Crops ›› 2020, Vol. 36 ›› Issue (5): 174-181.doi: 10.16035/j.issn.1001-7283.2020.05.026

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Effects of New Plant Growth Regulator B2 on Photosynthetic Fluorescence Characteristics and Yield of Maize

Wu Qiong1(), Ding Kaixin1, Yu Minglong1, Huang Wenting1, Zuo Guanqiang1, Feng Naijie1,2, Zheng Dianfeng1,2()   

  1. 1College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China
    2College of Agriculture, Guangdong Ocean University, Zhanjiang 524088, Guangdong, China
  • Received:2020-01-05 Revised:2020-02-11 Online:2020-10-15 Published:2020-10-12
  • Contact: Zheng Dianfeng E-mail:1316554305@qq.com

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Abstract:

In order to investigate the effects of plant growth regulator B2 seed dressing and leaf spraying on the agronomic characteristics, photosynthetic characteristics, chlorophyll fluorescence parameters and yield of maize, the appropriate dose of B2 seed dressing and leaf spraying should be determined. Using Demeiya 1 as the material, the field-randomized block test method was used to set B2 seed dressing doses, including 0 (CK), 25 (BT1), 50 (BT2) and 100 (BT3) mg/kg, and the leaf spraying doses, including 0 (CK1), 25 (YT1), 50 (YT2), and 100 (YT3) mg/L. The results showed that B2 seed dressing and leaf spraying treatment, compared with CK and CK1, could reduce the plant height and ear height of maize, and increase the maize stem diameter, leaf area and dry matter accumulation and also increase the SPAD value and net photosynthetic rate (Pn), transpiration rate (Tr). B2 seed dressing and leaf spraying treatment could increase the actual quantum yield Y(Ⅱ), relative electron transfer efficiency (ETR), photochemical efficiency (Fv/Fm) and potential photochemical activity (Fv/Fo), and reduce the non-photochemical quenching coefficient (NPQ). Compared with CK and CK1, B2 seed dressing and leaf spraying treatment increased maize yield by 5.90%, 14.20%, 5.81% and 11.72%, 14.40%, 5.36% respectively. To sum up, when the seed dressing dose of B2 was 50mg/kg and the leaf spraying dose was 50mg/L, the yield of maize could be significantly increased.

Key words: Maize (Zea mays L.), B2, Photosynthesis, Chlorophyll fluorescence

Table 1

Effects of B2 seed dressing and leaf spraying on morphological indexes of maize"

处理Treatment 株高Plant height (cm) 穗位高Ear height (cm) 茎粗Stem diameter (cm) 棒三叶叶面积Area of three ear leaves (cm2)
CK 288.80±5.21a 110.40±2.49a 2.25±0.02b 1 936.28±47.68b
BT1 283.33±2.96ab 103.67±3.90a 2.45±0.07ab 2 012.69±119.30b
BT2 273.67±3.48bc 102.50±4.37a 2.55±0.11a 2 367.50±62.59a
BT3 271.33±1.33c 86.00±1.00b 2.52±0.05a 2 065.40±68.14b
CK1 284.20±3.20a 104.50±3.27a 2.11±0.06b 1 778.66±17.55bc
YT1 273.80±2.57b 96.60±2.55ab 2.30±0.12ab 1 975.85±54.27a
YT2 264.23±2.11bc 88.30±2.58b 2.45±0.08a 1 863.29±11.01ab
YT3 259.15±4.31c 77.75±2.39c 2.48±0.04a 1 741.36±41.34c

Fig.1

Effects of B2 seed dressing and leaf spraying on SPAD value of maize"

Table 2

Effects of B2 seed dressing and leaf spraying on photosyntheic characteristics of maize"

时期
Stage		 处理
Treatment		 净光合速率
Pn [μmol/(m2·s)]		 蒸腾速率
Tr [μmol/(m2·s)]		 气孔导度
Gs [mmol/(m2·s)]		 胞间二氧化碳浓度
Ci (μmol/mol)
灌浆始期 CK 17.50±0.67b 1.74±0.11d 141.04±11.50a 153.00±26.32a
Beginning of grouting BT1 15.40±2.56b 2.55±0.24c 173.49±29.21a 159.37±22.54a
BT2 26.83±0.70a 3.77±0.11a 155.85±6.68a 72.33±6.12b
BT3 17.93±0.42b 3.09±0.10b 174.00±40.49a 135.03±28.66ab
CK1 15.51±1.20b 2.76±0.16b 100.80±4.77b 145.27±64.58a
YT1 25.18±2.00a 3.70±0.35a 161.20±9.10a 45.80±4.94a
YT2 25.06±1.86a 2.24±0.16bc 165.43±15.74a 61.70±18.88a
YT3 19.45±2.11ab 1.84±0.20c 157.66±27.61a 181.40±39.68a
乳熟期 CK 18.33±0.48b 2.52±0.16b 131.29±14.82a 131.27±16.49a
Milk stage BT1 20.61±0.54ab 3.66±0.01a 123.80±7.82a 116.77±17.63a
BT2 21.96±1.37a 3.72±0.22a 152.82±13.60a 155.70±5.83a
BT3 21.31±0.59a 3.12±0.33b 130.75±10.18a 124.17±20.13a
CK1 15.96±1.06c 2.70±0.18b 97.13±8.46a 152.60±12.39a
YT1 22.12±2.24a 3.62±0.31a 101.16±11.94a 133.73±26.29a
YT2 17.26±0.05bc 3.00±0.13ab 92.13±6.69a 88.97±21.39a
YT3 20.74±0.22ab 3.43±0.09a 120.21±6.16a 93.10±17.72a

Table 3

Effects of B2 seed dressing and leaf spraying on chlorophyll fluorescence parameters of maize leaves"

时期Stage 处理Treatment Y(Ⅱ) ETR Fv/Fm Fv/Fo NPQ
灌浆始期 CK 0.22±0.00c 10.77±0.24c 0.81±0.00b 4.34±0.07b 3.53±0.68a
Beginning of grouting BT1 0.35±0.02b 17.73±1.13b 0.82±0.00ab 4.70±0.12ab 2.38±0.06a
BT2 0.46±0.03a 23.10±1.57a 0.83±0.00a 4.92±0.05a 2.97±0.35a
BT3 0.28±0.04bc 13.97±1.78bc 0.82±0.01ab 4.49±0.18b 3.54±0.47a
CK1 0.21±0.02b 10.70±0.86c 0.77±0.01b 3.38±0.23b 2.43±0.07a
YT1 0.26±0.02b 12.83±0.93bc 0.82±0.00a 4.51±0.15a 3.85±0.28a
YT2 0.44±0.03a 19.10±1.40ab 0.82±0.01a 4.65±0.27a 2.62±0.79a
YT3 0.42±0.08a 21.07±3.67a 0.82±0.01a 4.48±0.28a 4.07±0.61a
乳熟期 CK 0.56±0.02b 28.13±0.87b 0.80±0.01a 4.00±0.13a 0.87±0.06a
Milk stage BT1 0.59±0.01b 29.83±0.50b 0.81±0.00a 4.30±0.04a 0.89±0.07a
BT2 0.64±0.01a 32.23±0.41a 0.81±0.01a 4.34±0.13a 0.78±0.10a
BT3 0.55±0.02b 27.63±0.84b 0.81±0.01a 4.29±0.16a 0.89±0.22a
CK1 0.53±0.02b 26.73±1.04b 0.79±0.00b 3.91±0.06b 1.44±0.21a
YT1 0.62±0.02a 31.27±1.07a 0.83±0.00a 4.76±0.09a 1.45±0.06a
YT2 0.61±0.01a 30.63±0.44a 0.82±0.00a 4.51±0.03b 1.10±0.09a
YT3 0.60±0.01a 30.30±0.50a 0.82±0.00a 4.69±0.06ab 1.24±0.32a

Fig.2

Effects of B2 seed dressing and leaf spraying on dry matter accumulation of maize"

Table 4

Effects of B2 dressing and leaf spraying on yield and yield components of maize"

处理
Treatment		 穗粗
Ear diameter (mm)		 穗长
Ear length (cm)		 秃尖长
Bare top length (mm)		 行粒数
Kerenls per row		 穗行数
Rows per ear		 百粒重
100-grain weight (g)		 产量
Yield (kg/hm2)
CK 44.72±0.45b 19.56±0.14b 8.86±0.67a 32.73±0.32b 14.63±0.26a 24.61±0.51b 10 017.96±293.24b
BT1 45.55±0.49b 20.24±0.22a 4.02±0.21c 33.70±0.25b 14.93±0.24a 25.95±0.38a 10 608.95±85.80b
BT2 50.50±0.23a 20.19±0.20a 5.64±0.52b 34.97±0.30a 14.80±0.35a 26.81±0.14a 11 440.54±135.34a
BT3 50.48±0.55a 19.30±0.11b 3.42±0.23c 33.13±0.29b 14.63±0.03a 25.73±0.35ab 10 600.22±351.89b
CK1 44.29±0.25b 17.43±0.53b 7.74±0.42a 32.20±0.35c 14.93±0.29a 23.45±0.52b 9 869.06±348.10c
YT1 45.10±0.30b 19.41±0.84a 7.23±0.95a 33.43±0.27b 15.13±0.18a 25.64±0.29a 11 025.35±210.35ab
YT2 46.07±0.39a 19.48±0.20a 2.52±0.26b 34.57±0.27a 15.00±0.12a 26.39±0.25a 11 290.60±204.04a
YT3 46.26±0.16a 18.95±0.34ab 3.00±0.42b 32.57±0.22bc 15.07±0.44a 25.72±0.61a 10 398.67±147.04bc
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