Influence of Canopy Film-covering on Photosynthesis and Fruit Quality of Citrus reticulata ‘Shiyueju’

doi:10.11924/j.issn.1000-6850.casb2020-0478

Abstract

Abstract:

To study the influence of the canopy film-covering on canopy environment, photosynthesis and fruit quality in Citrus reticulata ‘Shiyueju’, the temperature, humidity, and light intensity in the canopy of both the trees with (treatment) or without (control) canopy film-covering were measured, as well as the leaf photosynthetic parameters including net photosynthetic rate, stomatal conductance, transpiration rate, intercellular carbon dioxide and etc., likewise, the contents of total soluble solids(TSS), total sugar (TS), titratable acid (TA) and vitamin C (Vc) in fruits were also measured. Compared with the control, the light intensity and humidity was generally decreased in daytime under canopy film-covering and the decrease was from 36.36% to 63.64% and 5.25% to 7.56%, respectively; the monthly average temperature and diurnal temperature variation of the canopy film-covering trees were increased and the maximum increase was 1.21℃ and 3.88℃, respectively; the net photosynthetic rate of the trees with canopy film-covering was decreased and the maximum decrease was 45.95%; the canopy film-covering trees had a significant higher total soluble solids(TSS), total sugar (TS) and TS/TA and the increase was 7.81%, 23.46% and 4.87%, respectively. Canopy film-covering could maintain better fruit quality and prolong the harvest time of C. reticulata ‘Shiyueju’.

Key words: Citrus reticulata ‘Shiyueju’, photosynthetic characters, fruit quality, canopy film-covering, temperature and humidity, light intensity

CLC Number:

S666.2

Fan Qijun, Chen Chuanwu, Liu Ping, Niu Ying, Tang Yan, Deng Chongling. Influence of Canopy Film-covering on Photosynthesis and Fruit Quality of Citrus reticulata ‘Shiyueju’[J]. Chinese Agricultural Science Bulletin, 2021, 37(22): 57-62.

Figures/Tables 9

References 25

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月份	月均温度/℃		月均湿度/%		月均光照强度/lx		月均昼夜温差/℃
月份	对照	覆膜	对照	覆膜	对照	覆膜	对照	覆膜
2017年12月	9.78±0.75	10.63±0.71	79.04±2.04	77.61±1.97	1382±140	914±40^*	12.03±1.42	14.78±1.74^*
2018年1月	9.12±0.78	9.74±0.78	81.80±1.16	80.49±1.20	904±70	570±60^*	6.61±0.79	8.16±0.97^*
2018年2月	11.37±0.82	12.35±0.84^*	73.16±2.05	71.64±2.07	1390±70	1020±30^*	9.32±0.83	11.48±1.03^*
2018年3月	16.91±0.61	18.12±0.56^*	78.48±1.11	76.36±1.14^*	1948±570	1494±140^*	11.64±1.09	15.52±1.33^*

月份	月均温度/℃		月均湿度/%		月均光照强度/lx		月均昼夜温差/℃
月份	对照	覆膜	对照	覆膜	对照	覆膜	对照	覆膜
2017年12月	9.78±0.75	10.63±0.71	79.04±2.04	77.61±1.97	1382±140	914±40^*	12.03±1.42	14.78±1.74^*
2018年1月	9.12±0.78	9.74±0.78	81.80±1.16	80.49±1.20	904±70	570±60^*	6.61±0.79	8.16±0.97^*
2018年2月	11.37±0.82	12.35±0.84^*	73.16±2.05	71.64±2.07	1390±70	1020±30^*	9.32±0.83	11.48±1.03^*
2018年3月	16.91±0.61	18.12±0.56^*	78.48±1.11	76.36±1.14^*	1948±570	1494±140^*	11.64±1.09	15.52±1.33^*

处理	可溶性固形物/%	总糖/%	还原糖/%	蔗糖/%	可滴定酸/%	维生素C/(mg/100 mL)	固酸比	糖酸比
覆膜	13.80±0.23	12.84±0.06	4.38±0.01	8.09±0.41	0.51±0.01	16.50±0.51	27.11±1.07	25.20±0.46
对照	12.80±0.29^*	10.40±0.12^*	4.23±0.01	7.64±0.28	0.43±0.01^*	18.36±0.54	29.59±1.25^*	24.03±0.75^*

处理	可溶性固形物/%	总糖/%	还原糖/%	蔗糖/%	可滴定酸/%	维生素C/(mg/100 mL)	固酸比	糖酸比
覆膜	13.80±0.23	12.84±0.06	4.38±0.01	8.09±0.41	0.51±0.01	16.50±0.51	27.11±1.07	25.20±0.46
对照	12.80±0.29^*	10.40±0.12^*	4.23±0.01	7.64±0.28	0.43±0.01^*	18.36±0.54	29.59±1.25^*	24.03±0.75^*