Effects of Spectral Matching-based Light Conversion Greenhouse Films on Growth and Fruit Quality of Capsicum annuum

doi:10.16420/j.issn.0513-353x.2022-1003

Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (12): 2653-2664.doi: 10.16420/j.issn.0513-353x.2022-1003

• Cultivation Physiology & Biochemistry • Previous Articles Next Articles

Effects of Spectral Matching-based Light Conversion Greenhouse Films on Growth and Fruit Quality of Capsicum annuum

GAO Jinhui¹, ZHANG Danqiu¹, LIAN Shixun², WANG Chuanqing¹, WEI Min¹, MI Qinghua³, LI Yan¹^,^*()

¹ College of Horticultural Science and Engineering，Shandong Agricultural University，Tai'an，Shandong 271018，China
² School of Chemical Engineering，Hunan Normal University，Changsha 410081，China
³ Key Laboratory of Agricultural Film Application of Ministry of Agriculture and Rural Affairs，Tai'an，Shandong 271018，China

Received:2023-09-28 Revised:2023-12-10 Online:2023-12-25 Published:2023-12-29
Contact: LI Yan

Abstract

Abstract:

In order to screen special greenhouse films suitable for the protected cultivation of sweet pepper，the coating-anti-fog ethylene vinyl acetate copolymer（EVA）colorless greenhouse films with the addition of light conversion agents of GTR650 and VTR660，respectively，were applied with the red sweet pepper variety of‘Kaitelin'as plant material in this study. This type of EVA greenhouse film without light conversion agent was used as control. Then，the fluorescence spectrum and mechanical properties of different light conversion greenhouse films and the light conversion characteristics under solar greenhouse when covered by these films as well as their effects on the growth，fruit yield and main quality of sweet pepper were studied. The results showed that the films with the addition of GTR650 and VTR660 were excited by 520 nm of green light and 335 nm of ultraviolet light，and then，produced red light emission peaks at 645 nm and 654 nm，respectively. Compared with control，the light conversion greenhouse films of GTR650 and VTR660 could significantly improve the transmittance of red-orange and far-red light under solar greenhouse，and it was found to be higher under film of VTR660 than that of GTR650. However，the transmittance of violet and green light was significantly reduced under light conversion greenhouse films，among which，the transmittance of violet light under VTR660 film and green light under GTR650 film was the lowest. In addition，compared with control，the mechanical strength of the light conversion greenhouse films was significantly higher，while the light transmittance was significantly lower. Moreover，the vertical and horizontal tensile strength and elongation at break of VTR660 film was increased by 4.9%，10.4% and 11.2%，11.5%，relative to control，respectively. The stem diameter，leaf numbers，net photosynthetic rate，fruit yield and content of vitamin C，total phenols，anthocyanins，total sugar，starch and glucose of sweet pepper under VTR660 film were significantly higher than those of control and GTR650 film，and the yield and anthocyanin content of sweet pepper fruit under VTR660 film was increased by 8.1% and 40.8% relative to control，separately. Covering this greenhouse film could evidently enhance the activities of penylalaninelyase，chalcone isomerase，dihydroflavonol reductase，anthocyanin synthase，sucrose synthase，sucrose phosphate synthase，neutral invertase，acid invertase and β-amylase in sweet pepper fruit. In summary，in the present study，the emission spectrum of EVA greenhouse film added by light conversion agent of VTR660 could match well with the photosynthetic absorption spectrum of sweet pepper，and optimize the light environment under solar greenhouse by converting the transmitted light qualities，namely by enhancing the transmittance of red-orange and far-red light. This was conducive to the plant growth of sweet pepper and promoted the anthocyanin and sugar metabolism in fruit，subsequently improved the fruit quality.

Key words: sweet pepper, protected cultivation, light conversion greenhouse film, spectrum, transmittance, growth, fruit quality

GAO Jinhui, ZHANG Danqiu, LIAN Shixun, WANG Chuanqing, WEI Min, MI Qinghua, LI Yan. Effects of Spectral Matching-based Light Conversion Greenhouse Films on Growth and Fruit Quality of Capsicum annuum[J]. Acta Horticulturae Sinica, 2023, 50(12): 2653-2664.

Figures/Tables 12

References 44

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处理 Treatment	400 ~ 440 nm 紫光Violet	440 ~ 510 nm 蓝光Blue	510 ~ 610 nm 绿光Green	610 ~ 710 nm 红橙光Red	710 ~ 760 nm 远红光Far-red	透光率 Transmittance
对照Control	8.98 ± 0.03 a	20.45 ± 0.10 a	30.10 ± 0.02 a	27.31 ± 0.02 c	11.88 ± 0.10 c	83.87 ± 0.89 a
GTR650	8.89 ± 0.02 b	20.45 ± 0.09 a	29.45 ± 0.01 c	28.60 ± 0.10 b	12.12 ± 0.05 b	78.01 ± 1.51 c
VTR660	8.05 ± 0.01 c	20.45 ± 0.09 a	29.82 ± 0.02 b	29.19 ± 0.08 a	12.47 ± 0.07 a	81.10 ± 1.17 b

处理 Treatment	400 ~ 440 nm 紫光Violet	440 ~ 510 nm 蓝光Blue	510 ~ 610 nm 绿光Green	610 ~ 710 nm 红橙光Red	710 ~ 760 nm 远红光Far-red	透光率 Transmittance
对照Control	8.98 ± 0.03 a	20.45 ± 0.10 a	30.10 ± 0.02 a	27.31 ± 0.02 c	11.88 ± 0.10 c	83.87 ± 0.89 a
GTR650	8.89 ± 0.02 b	20.45 ± 0.09 a	29.45 ± 0.01 c	28.60 ± 0.10 b	12.12 ± 0.05 b	78.01 ± 1.51 c
VTR660	8.05 ± 0.01 c	20.45 ± 0.09 a	29.82 ± 0.02 b	29.19 ± 0.08 a	12.47 ± 0.07 a	81.10 ± 1.17 b

处理 Treatment	雾度/% Haze	拉伸强度/MPa Tensile strength		断裂伸长率/% Elongation at break		直角撕裂强度/（kN · m^-1） Right angle tear resistance
处理 Treatment	雾度/% Haze	纵向 Vertical	横向 Horizontal	纵向 Vertical	横向 Horizontal	纵向 Vertical	横向 Horizontal
对照 Control	15.90 ± 0.16 b	30.70 ± 0.14 b	33.50 ± 0.21 c	644.20 ± 5.28 c	703.60 ± 6.41 c	93.80 ± 1.08 c	110.40 ± 1.35 c
GTR650	16.80 ± 0.12 a	31.80 ± 0.18 a	35.80 ± 0.24 b	687.00 ± 3.88 b	723.40 ± 4.63 b	103.20 ± 1.36 a	118.60 ± 1.71 a
VTR660	16.20 ± 0.17 b	32.20 ± 0.20 a	37.00 ± 0.26 a	716.30 ± 5.86 a	784.30 ± 7.26 a	97.20 ± 1.12 b	115.40 ± 1.24 b

处理 Treatment	雾度/% Haze	拉伸强度/MPa Tensile strength		断裂伸长率/% Elongation at break		直角撕裂强度/（kN · m^-1） Right angle tear resistance
处理 Treatment	雾度/% Haze	纵向 Vertical	横向 Horizontal	纵向 Vertical	横向 Horizontal	纵向 Vertical	横向 Horizontal
对照 Control	15.90 ± 0.16 b	30.70 ± 0.14 b	33.50 ± 0.21 c	644.20 ± 5.28 c	703.60 ± 6.41 c	93.80 ± 1.08 c	110.40 ± 1.35 c
GTR650	16.80 ± 0.12 a	31.80 ± 0.18 a	35.80 ± 0.24 b	687.00 ± 3.88 b	723.40 ± 4.63 b	103.20 ± 1.36 a	118.60 ± 1.71 a
VTR660	16.20 ± 0.17 b	32.20 ± 0.20 a	37.00 ± 0.26 a	716.30 ± 5.86 a	784.30 ± 7.26 a	97.20 ± 1.12 b	115.40 ± 1.24 b

处理 Treatment	株高/cm Plant height	茎粗/mm Stem diameter	节间长度/cm Internode length	叶片数 Leaf number
对照Control	101.00 ± 1.78 a	11.07 ± 0.82 c	3.20 ± 0.05 b	97.71 ± 1.20 c
GTR650	101.67 ± 1.24 a	11.60 ± 0.63 b	3.43 ± 0.04 a	104.06 ± 1.31 b
VTR660	101.33 ± 1.53 a	11.77 ± 0.47 a	3.33 ± 0.07 ab	110.00 ± 1.42 a

Effects of Spectral Matching-based Light Conversion Greenhouse Films on Growth and Fruit Quality of Capsicum annuum

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处理 Treatment	净光合速率/ （μmol · m^-2· s^-1） Net photosynthetic rate	叶绿素a/ （mg · g^-1 FW） Chlorophyll a	叶绿素b/ （mg · g^-1FW） Chlorophyll b	叶绿素（a + b）/ （mg · g^-1FW） Chlorophyll a+b	叶绿素a/b Chlorophyll a/b
对照Control	10.18 ± 0.17 c	1.19 ± 0.02 b	0.29 ± 0.06 b	1.48 ± 0.07 b	4.25 ± 0.93 a
GTR650	12.25 ± 0.49 b	1.32 ± 0.09 a	0.35 ± 0.08 a	1.66 ± 0.02 a	3.92 ± 0.49 b
VTR660	13.03 ± 0.24 a	1.31 ± 0.07 a	0.34 ± 0.05 a	1.64 ± 0.04 a	4.27 ± 0.83 a

处理 Treatment	转色率/% Color conversion rate	单株果数 Number of fruit per plant	平均单果质量/g Average single fruit weight	产量/（kg · hm^-2） Yield	比对照/% Compared with control
对照Control	14.01 ± 0.12 c	7.33 ± 0.09 c	190.90 ± 0.16 a	210.54 ± 0.17 b	—
GTR650	15.52 ± 0.13 b	9.50 ± 0.08 b	146.49 ± 0.17 b	209.39 ± 0.16 b	-0.54
VTR660	16.52 ± 0.08 a	9.58 ± 0.09 a	157.83 ± 0.15 c	227.50 ± 0.14 a	+ 8.06

处理 Treatment	有机酸/% Organic acid	维生素C/（mg · g^-1） Vitamin C	可溶性蛋白/（mg · g^-1） Soluble protein	总酚/（U · g^-1 FW） Total phenol
对照Control	2.58 ± 0.01 a	0.546 ± 0.12 c	1.63 ± 0.08 b	7.38 ± 1.00 c
GTR650	2.58 ± 0.02 a	0.784 ± 0.14 b	1.68 ± 0.15 ab	8.45 ± 0.21 b
VTR660	2.41 ± 0.02 a	0.814 ± 0.13 a	2.02 ± 0.09 a	10.00 ± 0.40 a

处理 Treatment	花青苷含量 Anthocyanin content	苯丙氨酸裂解酶 Penylalanine lyase	查尔酮异构酶 Chalcone isomerase	二羟黄酮醇还原酶 Dihydroxy flavonol reductase	花青苷合成酶 Anthocyanin synthase
对照Control	1.84 ± 0.11 b	7.23 ± 0.41 b	10.69 ± 0.22 b	5.71 ± 0.12 c	31.65 ± 0.27 c
GTR650	1.94 ± 0.09 b	8.20 ± 0.61 a	11.57 ± 0.21 a	9.42 ± 0.47 b	35.65 ± 0.44 b
VTR660	2.59 ± 0.16 a	8.28 ± 0.35 a	11.92 ± 0.30 a	12.48 ± 0.81 a	39.38 ± 1.35 a

处理 Treatment	总糖 Total sugar	淀粉 Starch	葡萄糖 Glucose	果糖 Fructose	蔗糖 Sucrose
对照Control	17.04 ± 0.09 c	4.10 ± 0.02 b	2.15 ± 0.04 c	3.26 ± 0.04 b	0.04 ± 0.01 b
GTR650	17.75 ± 0.22 b	4.17 ± 0.02 b	2.28 ± 0.01 b	3.56 ± 0.03 a	0.05 ± 0.01 ab
VTR660	18.92 ± 0.19 a	5.36 ± 0.02 a	2.39 ± 0.07 a	3.62 ± 0.02 a	0.06 ± 0.01 a

处理 Treatment	蔗糖合成酶 Sucrose synthetase	蔗糖磷酸合成酶 Sucrose phosphate synthase	酸性转化酶 Acid invertase	中性转化酶 Neutral invertase	α-淀粉酶 α-Amylase	β-淀粉酶 β-Amylase
对照Control	0.12 ± 0.01 c	0.28 ± 0.01 b	1.39 ± 0.06 c	1.35 ± 0.03 c	33.29 ± 2.09 a	7.37 ± 1.28 b
GTR650	0.14 ± 0.01 b	0.32 ± 0.03 a	1.64 ± 0.13 b	1.65 ± 0.06 b	30.64 ± 3.35 a	9.58 ± 0.68 a
VTR660	0.18 ± 0.01 a	0.37 ± 0.05 a	2.02 ± 0.09 a	2.10 ± 0.07 a	34.47 ± 2.46 a	10.02 ± 0.68 a

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