Crops ›› 2021, Vol. 37 ›› Issue (4): 172-177.doi: 10.16035/j.issn.1001-7283.2021.04.026

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Effects of Drought at Different Stages of Grain Filling Period on Starch Accumulation of Sorghum Grains

Zhang Ruidong1,2(), Gao Mingyue2, Yue Zhongxiao1, Zhou Yufei2, Cao xiong1()   

  1. 1Institute of Industrial Crops, Shanxi Agricultural University, Fenyang 032200, Shanxi, China
    2College of Agronomy, Shenyang Agricultural University, Shenyang 110866, Liaoning, China
  • Received:2020-09-08 Revised:2020-11-15 Online:2021-08-15 Published:2021-08-13
  • Contact: Cao xiong E-mail:342185880@qq.com;cxxp1969@163.com

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Abstract:

The objective of this study was to investigate the effects of drought stress during filling period on starch accumulation in sorghum. Two sorghum varieties, Tieza17 (high starch content) and Liaoza11 (low starch content) were planted in pots as the experiment materials. The two varieties were suffered from drought stress at initial stage, middle stage and late stage of grain filling period, respectively. The starch content, amylose content, amylopectin content and grain yield of the two sorghum varieties were investigated. The results showed that the contents of starch, amylose and amylopectin and grain yield were decreased by drought occurred at filling period. The effects of drought stress on starch accumulation at different stages of grain filling period were mainly at the initial filling stage > the middle filling stage > the late filling stage. Tieza17 was more sensitive than Liaoza11 to the drought stress. The variable coefficients of starch indexes under drought stress was as follows: amylose > amylopetin to amylase ratio > total starch > amyloptin, indicating that amylose was more susceptible to drought stress than amylopectin. Generally, drought stress during filling period significantly influenced the starch accumulation, resulting in decrease of the 1000-seed weight, ultimately caused a decline of grain yield in sorghum.

Key words: Sorghum, Filling period, Drought, Starch

Table 1

Effects of drought stress on starch content in sorghum grains during the grain filling stage"

品种
Variety		 处理
Treatment		 总淀粉
Starch (%)		 直链淀粉
Amylose (%)		 支链淀粉
Amylopectin (%)		 支链淀粉/直链淀粉
Amylopectin/Amylose
TZ17 DS0 25.64±0.62a 5.35±0.12a 20.29±0.52a 3.79±0.06d
DS1 22.76±0.83c 4.17±0.07c 18.59±0.84b 4.46±0.22bc
DS2 24.57±0.24b 4.54±0.13b 20.03±0.27a 4.41±0.16bc
DS3 24.74±0.24b 4.66±0.04b 20.08±0.21a 4.31±0.09c
变异系数Variation coefficient (%) 4.86 9.69 4.22 7.18
LZ11 DS0 17.19±0.18d 3.15±0.13d 14.04±0.31c 4.47±0.29bc
DS1 16.17±0.08e 2.62±0.17f 13.55±0.23c 5.19±0.41a
DS2 16.43±0.08e 2.81±0.09ef 13.62±0.04c 4.85±0.15ab
DS3 16.72±0.06de 2.89±0.11e 13.83±0.16c 4.79±0.24ab
变异系数Variation coefficient (%) 2.44 7.92 1.96 7.56

Fig.1

Comparison of total starch accumulation content in sorghum grains"

Fig.2

Comparison of amylose accumulation content in sorghum grains"

Fig.3

Comparison of amylopectin accumulation content in sorghum grains"

Table 2

Effects of drought during filling stage on the grain yield and its components of sorghum"

处理
Treatment		 单株产量
Yield per
plant (g)		 千粒重
1000-seed
weight (g)		 穗粒数
Seeds per
panicle
TZ17DS0 (CK) 124.17±14.08a 36.95±1.26a 3380.19±363.61a
TZ17DS1 79.78±11.58ef 25.51±2.53e 3261.79±670.37a
TZ17DS2 99.67±3.73cd 28.81±2.16cd 3565.16±294.52a
TZ17DS3 110.54±5.67bc 32.60±1.73b 3428.49±237.17a
LZ11DS0 (CK) 111.99±10.61b 31.22±3.17bc 3641.13±556.84a
LZ11DS1 78.01±5.66f 21.86±3.40f 3861.37±735.78a
LZ11DS2 89.72±4.03de 25.35±3.41e 3625.54±486.40a
LZ11DS3 100.74±3.82bcd 28.36±2.83d 3659.07±270.82a
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