Crops ›› 2019, Vol. 35 ›› Issue (5): 114-119.doi: 10.16035/j.issn.1001-7283.2019.05.019

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Effects of Enhanced UV-B on Photosynthetic Characteristics and UV-Absorbing Compounds of Sweet Potato

Meng Fanlai1,2,Guo Huachun1,2   

  1. 1 College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, Yunnan, China
    2 Wenshan Academy of Agricultural Sciences, Wenshan 663000, Yunnan, China
  • Received:2019-02-22 Revised:2019-04-05 Online:2019-10-15 Published:2019-11-07
  • Contact: Huachun Guo

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Abstract:

To explore the effects of UV-B enhancement on photosynthetic characteristics and UV-absorbing compounds contents of sweet potato. Using ‘Huishu’ as the test material and the natural light as a comparison, two treatments were added UV-B 3.6kJ/(m 2·d) (T1) and 7.2kJ/(m 2·d) (T2) on the basis of the natural light, respectively. The photosynthetic pigment contents, photosynthetic parameters and UV-absorbing compounds contents were examined under the different radiations. The results showed that: the contents of chlorophyll a (Chla), chlorophyll b (Chlb), carotenoid (Car) and chlorophyll a/b all decreased with the increase of the UV-B intensity. The Chla, Chlb and Car were the most sensitive to the intensity changes at 100th, 80th and 40th day, respectively. The net photosynthetic rate (Pn) decreased significantly, stomatal conductance (Gs) increased first and then decreased, intercellular carbon dioxide concentration (Ci) and transpiration rate (Tr) showed no obvious variation, while stomatal limitation (Ls) showed an opposite trend with Ci. The UV-absorbing compounds were significantly increased, showing a trend of CK

Key words: UV-B, Sweet potato, Photosynthetic characteristics, UV-absorbing compounds

Fig.1

Photosynthetic pigments contents of sweet potato leaves under enhanced UV-B condition Different lowercase letters indicate significant difference (P<0.05). The same below"

Table 1

Effects of enhanced UV-B on the photosynthetic parameters of sweet potato leaves"

指标Index 处理
Treatment		 处理时间Treatment time (d)
20 40 60 80 100
Pn [μmol CO2/(m2·s)] CK 25.25±1.16a 22.11±1.28a 29.51±2.47a 19.19±1.69a 19.91±1.95a
T1 22.71±1.88b 19.24±0.78b 17.14±1.73b 15.70±0.88b 12.35±0.25b
T2 18.79±1.03c 15.74±1.24c 16.62±1.55b 13.62±1.45b 11.97±1.45b
Gs [mol H2O/(m2·s)] CK 0.45±0.05b 0.74±0.07a 0.35±0.05b 0.27±0.03b 0.19±0.02b
T1 0.39±0.02b 0.77±0.06a 0.46±0.04a 0.32±0.01a 0.11±0.00c
T2 0.62±0.04a 0.50±0.06b 0.32±0.04b 0.28±0.03ab 0.25±0.02a
Ci [mol H2O/mol] CK 266.98±9.81b 321.28±7.10a 226.58±13.19c 253.96±14.11b 228.00±15.71b
T1 253.86±16.02b 320.71±5.31a 298.49±13.23a 280.80±12.78a 200.99±5.69c
T2 320.67±5.58a 310.95±10.47a 275.22±7.18b 286.03±15.08a 305.11±5.29a
Tr [mmol H2O/(m2·s)] CK 11.74±0.58a 8.70±1.20a 9.97±2.05ab 8.82±0.79a 3.86±0.72b
T1 10.02±1.07b 9.24±0.40a 10.74±0.90a 8.73±0.64a 2.39±0.05c
T2 12.35±1.08a 7.43±0.47b 8.11±0.22b 8.41±1.22a 5.68±0.30a
Ls CK 0.29±0.02a 0.16±0.01ab 0.54±0.07a 0.36±0.03a 0.47±0.06b
T1 0.33±0.04a 0.14±0.01b 0.22±0.02b 0.27±0.04b 0.53±0.01a
T2 0.17±0.01b 0.17±0.01a 0.27±0.02b 0.26±0.04b 0.23±0.01c

Fig.2

UV-absorbing compounds contents of sweet potato leaves under enhanced UV-B condition"

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