Crops ›› 2024, Vol. 40 ›› Issue (2): 172-177.doi: 10.16035/j.issn.1001-7283.2024.02.021

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Effects of Different Light Intensity on Photosynthetic Characteristics and Flowering of Sweet Potato

Du Qingfu1(), Shang Lili1(), Lü Jiahao2, Zhang Ruiqing1, Yao Jiangang1, Qiu Pengfei1, Zhao Jianwei1, He Shaozhen2()   

  1. 1Yantai Academy of Agricultural Sciences, Yantai 265500, Shandong, China
    2Key Laboratory of Sweet Potato Biology and Biotechnology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100193, China
  • Received:2023-02-14 Revised:2023-03-03 Online:2024-04-15 Published:2024-04-15

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Abstract:

Sweet potato is a short-day plant, which is unable to flower spontaneously in most areas of north China. In order to explore the suitable light conditions for sweet potato flowering, Longshu 9, Yanshu 29, Yanshu 24, Yanshu 25 and Yanshu 26 were used as materials to study the effects of different light intensities on the growth and flowering of sweet potato under the conditions of grafting and short-day treatment, with weak light treatment (25% full light) and natural light treatment (full light). The results showed that weak light had a greater impact on the growth, bud emergence and flowering of five sweet potato varieties. Weak light promoted the vegetative growth of Yanshu 24, Yanshu 25 and Yanshu 26, and inhibited the vegetative growth of Yanshu 29; The decrease of light intensity significantly reduced the number of flowering of easy-flowering sweet potato varieties. The number of flowering of Longshu 9, Yanshu 29 and Yanshu 24 decreased by 54.2%, 66.5% and 64.5%, respectively. The maximum light absorption rate, stomatal conductance and transpiration rate of the five varieties treated with low light were all reduced by more than 50.0%, 20.3%-25.0% and 18.8%-22.6%, respectively. This study showed that 8 h short day natural light intensity condition is more conducive to the grafting sweet potato flowering.

Key words: Sweet potato, Light intensity, Flowering, Photosynthetic characteristics

Table 1

Effects of low light on growth and flowering of sweet potato plants"

光照强度Illumination intensity 品种Variety 株高Plant height (cm) 花蕾数Bud number 开花数Number of blooms
自然光Natural light 龙薯9号 266.90±11.94fE 182.33±5.70aA 707.00±11.48bB
烟薯29号 279.10±10.02efE 106.00±2.26bB 931.00±38.92aA
烟薯24号 226.20±9.91gF 45.67±1.73dD 232.67±15.69dD
烟薯25号 339.53±18.39dD 6.00±1.13ghGH 32.67±1.31fF
烟薯26号 388.77±22.56cC 2.67±0.65hH 0.00±0.00gG
弱光Low light 龙薯9号 279.00±12.37efE 104.67±0.65bB 324.00±7.92cC
烟薯29号 226.43±3.45gF 53.33±1.31cC 311.67±11.56cC
烟薯24号 292.03±12.43eE 33.67±1.31eE 82.67±1.73eE
烟薯25号 683.87±22.60aA 8.67±1.73gG 13.67±0.65fgFG
烟薯26号 419.30±4.22bB 16.33±0.65fF 0.00±0.00gG

Fig.1

Variation curve of the Pn of different sweet potato varieties with light intensity"

Table 2

Differences of photosynthetic parameters of different sweet potato varieties μmol/(m2·s)"

品种
Variety		 最大Pn
Maximum Pn		 暗呼吸速率
Dark respiration rate		 表观量子效率
Apparent quantum yield		 光补偿点
Light compensation point		 光饱和点
Light saturation point
龙薯9号Longshu 9 24cC 3.14cABC 0.031cBC 104.02aAB 1110abA
烟薯29号Yanshu 29 27bB 4.18aA 0.036bABC 119.00aA 1280aA
烟薯24号Yanshu 24 19eD 2.42dBC 0.029cC 86.05bBC 1202aA
烟薯25号Yanshu 25 29aA 3.31bAB 0.042aA 79.23bCD 967bA
烟薯26号Yanshu 26 21dD 2.10eC 0.037abAB 56.91cD 846bA

Fig.2

Diurnal variation of Pn of different sweat potato varieties"

Fig.3

Diurnal variation of Gs of different sweat potato varieties"

Fig.4

Diurnal variation of Tr of different sweat potato varieties"

Fig.5

Diurnal variation of Ci of different sweat potato varieties"

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