Crops ›› 2020, Vol. 36 ›› Issue (2): 28-33.doi: 10.16035/j.issn.1001-7283.2020.02.005

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Screening of High-Yield Germplasms for Ratoon Rice and Analysis of High Yield Composition

Liu Xin1,2,Zhu Rong2,Yang Mei1,2,Liu Zhangyong1,2()   

  1. 1 Engineering Research Center of Ecology and Agricultural Use of Wetland of Ministry of Education, Yangtze University, Jingzhou 434025, Hubei, China
    2 Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou 434025, Hubei, China
  • Received:2019-08-26 Revised:2019-11-15 Online:2020-04-15 Published:2020-04-13
  • Contact: Zhangyong Liu E-mail:lzy1331@hotmail.com

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Abstract:

The high-yield germplasms of ratoon rice are the material basis for breeding rice varieties with strong regeneration ability. The lack of rice varieties with strong regeneration ability is one of the important factors restricting the development of ratoon rice. In this study, 247 rice germplasms were planted as ratoon rice in Jianghan Plain to screen high yield ratoon rice germplasms and to explore the crucial factors that affects the yield of the ratoon rice according to yield components analysis, which was aimed to provide basic materials and theoretical basis for regeneration of germplasm resources and breeding of new varieties. The results showed that 247 core germplasm resources were able to mature in heading and the variation coefficient of agronomic traits was 10.31%-51.83%. Twenty-seven high-yield rice germplasm resources were screened out. Among them, 4 double-season high-yield germplasms with the yield per plant over 60.00g could be used as parents for mining of ratoon ability gene and high yield breeding of ratoon rice. The correlation and path analysis of yield components of high yield group suggested that the key traits to improve the yield of the ratooning rice is to increase the number of spikelets per panicle and the number of effective panicles. The yield of main crop was significantly negative correlated with that of ratoon rice, so it was suggested that we should switch the direction of rice breeding with the objective of increasing annual rice yield instead of increasing rice yield in one season only.

Key words: Ratoon rice, Germplasm, Agronomic trait, High-yield germplasm, Jianghan Plain

Table 1

Agronomic characters performance of rice core germplasms"

稻季
Rice season		 性状Trait 极小值
Min.		 极大值
Max.		 均值±标准差
Mean±SD		 变异系数
Coefficient of variation (%)
头季稻 抽穗期Heading stage (d) 57.00 87.00 78.85±8.13 10.31
Main crop 株高Plant height (cm) 67.88 170.80 103.59±20.65 19.93
每穴有效穗数Effective panicles per hole 5.88 28.25 15.52±3.77 24.27
穗长Panicle length (cm) 13.59 28.50 20.99±2.91 13.87
每穗颖花数Spikelets per panicle 11.61 249.23 113.07±34.41 30.43
每穗实粒数Grains per panicle 1.81 224.17 87.80±28.49 32.45
结实率Setting rate (%) 16.00 94.00 76.76±10.88 14.17
千粒重1000-grain weight (g) 16.34 33.72 24.69±2.93 11.87
单株产量Yield per plant (g) 0.62 58.53 31.28±9.40 30.05
再生稻 抽穗期Heading stage (d) 28.00 42.00 37.38±4.58 12.26
Ratoon rice 株高Plant height (cm) 53.95 128.90 80.94±14.94 18.45
每穴有效穗数Effective panicles per hole 4.13 31.88 16.67±4.83 28.99
穗长Panicle length (cm) 9.01 28.86 16.89±2.71 16.05
每穗颖花数Spikelets per panicle 14.10 152.29 47.70±19.54 40.95
每穗实粒数Grains per panicle 7.68 129.57 29.94±15.42 51.52
结实率Setting rate (%) 7.00 93.00 63.24±14.95 23.64
千粒重1000-grain weight (g) 11.37 37.62 22.03±3.49 15.85
单株产量Yield per plant (g) 1.28 45.98 10.65±5.52 51.83

Table 2

Agronomic traits of high-yield rice germplasms"

稻季
Rice
season		 田间
编号
Field
code		 抽穗
期(d)
Heading
stage		 株高(cm)
Plant
height		 每穴有效穗数
Effective
panicles
per hole		 穗长(cm)
Panicle
length		 每穗颖花数
Spikelets
per panicle		 每穗实粒数
Grains
per panicle		 结实率(%)
Setting rate		 千粒重(g)
1000-grain weight		 头季稻单株
产量(g)
Yield per plant
of main crop		 再生季稻单
株产量(g)
Yield per plant
of ratoon rice		 两季总单
株产量(g)
Total yield
per plant
头季稻 CK 83.00 104.65±3.25 10.25±0.33 24.99±1.66 196.30±8.12 145.50±5.63 74.12±6.52 25.50±1.58 38.00±1.50 15.20±0.36 53.20±1.86
Main IR001 86.00 104.68±2.93 22.84±1.26 19.75±2.71 107.65±6.50 82.24±2.46 76.60±6.91 26.64±1.12 43.24±2.45 13.34±0.77 56.59±3.22
crop IR010 86.00 135.05±2.19 27.91±1.30 19.75±1.06 167.16±10.60 89.42±4.19 53.52±3.34 26.18±1.15 46.16±1.72 13.19±0.52 59.35±2.24
IR013 85.25 104.28±2.74 24.67±1.64 15.00±1.35 166.61±11.03 90.8±5.23 73.31±5.09 23.90±1.21 43.78±2.28 5.35±0.59 49.13±2.87
IR021 85.25 107.80±2.13 27.10±2.92 17.88±1.18 163.42±7.18 90.38±5.23 55.34±3.68 25.86±1.52 41.78±1.02 18.23±1.52 60.01±3.54
IR023 85.25 103.85±1.91 24.90±2.64 20.75±1.71 127.33±6.37 99.00±4.42 77.77±4.78 23.07±1.38 47.37±2.64 12.04±0.64 59.41±3.28
IR044 84.00 94.58±2.58 23.29±2.16 18.75±1.35 159.09±9.33 119.89±7.53 75.39±3.17 20.74±1.43 46.62±2.89 18.59±1.25 65.21±3.64
IR088 78.50 93.95±2.19 21.01±1.91 18.88±1.18 118.31±3.54 102.41±4.35 86.62±2.06 24.10±1.19 46.60±1.27 4.81±0.66 51.41±0.39
IR090 78.50 94.58±2.58 20.57±2.01 17.13±1.53 145.11±14.44 113.70±9.52 78.44±5.52 23.94±2.30 46.57±3.18 9.22±1.42 55.79±4.60
IR112 74.00 85.38±6.54 19.98±1.54 16.10±1.85 162.52±12.71 112.82±10.12 69.43±3.52 27.38±1.29 49.69±3.72 10.01±1.25 59.69±4.97
IR119 47.00 88.50±2.12 20.51±1.50 15.75±1.35 128.26±10.64 11.94±5.03 87.39±5.43 27.32±2.48 48.15±3.63 11.80±1.81 59.95±5.36
JR018 85.25 105.08±3.78 21.44±1.50 13.75±1.35 143.98±15.98 128.29±12.77 89.08±5.00 25.91±2.08 45.67±3.37 9.28±2.44 54.95±5.81
JR067 82.50 106.3±4.94 22.58±2.11 14.13±1.53 162.17±12.36 138.88±12.30 85.64±5.18 26.09±1.48 51.16±3.12 16.28±0.27 67.44±3.15
JR082 79.00 127.30±2.12 24.11±1.22 15.55±1.78 135.65±4.03 117.93±3.79 86.94±3.21 24.95±2.18 45.71±2.15 22.35±2.97 68.06±6.12
再生稻 CK 40.00 85.25±2.36 10.25±0.31 19.97±2.29 94.42±10.86 66.50±6.98 70.43±7.02 22.30±1.35 38.00±1.50 15.20±0.36 53.20±1.86
Ratoon IR007 42.50 101.17±3.29 23.61±2.58 25.38±2.53 51.72±4.92 33.32±2.01 64.54±2.25 22.90±1.21 30.89±1.89 19.34±1.59 50.23±3.46
rice IR021 42.50 68.57±2.80 20.14±1.34 23.13±1.53 44.98±3.81 37.90±3.52 84.31±2.24 20.70±0.78 41.78±1.02 18.23±1.52 60.01±3.54
IR044 41.00 68.65±3.27 16.61±1.30 16.00±1.35 64.40±6.12 41.91±3.76 65.09±3.96 27.73±1.75 46.62±2.89 18.59±1.25 65.21±3.64
IR055 41.00 69.75±4.24 18.88±3.18 15.00±2.35 91.82±15.20 73.93±11.51 80.60±6.92 21.90±1.50 34.27±2.78 24.28±1.63 58.55±4.41
IR078 39.00 75.44±2.85 17.60±2.49 16.75±1.71 60.21±5.71 50.51±5.52 83.90±4.86 21.22±1.57 34.02±2.27 17.94±1.26 51.96±4.01
IR092 38.00 69.34±4.72 16.78±1.32 14.75±1.35 57.22±4.12 41.53±3.77 72.57±3.67 26.78±1.84 36.51±2.91 16.39±1.21 52.91±3.70
IR096 38.00 97.13±5.94 17.49±1.94 16.13±2.53 55.10±5.48 42.37±4.01 76.92±4.07 25.98±1.39 11.16±1.05 17.75±0.85 28.91±1.90
IR104 36.00 72.09±4.37 17.63±1.81 13.73±0.67 80.91±8.48 67.09±4.46 82.90±3.50 21.22±0.93 37.47±2.29 19.51±1.62 56.99±3.67
IR138 31.50 74.13±2.65 17.88±1.81 13.63±1.53 89.18±7.71 67.03±5.90 75.13±3.25 20.92±1.00 32.41±2.20 19.08±1.94 51.49±3.15
JR011 43.00 113.19±6.03 20.36±1.30 18.13±0.53 135.67±8.53 104.12±7.71 76.75±2.74 26.14±1.38 33.25±2.44 22.10±1.76 55.34±4.20
JR067 42.00 85.38±4.42 16.83±1.24 21.75±1.71 49.77±3.70 31.17±3.34 62.57±2.56 24.06±1.62 51.16±3.12 16.28±0.27 67.44±3.15
JR082 39.00 70.38±3.59 17.27±1.71 19.13±1.18 67.58±3.15 43.27±2.07 64.02±2.09 27.02±1.37 45.71±2.15 22.35±2.97 68.06±6.12
JR101 30.00 79.00±4.95 13.90±1.14 18.25±1.35 65.12±4.05 51.70±5.00 79.37±3.88 25.78±1.40 35.28±2.43 24.32±1.31 59.60±3.74
JR102 30.00 77.38±3.88 15.43±1.46 21.38±2.18 62.28±5.29 40.75±4.41 65.48±5.22 25.60±1.39 32.19±2.50 22.29±1.16 54.48±3.66

Table 3

Correlation analysis of yield components and yield of high-yield rice germplasms"

性状Trait 头季稻产量Yield of main crop 再生季稻产量Yield of ratoon rice
显著水平
Significance level		 相关性
Pearson coefficient		 显著水平
Significance level		 相关性
Pearson coefficient
每穴有效穗数Effective panicles per hole 0.000 0.685** 0.001 0.678**
每穗颖花数Spikelets per panicle 0.000 0.884** 0.000 0.767**
每穗实粒数Grains per panicle 0.000 0.887** 0.000 0.835**
千粒重1000-grain weight 0.223 -0.172** 0.912 -0.012**
结实率Setting rate 0.014 0.248** 0.000 0.591**

Table 4

Path analysis of yield components of high-yield rice germplasms"

因素
Factor		 直接通径系数Directly path coefficient
头季稻产量
Yield of main crop		 再生季稻产量
Yield of ratoon rice
每穴有效穗数
Effective panicles per hole		 0.85 0.78
每穗颖花数
Spikelets per panicle		 0.98 0.92
每穗实粒数Grains per panicle 0.48 0.63
千粒重1000-grain weight 0.09 0.22
结实率Setting rate 0.52 0.47

Table 5

Correlation analysis between the yield of main crop, yield of ratoon rice and total yield"

属性Attribute 高产种质High-yield germplasm 全部种质Total germplasm
再生季稻产量
Yield of ratoon rice		 两季稻总产量
Total yield		 再生季稻产量
Yield of ratoon rice		 两季稻总产量
Total yield
头季稻产量Yield of main crop -0.428** 0.791** 0.147* 0.919**
再生季稻产量Yield of ratoon rice 0.259* 0.525**
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