Crops ›› 2019, Vol. 35 ›› Issue (4): 176-182.doi: 10.16035/j.issn.1001-7283.2019.04.027

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Effects of Salt Stress on Root Related Traits and Yield of Rice

Gu Jiaojiao,Hu Bowen,Jia Yan,Sha Hanjing,Li Jingwei,Ma Chao,Zhao Hongwei   

  1. Rice Research Institute, Northeast Agricultural University, Harbin 150030, Heilongjang, China
  • Received:2019-02-12 Revised:2019-04-23 Online:2019-08-15 Published:2019-08-06
  • Contact: Hongwei Zhao

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Abstract:

The effects of different concentrations of salt stress treatment on rice root morphological characteristics, root activity, root dry weight, root-shoot ratio and yield were analyzed using japonica rice Mudanjiang 30 (MDJ30) and Longdao 5 (LD5) as materials in cold region. Results showed that compared with the control, under salt stress, root length, root surface area, root volume, root activity and root dry weight all decreased significantly, and the decreasing range increased with the increase of salt concentration. Under the same salt stress treatment, the relative root length, relative root surface area, relative root volume, relative root activity and relative root dry weight of salt-tolerant variety LD5 were all larger than that of salt-sensitive variety MDJ30. Compared with the control, the root-shoot ratio under salt stress decreased continuously and the root-shoot ratio under S4 treatment decreased significantly during filling stage. Under salt stress, the yield of the two varieties decreased. Under the same salt stress, the yield difference between the two varieties was significantly. Correlation analysis showed that root-related traits at all growth stages were significantly positively correlated with yield. The inhibition of root growth under salt stress was adverse to the yield formation.

Key words: Rice, Salt stress, Root morphology, Root activity, Root dry weight, Yield

Fig.1

Changes of total root length of rice in main growth periods under salt stress Values followed by different letters indicate significant difference at P=0.05, the same below"

Fig.2

Changes of root surface area during major growth periods of rice under salt stress"

Fig.3

Changes of total root volume during major growth period of rice under salt stress"

Fig.4

Changes of injury velocity during major growth period of rice under salt stress"

"

品种
Variety		 处理
Treatment		 分蘖期
Tillering stage		 拔节期
Jointing stage		 孕穗期
Booting stage		 齐穗期
Full heading stage		 灌浆期
Filling stage		 成熟期
Mature stage
MDJ30 CK 1.146bc 3.136b 3.374b 3.622b 3.595b 3.146c
S1 1.008cd 2.571cd 2.766cd 2.948d 2.984d 2.690d
S2 0.848de 2.164de 2.362de 2.528e 2.524e 2.347de
S3 0.676de 1.599fg 1.754f 1.815g 1.812g 1.809fg
S4 0.576e 1.380g 1.451f 1.481h 1.478h 1.469g
LD5 CK 1.492a 3.759a 3.999a 4.355a 4.236a 4.158a
S1 1.328ab 3.1578b 3.359b 3.767b 3.706b 3.588b
S2 1.164bc 2.669c 3.279bc 3.353c 3.261c 3.135c
S3 0.903de 2.030ef 2.399de 2.439e 2.436e 2.412d
S4 0.784de 1.767fg 2.000de 2.025f 2.012f 2.000de
F值 品种Variety 17.114** 32.027** 32.245** 329.285** 314.294** 99.833**
F-value 处理Treatment 11.811** 58.284** 35.691** 430.636** 461.73** 80.867**
品种×处理
Treatment×Variety		 0.164 0.250 0.307 1.987 1.001 1.364

Table 2

Changes of root-shoot ratio during major growth periods of rice under salt stress"

品种
Variety		 处理
Treatment		 分蘖期
Tillering stage		 拔节期
Jointing stage		 孕穗期
Booting stage		 齐穗期
Full heading stage		 灌浆期
Filling stage		 成熟期
Mature stage
MDJ30 CK 0.320a 0.397a 0.172ab 0.118bc 0.110cd 0.090c
S1 0.309a 0.388a 0.158b 0.107c 0.102de 0.082c
S2 0.306a 0.380a 0.155b 0.105c 0.098de 0.080c
S3 0.301a 0.355a 0.148b 0.098c 0.092e 0.077c
S4 0.300a 0.348a 0.143b 0.096c 0.087e 0.075bc
LD5 CK 0.385a 0.395a 0.210a 0.144a 0.132a 0.120a
S1 0.384a 0.390a 0.197ab 0.138ab 0.124ab 0.112a
S2 0.374a 0.383a 0.195ab 0.137ab 0.120ab 0.111a
S3 0.371a 0.382a 0.192ab 0.132ab 0.118ab 0.105ab
S4 0.370a 0.381a 0.191ab 0.131ab 0.115bc 0.103ab
F值 品种Variety 13.570** 0.342 17.971** 53.198** 66.614** 63.003**
F-value 处理Treatment 0.118 0.290 0.721 2.094 5.251* 2.401
品种×处理
Treatment×Variety		 0.006 0.107 0.031 0.137 0.161 0.033

Table 3

Actural yield of MDJ 30 and LD5 g/m2"

处理
Treatment		 实际产量Actual yield
MDJ30 LD5
CK 805.80a 778.40c
S1 786.80b 776.82c
S2 562.70e 621.70d
S3 368.70g 388.90f
S4 271.50i 307.50h

Table 4

Correlation analysis between root system traits and grain yield"

性状
Trait		 生育时期Growth stage
分蘖期
Tillering stage		 拔节期
Jointing stage		 孕穗期
Booting stage		 齐穗期
Full heading stage		 灌浆期
Filling stage		 成熟期
Mature stage
根长Root length 0.765** 0.944** 0.974** 0.968** 0.963** 0.917**
根表面积Root surface area 0.846** 0.918** 0.916** 0.920** 0.907** 0.892**
根体积Root volume 0.822** 0.919** 0.930** 0.920** 0.939** 0.919**
根系活力Root activity 0.959** 0.917** 0.906** 0.943** 0.923** 0.873**
根干重Root dry weight 0.742** 0.875** 0.838** 0.896** 0.908** 0.837**
根冠比Root-shoot ratio 0.126 0.233 0.255 0.325 0.438* 0.321
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