Crops ›› 2022, Vol. 38 ›› Issue (1): 179-183.doi: 10.16035/j.issn.1001-7283.2022.01.027

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Effects of Spraying Paclobutrazol on Growth and Photosynthetic Characters of Broomcorn Millet

Yan Feng()   

  1. Qiqihar Sub-Academy of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161006, Heilongjiang, China
  • Received:2021-04-02 Revised:2021-12-28 Online:2022-02-15 Published:2022-02-16

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Abstract:

In order to investigate effects of paclobutrazol spraying time and concentration on growth and photosynthetic characters of broomcorn millet, Qishu 1 was used as materials, and the randomized block design was conducted. Four concentrations (150, 300, 600, 1200mg/L) of paclobutrazol were applied on broomcorn millet, at the tillering, elongation and booting stage, with distilled water as control. The results showed that spraying of paclobutrazol could change morphological traits of stalk, decrease plant height, increase stem diameter and lodging resistance. The appropriate concentration of paclobutrazol in the growth period of broomcorn millet could promote the net photosynthetic rate, transpiration rate and relative chlorophyll content of broomcorn millet, and the three indexes all increased firstly and then decreased with the increase of paclobutrawl concentration. Spraying paclobutrazol could increase the weight of main spike, grain weight of main spike, and grain yield, and the effect of spraying at tillering stage was better than that of jointing stage and booting stage, but when the concentration was too high, the effect of increasing yield reduced. According to the comprehensive analysis, spraying 300mg/L paclobutrazol at tillering stage could effectively enhance lodging resistance and photosynthetic indexes of millet, which is a suitable cultivation measure for preventing lodging and increasing yield.

Key words: Broomcorn millet, Agronomic trait, Lodging resistance, Paclobutrazol, Photosynthetic characters

Table 1

Effects of paclobutrazol on stem characteristics of broomcorn millet"

喷施时期
Spraying stage		 处理
Treatment		 主茎高
Height of main
stem (cm)		 茎粗
Stem diameter
(cm)		 节数
Node
number
分蘖期 清水（CK） 149.5a 0.44f 8.8ab
Tillering 150mg/L 138.4c 0.48d 9.1a
300mg/L 132.6d 0.53bc 8.9ab
600mg/L 123.9e 0.56b 9.0a
1200mg/L 107.3g 0.59a 9.0a
拔节期 150mg/L 141.7bc 0.47de 9.1a
Elongation 300mg/L 137.1c 0.50cd 8.8ab
600mg/L 130.0d 0.54bc 8.9ab
1200mg/L 118.8f 0.56b 9.1a
孕穗期 150mg/L 143.6b 0.46e 8.8ab
Booting 300mg/L 140.9bc 0.49cd 9.0a
600mg/L 137.5c 0.51c 8.9ab
1200mg/L 132.5d 0.52c 9.1a

Table 2

Effects of paclobutrazol on stem lodging indexes of broomcorn millet"

喷施时期
Spraying
stage		 处理
Treatment		 重心高度
Gravity
center
height
(cm)		 茎鲜重
Fresh
weight
of stem
(g)		 茎秆
弯折力
Bending
force of
stem (N)		 茎秆倒
伏指数
Lodging
index of stem
[(cm·g)/N]
分蘖期 清水（CK） 87.37 64.92 128.15 44.33a
Tillering 150mg/L 83.04 53.6 158.54 28.15e
300mg/L 79.56 48.57 162.49 23.87f
600mg/L 75.34 46.81 167.63 21.42g
1200mg/L 68.38 44.43 158.02 18.84h
拔节期 150mg/L 85.02 58.02 142.67 34.63c
Elongation 300mg/L 82.26 53.37 148.96 29.42de
600mg/L 78.02 50.26 150.75 26.01ef
1200mg/L 71.28 47.74 143.30 23.78f
孕穗期 150mg/L 86.16 61.15 137.84 38.24b
Booting 300mg/L 84.54 58.36 143.51 34.35c
600mg/L 82.58 55.59 147.66 31.15d
1200mg/L 78.51 52.93 139.22 29.84de

Table 3

Effects of paclobutrazol on photosynthesis indices of broomcorn millet"

喷施时期
Spraying
stage		 处理
Treatment		 SPAD Pn
[μmol/(m2·s)]		 Tr
[mmol/(m2·s)]		 Ci
[μmol/(m2·s)]
分蘖期
Tillering		 清水
（CK）		 14.13f 12.75g 2.83e 131.85a
150mg/L 17.77cd 16.56cd 3.41c 114.41d
300mg/L 19.86a 18.43a 4.13a 93.53h
600mg/L 18.64bc 17.64bc 3.75b 102.77f
1200mg/L 17.36cd 15.82d 3.37c 119.02bc
拔节期 150mg/L 17.39cd 16.05d 3.20cd 117.21c
Elongation 300mg/L 19.14b 17.80b 3.93ab 98.63g
600mg/L 18.23c 16.95c 3.43c 105.34e
1200mg/L 16.51de 15.27e 3.09d 122.45b
孕穗期 150mg/L 16.40de 15.16e 3.02d 120.10b
Booting 300mg/L 18.06c 16.78c 3.71b 101.29f
600mg/L 16.95d 15.64d 3.30c 117.38c
1200mg/L 15.36e 14.01f 2.96d 128.53ab

Table 4

Effects of paclobutrazol on yield and its components of broomcorn millet"

喷施时期
Spraying
stage		 处理
Treatment		 主穗重
Weight of
main
spike (g)		 主穗粒重
Grain weight
of main
spike (g)		 千粒重
1000-grain
weight
(g)		 产量
Yield
(kg/hm2)
分蘖期 清水（CK） 6.31i 4.56h 5.66ab 3357.53f
Tillering 150mg/L 6.93e 5.01de 5.61ab 3548.23c
300mg/L 7.88a 6.58a 5.73a 3863.04a
600mg/L 7.27cd 5.43c 5.74a 3621.99c
1200mg/L 6.66gh 4.87fg 5.66ab 3455.75de
拔节期 150mg/L 6.72fg 4.93efg 5.59b 3479.64d
Elongation 300mg/L 7.50b 5.72b 5.67ab 3731.86b
600mg/L 7.03d 5.10d 5.60ab 3587.61c
1200mg/L 6.64gh 4.83g 5.46c 3463.59d
孕穗期 150mg/L 6.56h 4.88g 5.57b 3421.44e
Booting 300mg/L 7.24c 5.43c 5.73a 3636.32c
600mg/L 6.72ef 5.07def 5.61ab 3475.07de
1200mg/L 6.60gh 4.76g 5.66ab 3444.18de
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