Crops ›› 2017, Vol. 33 ›› Issue (5): 80-84.doi: 10.16035/j.issn.1001-7283.2017.05.014

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Effects of CO2 Enrichment on Growth and Photosynthesis Characteristics of Pepper Seedlings in Greenhouse

Gao Yu,Cui Shimao,Song Yang,Sun Shijun   

  1. Agricultural College,Inner Mongolia Agricultural University,Huhhot 010019,Inner Mongolia,China
  • Received:2017-07-14 Revised:2017-08-11 Online:2017-10-15 Published:2018-08-26
  • Contact: Shimao Cui

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Abstract:

In order to get the suitable CO2 concentration for Pepper cultivation in greenhouse in northern region. The research using “Chaoyan pepper” as the material, explored the effects of CO2 enrichment (350±50)μL/L (CK), (600±50)μL/L (C1), (800±50)μL/L (C2), (1000±50)μL/L (C3) on the growth, SPAD value, and net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate. The results showed that CO2 fertilization significantly increased the plant height and stem diameter, leaf area, leaf SPAD value of the pepper seedlings; and significantly improved the net photosynthetic rate, intercellular CO2 concentration, decreased stomatal conductance and transpiration rate; and the effects of the treatment of CO2 (800±50)μL/L was the most significant.

Key words: Pepper, CO2 enrichment, Seedling, Growth, Photosynthetic characteristic

Table 1

Effects of CO2 enrichment on plant height of pepper seedling cm"

处理
Treatment		 处理天数Days of treatment (d)
6 12 18 24
CK 2.57±0.21Bc 5.13±0.31Cc 7.10±0.36Cc 8.17±0.42Dd
C1 2.80±0.30ABbc 6.07±0.74BCb 9.47±0.67Bb 11.13±0.31Cc
C2 3.43±0.25Aab 7.70±0.26Aa 12.60±0.17Aa 15.20±0.44Aa
C3 3.13±0.31ABa 6.83±0.23ABb 11.97±0.42Aa 13.97±0.49Bb

Table 2

Effects of CO2 enrichment on stem diameter of pepper seedling cm"

处理
Treatment		 处理天数Days of treatment (d)
6 12 18 24
CK 0.21±0.02Ab 0.23±0.02Bb 0.25±0.03Ab 0.26±0.03Ab
C1 0.22±0.02Ab 0.25±0.02ABab 0.27±0.04Aab 0.28±0.02Aab
C2 0.26±0.03Aa 0.29±0.03Aa 0.30±0.01Aa 0.32±0.03Aa
C3 0.24±0.01Aab 0.27±0.01ABa 0.28±0.01Aab 0.30±0.03Aab

Table 3

Effects of CO2 enrichment on leaf area of pepper seedling cm2"

处理
Treatment		 处理天数Days of treatment (d)
6 12 18 24
CK 4.06±0.86Aa 5.10±0.98Bc 6.60±0.70Bb 8.26±0.58Bb
C1 4.65±0.55Aa 6.98±0.43Ab 7.67±0.70ABb 8.48±0.25Bb
C2 4.98±0.45Aa 8.31±0.44Aa 9.27±0.65Aa 12.28±0.93Aa
C3 4.75±0.54Aa 8.08±0.28Aab 9.22±0.76Aa 11.82±0.64Aa

Fig.1

Effects of CO2 enrichment on chlorophyll SPAD in leaves of pepper seedling Different capital letters and small letters mean significant difference at 0.01 and 0.05 level, respectively, the same below"

Fig.2

Effects of CO2 enrichment on Pn and Tr of pepper seedling"

Fig.3

Effects of CO2 enrichment on stomatal conductance of pepper seedling"

Fig.4

Effects of CO2 enrichment on Ci of pepper seedling"

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