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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (8): 1238-1247.doi: 10.3724/SP.J.1006.2020.02001

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Tillering characteristics and its relationships with population productivity of japonica rice Nanjing 9108 under salinity stress

WEI Huan-He1,GE Jia-Lin1,ZHANG Xu-Bin1,MENG Tian-Yao2,LU Yu1,LI Xin-Yue1,TAO Yuan1,DING En-Hao1,CHEN Ying-Long1,DAI Qi-Gen1,*()   

  1. 1Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Research Institute of Rice Industrial Engineering Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China
    2Joint International Research Laboratory of Agriculture and Agro-product Safety, Ministry of Education/Institute of Agricultural Science and Technological Development, Yangzhou University, Yangzhou 225009, Jiangsu, China
  • Received:2020-01-09 Accepted:2020-04-15 Online:2020-08-12 Published:2020-04-26
  • Contact: Qi-Gen DAI E-mail:qgdai@yzu.edu.cn
  • Supported by:
    National Key Technology Support Program of China(2015BAD01B03);Key Research and Development Program of Jiangsu Province(BE2015337);Key Research and Development Program of Jiangsu Province(BE2016370);National Natural Science Foundation of China(31901448);Natural Science Foundation of the Jiangsu Higher Education Institutions of China(19KJB210004);Priority Academic Program Development of Jiangsu Higher Education Institutions

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Abstract:

This study was conducted to clarify the characteristics for occurrence of rice tillers, its dominant leaf positions, and panicle formation under salinity stress, and to provide a basis for the rational utilization and regulation of rice tillers for high-yield cultivation methods in tidal flat area. Conventional japonica rice Nanjing 9108 was used with three salinity treatments, namely, Control (CK, 0 salt concentration), Medium-salinity stress (MS, 0.15% salt concentration), and high-salinity stress (HS, 0.3% salt concentration) to compare the tillering and panicle formation characteristics and its contribution to population yield under salinity stress. As a result, the average yields (t hm-2) of CK, MS, and HS were 9.7, 7.4, and 4.2 across two years, respectively; the number of panicles, spikelets per panicle, percentage of filled grains, and 1000-grain weight in MS and HS treatments were significantly lower than those in CK. Compared with CK, the number of tillers at jointing, heading, and maturity and percentage of productive tillers in MS and HS treatments were decreased. For CK, the primary tillers emerged from the 3rd leaf to 7th leaf on the main stem, with higher tiller emerging rate and more panicles from the 4th leaf to 6th leaf among them, and secondary tillers mainly emerged and earbeared from 1/4 and 1/5 tiller position; as for MS and HS, tillers are mainly primary ones emerging from the 4th to 6th leaf as the dominant position for the tiller occurrence and earbearing. The mean value of panicle length, total grains, grain density, and number of grains and its total grains on the primary and secondary branches in MS and HS treatments were both lower than those in CK. Our results suggest that, salinity stress caused lower number of panicles per plant, inferior growth of individuals and populations, smaller panicle types, and finally lower grain yield.

Key words: salinity stress, rice, tillering characteristics, population productivity

Table 1

Effects of salinity stress on rice grain yield and its components"

年份
Year		 处理
Treatment		 穗数
Number of
panicles
(×104 hm-2)		 每穗粒数
Spikelets per
panicle		 颖花量
Number of spikelets
(×107 hm-2)		 结实率
Percentage of filled grains (%)		 千粒重
1000-
grain
weight (g)		 实产
Actual yield
(t hm-2)		 成熟期
干物重
Biomass
accumulation at maturity
(t hm-2)		 收获
指数
Harvest index
2018 对照 CK 359.5 a 133.6 a 48.0 a 90.5 a 23.9 a 9.7 a 16.6 a 0.503 c
中盐 MS 335.1 b 112.4 b 37.7 b 88.7 ab 22.7 b 7.3 b 12.0 b 0.524 b
高盐 HS 293.7 c 87.2 c 25.6 c 82.6 b 21.2 c 4.3 c 6.7 c 0.549 a
2019 对照 CK 344.3 a 135.3 a 46.6 a 91.4 a 24.2 a 9.6 a 16.2 a 0.511 c
中盐 MS 323.1 b 115.7 b 37.4 b 88.2 b 23.1 b 7.4 b 11.9 b 0.533 b
高盐 HS 277.5 c 84.9 c 23.6 c 83.5 c 21.6 c 4.1 c 6.4 c 0.553 a

Table 2

Effects of salinity stress on tiller number at the main growth stages of rice population"

年份
Year		 处理
Treatment		 群体茎蘖数 Tiller number of rice population (×104 hm-2)
拔节期Jointing 抽穗期Heading 成熟期Maturity
2018 对照 CK 459.1 a 365.9 a 359.5 a
中盐 MS 443.3 b 351.5 b 335.1 b
高盐 HS 404.5 c 314.3 c 293.7 c
2019 对照 CK 450.1 a 350.4 a 344.3 a
中盐 MS 439.6 b 339.1 b 323.1 b
高盐 HS 388.7 c 296.5 c 277.5 c

Fig. 1

Effects of salinity stress on percentage of productive tillers of rice CK: control; MS: medium-salinity stress; HS: high-salinity stress. Bars superscripted by different lowercase are significantly different at the 5% probability level between treatments."

Table 3

Effects of salinity stress on tiller emerging rate and panicle rate of rice"

叶位
Leaf position		 分蘖发生率 Emerging rate (%) 分蘖成穗率 Panicle rate (%)
对照 CK 中盐 MS 高盐 HS 对照 CK 中盐 MS 高盐 HS
3/0 27.78 16.67 40.00 33.33
4/0 94.44 83.33 66.67 70.59 73.33 75.00
5/0 100.00 100.00 100.00 88.89 88.89 83.33
6/0 100.00 100.00 100.00 100.00 100.00 94.44
7/0 77.78 61.11 38.89 28.57 18.18 14.29
1/4 66.67 55.56 44.44 50.00 30.00 25.00
2/4 38.89 16.67 11.11 14.29 33.33
3/4 22.22 5.56 25.00
1/5 66.67 22.22 11.11 33.33 25.00 50.00
2/5 22.22 11.11 5.56
1/6 11.11 11.11 50.00 50.00

Table 4

Panicles composition of stems and tillers of rice under salinity stress"

叶位
Leaf position		 对照 CK 中盐 MS 高盐 HS
个数 Number 比例 Rate (%) 个数 Number 比例 Rate (%) 个数 Number 比例 Rate (%)
单株成穗数
No. of productive tillers per plant		 4.61 a 4.00 b 3.50 c
主穗Main stem (0/0) 1.00 21.69 1.00 25.00 1.00 28.57
3/0 0.11 2.41 0.06 1.39
4/0 0.67 14.46 0.61 15.28 0.50 14.29
5/0 0.89 19.28 0.89 22.22 0.83 23.81
6/0 1.00 21.69 1.00 25.00 0.94 26.98
7/0 0.22 4.82 0.11 2.78 0.06 1.59
一次分蘖合计
Primary tillers in total		 2.89 62.67 2.67 66.67 2.33 66.67
1/4 0.33 7.24 0.17 4.17 0.11 3.17
2/4 0.06 1.21 0.06 1.39
3/4 0.06 1.21
1/5 0.22 4.78 0.06 1.39 0.06 1.59
1/6 0.06 1.21 0.06 1.39
二次分蘖合计
Secondary tillers in total		 0.72 15.64 0.33 8.33 0.17 4.76

Table 5

Contribution of stems and tillers in each leaf position of rice under salinity stress"

叶位
Leaf position		 对照 CK 中盐 MS 高盐 HS
产量
Yield (t hm-2)		 比例
Rate (%)		 产量
Yield (t hm-2)		 比例
Rate (%)		 产量
Yield (t hm-2)		 比例
Rate (%)
群体产量
Population productivity		 9.65 a 7.35 b 4.20 c
主穗Main stem (0/0) 2.32 24.05 2.12 28.86 1.36 32.45
3/0 0.22 2.31 0.10 1.33
4/0 1.33 13.76 1.06 14.44 0.51 12.18
5/0 1.95 20.20 1.65 22.48 1.01 24.16
6/0 2.18 22.64 1.75 23.83 1.15 27.37
7/0 0.38 3.93 0.17 2.25 0.04 0.89
一次分蘖合计
Primary tillers in total		 6.06 62.84 4.73 64.34 2.71 64.61
1/4 0.65 6.76 0.27 3.66 0.08 1.92
2/4 0.09 0.91 0.07 0.99
3/4 0.08 0.86
1/5 0.36 3.72 0.08 1.12 0.04 1.02
1/6 0.08 0.86 0.08 1.02
二次分蘖合计
Secondary tillers in total		 1.27 13.11 0.50 6.80 0.12 2.94

Table 6

Effects of salinity stress on panicles traits of stems and tillers in each leaf position of rice"

处理
Treatment		 叶位
Leaf position		 穗长
PL (cm)		 总粒数
TG		 结实率
PFG (%)		 着粒密度
GD
(grain cm-1)		 一次枝梗
Primary branch		 二次枝梗
Secondary branch
枝粳数
NB		 枝梗粒数
TG		 枝粳数
NB		 枝梗粒数 TG
对照 CK 0/0 18.2 161.3 91.1 8.9 12.0 74.1 30.0 87.2
3/0 16.4 139.8 90.9 8.5 12.0 72.9 22.0 66.9
4/0 17.2 141.6 89.1 8.2 13.0 78.7 24.0 62.9
5/0 18.1 155.2 89.5 8.6 13.0 77.4 28.0 77.8
6/0 17.5 153.4 90.2 8.8 12.0 76.8 26.0 76.6
7/0 16.7 122.4 88.2 7.3 10.0 63.4 21.0 59.0
1/4 16.2 139.8 88.6 8.6 11.0 66.7 24.0 73.1
2/4 15.8 114.1 87.6 7.2 10.0 58.7 22.0 55.4
3/4 14.8 106.9 88.5 7.2 11.0 62.3 17.0 44.6
1/5 15.3 116.5 88.7 7.6 11.0 62.4 18.0 54.1
1/6 14.6 107.0 88.9 7.3 10.0 60.8 16.0 46.2
平均值 Mean 16.4 a 132.5 a 89.2 a 8.0 a 11.4 a 68.6 a 22.5 a 64.0 a
中盐 MS 0/0 16.8 145.8 90.4 8.7 12.0 74.1 25.0 71.7
3/0 15.8 122.6 89.4 7.8 10.0 59.4 19.0 63.2
4/0 15.7 121.2 89.0 7.7 10.0 61.3 21.0 59.9
5/0 16.2 128.9 89.6 8.0 12.0 71.5 22.0 57.4
6/0 15.8 122.4 88.9 7.7 13.0 66.7 21.0 55.7
7/0 15.6 104.8 88.4 6.7 11.0 65.6 15.0 39.2
1/4 15.8 114.5 87.6 7.2 10.0 56.6 22.0 57.9
2/4 14.1 93.3 87.5 6.6 9.0 53.4 16.0 39.9
1/5 15.6 106.7 86.6 6.8 12.0 68.7 14.0 38.0
1/6 14.1 98.5 85.2 7.0 10.0 58.6 14.0 39.9
平均值 Mean 15.6 ab 115.9 b 88.3 ab 7.4 ab 10.9 ab 63.6 b 18.9 b 52.3 b
高盐 HS 0/0 15.7 121.6 84.5 7.7 10.0 61.2 21.0 60.4
4/0 14.6 93.5 82.5 6.4 9.0 53.1 16.0 40.4
5/0 15.1 111.0 82.7 7.4 11.0 63.4 18.0 47.6
6/0 15.4 109.5 83.8 7.1 11.0 67.9 14.0 41.6
7/0 11.7 62.4 81.6 5.3 10.0 48.9 4.0 13.5
1/4 12.7 67.7 80.7 5.3 10.0 55.6 5.0 12.1
1/5 12.5 70.7 82.3 5.7 9.0 48.9 9.0 21.8
平均值 Mean 14.0 b 90.9 c 82.6 b 6.4 b 10.0 b 57.0 c 12.4 c 33.9 c
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