	0.02±0.01b	0.03±0.02b	0.05±0.01b	0.36±0.15b	1.39±0.40a
地上部干重/mg	15.77±0.45d	16.47±0.06d	30.13±0.12c	257.40±0.20b	336.53±0.91a
地下部干重/mg	2.40±0.10e	3.37±0.23d	5.83±0.29c	25.60±0.50b	81.87±0.32a
根冠比（鲜重）	0.06±0.02b	0.08±0.02b	0.08±0.01b	0.08±0.02b	0.24±0.06a
壮苗指数	0.01±0.00c	0.01±0.00c	0.03±0.00c	0.15±0.02b	0.39±0.04a

生物量指标	T1	T2	T3	T4	T5
地上部鲜重/g	0.30±0.05c	0.44±0.11c	0.60±0.06c	4.48±0.61b	5.76±0.86 a
地下部鲜重/g	0.02±0.01b	0.03±0.02b	0.05±0.01b	0.36±0.15b	1.39±0.40a
地上部干重/mg	15.77±0.45d	16.47±0.06d	30.13±0.12c	257.40±0.20b	336.53±0.91a
地下部干重/mg	2.40±0.10e	3.37±0.23d	5.83±0.29c	25.60±0.50b	81.87±0.32a
根冠比（鲜重）	0.06±0.02b	0.08±0.02b	0.08±0.01b	0.08±0.02b	0.24±0.06a
壮苗指数	0.01±0.00c	0.01±0.00c	0.03±0.00c	0.15±0.02b	0.39±0.04a

色素	T1	T2	T3	T4	T5
叶绿素a	0.98±0.05d	1.18±0.08c	1.21±0.05c	1.66±0.04b	1.88±0.06a
叶绿素b	0.40±0.00c	0.43±0.05c	0.48±0.02bc	0.54±0.08ab	0.57±0.03a
类胡萝卜素	0.57±0.04c	0.74±0.07b	0.78±0.06b	1.10 ±0.06a	1.21±0.10a
叶绿素总量	1.38±0.05d	1.61±0.12c	1.69±0.06c	2.20±0.12b	2.45±0.06a