Yield test of 41 entries, 32 new hybrids, 8 male parents restore lines and 1 inbred variety, was conducted on the farm of University of Arkansas at Pine Bluff (UAPB) in 2012. The only inbred Francis in this experiment was used as the check. Francis is a popular variety and widely used in Arkansas rice production. Results showed that the yields of 7 hybrids were 25.7% - 30.7% higher than check Francis. Hybrid 28s/BP23R had the highest yield, 10846.6 kg/hectare and over check by 30.7%. The yield of hybrid 28s/PB-24, was 10628.9 kg/hectare and over check by 28.1%. The yields of hybrid 28s/PB-22 and 33A/PB24 were 10549.8 and 10539.8 kg/hectare and over check by 27.1% and 27.0%, respectively. The sterile lines 28s, 29s, 30s and 33A have good combinability. PB2, PB5, PB12, PB22, PB23, PB24, and PB25 are good restorers and most of their hybrids were over check more than 17%. Sterile 28s has DEMG (Dominant Early Maturity Gene) which can make earlier heading hybrids by crossing with late restorer lines. Sterile 30s and 33A have no DEMG but have heat resistant gene. They can make late heading hybrids by crossing with late restorer lines PB24 and PB22 and the late heading hybrids can resistant to hot temperature. These results showed that these sterile lines, restorer lines and hybrids can be used in rice production of Arkansas in the future.
The rice heterosis (hybrid vigor) has been known for a long time in rice production and research. Rice cultural practices vary across the state and US environmental and economic times [
Different germplasms from USDA (United States Department of Agriculture) world rice collection have been utilized and accessed in the hybrid breeding at UAPB since 2008. Some new sterile line, maintain lines, restorer lines and hybrids have been screened and bred from them. The identifying and evaluating activities have generated a lot of knowledge of hybrid breeding, selected resistant varieties and developed some hybrids from this research program [
There is a period of very hot weather at the areas of Pine Bluff, Arkansas. There were 32 days with daily highest temperature over 34˚C in the 52 days from June 25-August 15 in 2012 (
The later heading hybrid rice variety also can get the higher yield if their parents have heat resistant gene. They can head normally without be hurt by high temperature. Those later heading hybrid rice varieties were from none-DEMG sterile line mating late heading restorer lines.
Based on the research objectives, we selected varieties which genotypes match up with phenotype from our previous study.
32 hybrids were made from 4 sterile line 28s, 29s ,30s and 33A by separately crossing with 8 restorer lines PB-2R, PB-5R, PB-12R, PB-21R, PB-22R, PB-23R, PB-24 and PB25. 28s came from the F5 generation of the Gobo (PI-369806)/Zhenshan 97// Xiangzaoxian No. 1///Jin23, 29s came from the F6 generation of the E425 (PI-442935)//Le- mont/Zhenshan 97, 30s came from the F5 generation of the Madagascar 342 (PI- 317514)///Lemont/you-1//IR2061, and 33A came from the B5F1 generation of Ignap
Date | Daily maximum Temperature (˚C) | Date | Daily maximum Temperature (˚C) | Date | Daily maximum Temperature (˚C) |
---|---|---|---|---|---|
6/1/2012 | 29.1 | 7/1/2012 | 37.2 | 8/1/2012 | 37.9 |
6/2/2012 | 23.5 | 7/2/2012 | 36.8 | 8/2/2012 | 36 |
6/3/2012 | 29.2 | 7/3/2012 | 33.1 | 8/3/2012 | 35.2 |
6/4/2012 | 33.7 | 7/4/2012 | 37.6 | 8/4/2012 | 36.4 |
6/5/2012 | 31.2 | 7/5/2012 | 38.1 | 8/5/2012 | 37.7 |
6/6/2012 | 27.6 | 7/6/2012 | 37.1 | 8/6/2012 | 35.6 |
6/7/2012 | 27.8 | 7/7/2012 | 38.4 | 8/7/2012 | 34.8 |
6/8/2012 | 27.2 | 7/8/2012 | 37.7 | 8/8/2012 | 35.6 |
6/9/2012 | 30.7 | 7/9/2012 | 29.1 | 8/9/2012 | 36.2 |
6/10/2012 | 30.6 | 7/10/2012 | 30.7 | 8/10/2012 | 36.4 |
6/11/2012 | 30.4 | 7/11/2012 | 30.5 | 8/11/2012 | 33.4 |
6/12/2012 | 34.2 | 7/12/2012 | 29.4 | 8/12/2012 | 29.9 |
6/13/2012 | 28.1 | 7/13/2012 | 28.7 | 8/13/2012 | 33.6 |
6/14/2012 | 28.5 | 7/14/2012 | 29.1 | 8/14/2012 | 36.2 |
6/15/2012 | 30.9 | 7/15/2012 | 29.4 | 8/15/2012 | 28.2 |
6/16/2012 | 32.1 | 7/16/2012 | 30.2 | 8/16/2012 | 30.3 |
6/17/2012 | 32.3 | 7/17/2012 | 31.8 | 8/17/2012 | 35.4 |
6/18/2012 | 32.2 | 7/18/2012 | 33.7 | 8/18/2012 | 31.3 |
6/19/2012 | 32.3 | 7/19/2012 | 35.2 | 8/19/2012 | 27.1 |
6/20/2012 | 32.8 | 7/20/2012 | 36.8 | 8/20/2012 | 28.8 |
6/21/2012 | 32.2 | 7/21/2012 | 38.7 | 8/21/2012 | 29.9 |
6/22/2012 | 33.3 | 7/22/2012 | 33.3 | 8/22/2012 | 30.5 |
6/23/2012 | 33.3 | 7/23/2012 | 32.5 | 8/23/2012 | 32.3 |
6/24/2012 | 34 | 7/24/2012 | 33.8 | 8/24/2012 | 32.2 |
6/25/2012 | 34.8 | 7/25/2012 | 34.6 | 8/25/2012 | 31.8 |
6/26/2012 | 37.6 | 7/26/2012 | 35.4 | 8/26/2012 | 31.5 |
6/27/2012 | 32.6 | 7/27/2012 | 35.8 | 8/27/2012 | 32.9 |
6/28/2012 | 35.2 | 7/28/2012 | 32.1 | 8/28/2012 | 33.6 |
6/29/2012 | 39.3 | 7/29/2012 | 37.4 | 8/29/2012 | 32 |
6/30/2012 | 38.9 | 7/30/2012 | 36 | 8/30/2012 | 34.1 |
7/31/2012 | 40.7 | 8/31/2012 | 27.6 |
Catelo (PI-373138)//II-32/Jin23. PB-2R came from the F5 generation of CDR22/ Katy/Minghui63, PB-5R came from the IR64//Katy/Guiyana 50781, PB-12 came from the Katy/Minghui63/Jasmine-85, PB-21R came from the Bengal/Minghui63/Jasmine-85, PB-22R came from the Katy/Minghui63//Gui 99, PB-23R came from the Katy/Ming- hui63//CDR210, PB-24 came from the Katy/Minghui63//Ce64, and PB-25R came from the Katy/Minghui63//IR24.
These 32 hybrids and their 8 male parents were tested for agronomic traits and yield at the farm of UAPB in 2012. Soil texture is silt loam with PH value of 5.3. The test entries were sowed at April 16 in the greenhouse and transplanted to field with 20 days old seedlings at 10 feet long, 1 foot space row, and 3 replications for each entry. Weeds were controlled with 9.3 L ha-1 of Propanil (3ʹ, 4ʹ-dichloropropionanilide) mixed with 0.4 kg∙ha−1 of quinclorac (3, 7-dichloroquinoline-8-carboxylic acid; Facet, BASF) when the rice were about four-leaf stage. Nitrogen fertilizer was applied pre-flood at 134 kg N ha−1 at about the five-leaf stage. The flood (underground water from a well) was maintained throughout the growing season. Heading dates were recorded when 50% of the plants were headed. Panicles were harvested about 40 days after heading. Plant heights were measured at harvest. Weights of 1000 grains and seed set rate were measured. Seed set rates were calculated by seeds per panicle divided by the total spikelet per panicle. Milled rice, head rice and yield were also measured. Daily maximum temperatures were recorded by the sensor of NRCS Arkansas scan sites which is 50 meters away from field of study [
The results showed that yields of 27 hybrid rice were higher, 5 hybrids were lower and 8 restore lines were higher than check Francis (
15 hybrids had yielded 20% higher than check Francis. The top 7 hybrids were 28s/PB23, 28s/PB24, 28 s/PB22, 33A/PB24, 30s/PB24, 33A/PB22, and 30s/PB23. They yielded 10846.6 kg/hectare, 10628.9 kg/hectare, 10549.8 kg/hectare, 10539.8 kg/hectare, 10490.4 kg/hectare, 10460.8 kg/hectare, and 10431.1 kg/hectare, and over CK 30.7%, 28.1%, 27.1%, 27%, 26.4%, 26%, 25.7%, respectively (
The heading date of early maturity hybrids, 28s/PB23, 28s/PB24, and 28s/PB22, were July 13 or 14 and growing days of sowing to heading were 88 or 89 days (
The heading date of check Francis was July 15 and its growing stage of sowing to heading was 90 days. The hybrids 33A/PB24, 30s/PB24, 33A/PB22, 30s/PB23, 30s/PB22,
variety | Type | date to heading | Average | Over CK (%) | Rank | ||||
---|---|---|---|---|---|---|---|---|---|
Month/date | Days to head | g/plot | Kg/H | Std Err | |||||
28s/PB23 | Hybrid | 13-Jul | 88 | 438.6 | 10846.6 | 11.1 | 30.7 | 1 | |
28s/PB24 | Hybrid | 14-Jul | 89 | 429.8 | 10628.9 | 13.6 | 28.1 | 2 | |
28s/PB22 | Hybrid | 14-Jul | 89 | 426.6 | 10549.8 | 13.3 | 27.1 | 3 | |
33A/PB24 | Hybrid | 5-Aug | 111 | 426.2 | 10539.8 | 13.6 | 27.0 | 4 | |
30s/PB24 | Hybrid | 24-Jul | 99 | 424.2 | 10490.4 | 15.0 | 26.4 | 5 | |
33A/PB22 | Hybrid | 1-Aug | 107 | 423.0 | 10460.8 | 5.1 | 26.0 | 6 | |
30s/PB23 | Hybrid | 24-Jul | 99 | 421.8 | 10431.1 | 10.0 | 25.7 | 7 | |
30s/PB22 | Hybrid | 24-Jul | 99 | 410.2 | 10144.2 | 15.9 | 22.2 | 8 | |
33A/PB25 | Hybrid | 7-Aug | 113 | 407.4 | 10075.0 | 9.3 | 21.4 | 9 | |
30s/PB25 | Hybrid | 25-Jul | 100 | 405.0 | 10015.6 | 13.8 | 20.7 | 10 | |
33A/PB12 | Hybrid | 1-Aug | 107 | 405.2 | 10020.6 | 7.3 | 20.7 | 10 | |
33A/PB2 | Hybrid | 2-Aug | 108 | 404.4 | 10000.9 | 14.9 | 20.5 | 11 | |
29s/PB22 | Hybrid | 18-Jul | 93 | 403.6 | 9981.0 | 7.9 | 20.3 | 12 | |
28s/PB12 | Hybrid | 12-Jul | 87 | 403.4 | 9976.0 | 15.4 | 20.2 | 13 | |
29s/PB5 | Hybrid | 16-Jul | 91 | 403.2 | 9971.1 | 11.9 | 20.1 | 14 | |
30s/PB5 | Hybrid | 22-Jul | 97 | 402.8 | 9950.6 | 7.9 | 19.9 | 15 | |
29s/PB24 | Hybrid | 19-Jul | 94 | 397.0 | 9817.7 | 10.3 | 18.3 | 16 | |
28s/PB25 | Hybrid | 14-Jul | 89 | 395.6 | 9783.1 | 16.4 | 17.9 | 17 | |
30s/PB2 | Hybrid | 21-Jul | 96 | 393.2 | 9723.8 | 12.9 | 17.2 | 18 | |
30s/PB12 | Hybrid | 23-Jul | 98 | 391.4 | 9679.3 | 10.3 | 16.6 | 19 | |
28s/PB5 | Hybrid | 11-Jul | 86 | 383.6 | 9486.4 | 19.0 | 14.3 | 20 | |
33A/PB23 | Hybrid | 3-Aug | 109 | 383.6 | 9486.4 | 10.0 | 14.3 | 20 | |
29s/PB2 | Hybrid | 16-Jul | 91 | 378.8 | 9367.7 | 13.0 | 12.9 | 21 | |
33A/PB5 | Hybrid | 3-Aug | 109 | 378.8 | 9367.6 | 9.5 | 12.9 | 21 | |
29s/PB12 | Hybrid | 17-Jul | 92 | 373.2 | 9229.2 | 12.4 | 11.2 | 22 | |
28s/PB2 | Hybrid | 11-Jul | 86 | 370.4 | 9159.9 | 15.1 | 10.4 | 23 | |
29s/PB25 | Hybrid | 21-Jul | 96 | 366.8 | 9071.0 | 13.6 | 9.3 | 24 | |
29s/PB23 | Hybrid | 18-Jul | 93 | 328.4 | 8121.3 | 12.7 | -2.1 | 34 | |
33A/PB21 | Hybrid | 23-Jul | 98 | 323.2 | 7992.7 | 13.0 | -3.7 | 35 | |
30s/PB21 | Hybrid | 23-Jul | 98 | 310.4 | 7676.2 | 13.7 | -7.5 | 36 | |
29s/PB21 | Hybrid | 19-Jul | 94 | 294.8 | 7290.4 | 8.4 | -12.2 | 37 | |
28s/PB21 | Hybrid | 12-Jul | 87 | 290.2 | 7176.6 | 21.3 | -13.5 | 38 | |
PB24 | Restorer (male) | 11-Aug | 117 | 358.2 | 8858.2 | 3.8 | 6.7 | 25 | |
PB12 | Restorer (male) | 2-Aug | 108 | 356.6 | 8818.7 | 4.6 | 6.3 | 26 | |
PB23 | Restorer (male) | 8-Aug | 114 | 356.2 | 8808.8 | 7.0 | 6.1 | 27 | |
PB5 | Restorer (male) | 6-Aug | 112 | 353.8 | 8749.5 | 4.4 | 5.4 | 28 | |
PB25 | Restorer (male) | 8-Aug | 114 | 349.4 | 8640.6 | 7.3 | 4.1 | 29 | |
PB2 | Restorer (male) | 7-Aug | 113 | 345.0 | 8531.9 | 14.1 | 2.8 | 30 | |
PB22 | Restorer (male) | 6-Aug | 112 | 338.8 | 8378.6 | 7.9 | 1.0 | 31 | |
PB21 | Restorer (male) | 21-Jul | 96 | 338.2 | 8363.7 | 5.8 | 0.8 | 32 | |
Francis | Inbred(CK) | 15-Jul | 90 | 335.6 | 8299.4 | 8.9 | / | 33 |
33A/PB25, 30s/PB25, 33A/PB12, 33A/PB2, and 30s/PB5 were late heading in from July 24-August 5 and their growing stage of sowing to heading were 111 days, 99 days, 107 days, 99 days, 99 days, 113 days, 100 days, 107 days, 108 days, and 97 days, respectively. They were 21 days, 9 days, 17 days, 9 days, 9 days, 13 days, 10 days, 17 days, 18 days, and 7 days later than check Francis, respectively. They headed in the highest temperature time but still had higher yields which were over check Francis 27%, 26.4%, 26%, 25.7/%, 22.2%, 21.4%, 20.7%, 20.7%, 20.5%, and 19.9%, respectively (
Restorer | Yield (kg/h) | Sterile 1 (28s) | Sterile 2 (29s) | Sterile 3 (30s) | Sterile 4 (33A) | Average Yield of Hybrids | Over Ck | Rank | |||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hybrid (♀/♂) | Yield (kg/ha) | Hybrid (♀/♂) | Yield (kg/ha) | Hybrid (♀/♂) | Yield (kg/ha) | Hybrid (♀/♂) | Yield (kg/ha) | Yield (kg/ha) | Std Err | % | |||
PB2 | 8531.9 | 28s/PB2 | 9159.9 | 29s/PB2 | 9367.7 | 30s/PB2 | 9723.8 | 33A/PB2 | 10000.9 | 9563.1 | 186.7 | 15.2 | 7 |
PB5 | 8749.5 | 28s/PB5 | 9486.4 | 29s/PB5 | 9971.1 | 30s/PB5 | 9950.6 | 33A/PB5 | 9367.6 | 9693.9 | 156.1 | 16.8 | 6 |
PB12 | 8819.0 | 28s/PB12 | 9976.0 | 29s/PB12 | 9229.2 | 30s/PB12 | 9679.3 | 33A/PB12 | 10020.6 | 9726.3 | 182.2 | 17.2 | 4 |
PB21 | 8363.7 | 28s/PB21 | 7176.6 | 29s/PB21 | 7290.4 | 30s/PB21 | 7676.2 | 33A/PB21 | 7992.7 | 7534.0 | 186.6 | -9.2 | 8 |
PB22 | 8378.6 | 28s/PB22 | 10549.8 | 29s/PB22 | 9981.0 | 30s/PB22 | 10144.2 | 33A/PB22 | 10460.8 | 10284.0 | 133.3 | 23.9 | 2 |
PB23 | 8808.8 | 28s/PB23 | 10846.6 | 29s/PB23 | 8121.3 | 30s/PB23 | 10431.1 | 33A/PB23 | 9486.4 | 9721.4 | 604.5 | 17.1 | 5 |
PB24 | 8858.0 | 28s/PB24 | 10628.9 | 29s/PB24 | 9817.7 | 30s/PB24 | 10490.4 | 33A/PB24 | 10539.8 | 10369.2 | 186.1 | 24.9 | 1 |
PB25 | 8640.6 | 28s/PB25 | 9783.1 | 29s/PB25 | 9071.0 | 30s/PB25 | 10015.6 | 33A/PB25 | 10075.0 | 9736.2 | 230.5 | 17.3 | 3 |
Average | 8643.8 | 9700.9 | 9106.2 | 9763.9 | 9743.0 | ||||||||
Std Err | 70.2 | 415.9 | 337.3 | 315.7 | 288.9 | ||||||||
Over CK (%) | 4.1 | 16.9 | 9.7 | 17.6 | 17.4 | ||||||||
Rank | 3 | 4 | 1 | 2 | |||||||||
Ck (francis) = 8299.4 Kg/Ha |
and was over CK by 17.3%. It was also over male parent PB25 by 12.7%. Hybrids from PB12 crossed with the 4 sterile lines had the forth average yield of 9726.3 kg/hectare and was over CK by 17.2%. It was also over male parent PB12 to 10.3%. Hybrids from PB23 crossed with the 4 sterile lines had the fifth average yield of 9721.4 kg/hectare and was over CK 17.1%. It was also over male parent PB23 by 10.4%. Hybrids from PB5 crossed with the 4 sterile lines had the sixth average yield was 9693.9 kg/hectare and was over CK 16.8%. It was also over male parent PB5 to 10.8%. Hybrids from PB2 crossed with the 4 sterile lines had the seventh average yield of 9563.1 kg/hectare and was over CK by 15.3%. It was also over male parent PB2 to 12.1%. Hybrids from PB21 crossed with the 4 sterile lines had the lowest average yield of 7534.0 kg/hectare and was lower CK by 9.2%. It was also 9.9% lower than male parent PB21 (
Plant heights of 32 new hybrid varieties were 105 cm - 126 cm, and their 8 restorer parents were 99 cm - 118 cm. The most hybrids were taller than the male parents. Seed set of most hybrids were 79.3% - 91.5% except the hybrids from PB21 crossed with 4 sterile lines. The seed set rate of hybrids developed from PB21 were 64.6% - 75.2% and the seed set rate of their parent PB21 was 74.8%. The milling rice of 32 new hybrids were 68.2% - 72.5% and 70.9% for check Francis. Head rice of 32 new hybrids were 48.4% - 61.7% and lower than Check Francis (62.6%). The grain weight of the 32 new hybrids were 26.6 - 32.4 g/1000 grain and over check Francis (21.3 g/1000grain) by 24.9% - 52.1% (
28s is a very good sterile line with DEMG and has good combining ablating trait with most restorers. It can be used in making early heading hybrids which can avoid the high temperature period and obtain a high yield. Heading days of its hybrids should be 86 - 89 days and about 20 days earlier than male restorer. 30s is very good sterile line with none-DEMG and has good combining ablating trait with most restorers. It can be used in making later heading hybrids which should be resistant to high temperature. The heading days of its hybrids were 97 - 100 days and 10 days earlier than male restorer. 33A is also very good sterile line with none-DEMG which can be used in making later heading hybrids which should be resistant to high temperature. The heading days of its hybrids were 108 - 113 days which as same as male restorer.
PB24 and PB22 are good restorers and have good combining ablating trait with all 4 sterile lines.
Hybrid 30s/PB5 is a short plant height hybrid (105) cm and can be used in higher fertilizer condition. The yield of 5 new hybrids 28s/12, 28s/23, 29s/PB22, 30s/PB23, and 33A/PB22 were over check Francis by 20% - 36% respectively. But their plant heights were tall (120 - 126 cm) and could be lodging. They could better be used under the low fertility condition such as organic rice field. Most of the hybrids were about 110 cm and they can adapt in not high fertility condition.
The head rice rates of most hybrids were lower. But there were still some good hybrids with higher head rice rate. The head rice rate of 28s/PB-2 was %59.9%, the head
Entry No. | Name | Type | Plant height (cm) | Seed set (%) | Milling rice (%) | Head Rice (%) | Grain Weight (g/1000 seeds) |
---|---|---|---|---|---|---|---|
1 | 28s/PB2 | hybrid | 115 | 87 | 70.2 | 59.9 | 28.5 |
2 | 28s/PB5 | hybrid | 112 | 82.2 | 68.9 | 57 | 30.1 |
3 | 28s/PB12 | hybrid | 121 | 85.6 | 71.5 | 61 | 31.4 |
4 | 28s/PB21 | hybrid | 124 | 65.9 | 71 | 59.8 | 31.5 |
5 | 28s/PB22 | hybrid | 116 | 94 | 70 | 57.7 | 30.4 |
6 | 28s/PB23 | hybrid | 124 | 91.3 | 69.1 | 57.9 | 31.1 |
7 | 28s/PB24 | hybrid | 112 | 90.8 | 70.8 | 61.7 | 29.9 |
8 | 28s/PB25 | hybrid | 112 | 84 | 72.5 | 59.5 | 27.9 |
9 | 29s/PB2 | hybrid | 117 | 85.2 | 70.5 | 58.2 | 29.6 |
10 | 29s/PB5 | hybrid | 114 | 87.2 | 70.3 | 57.2 | 30.1 |
11 | 29s/PB12 | hybrid | 112 | 81.6 | 70.4 | 59.8 | 30.5 |
12 | 29s/PB21 | hybrid | 125 | 70.4 | 69.2 | 56.6 | 30.7 |
13 | 29s/PB22 | hybrid | 122 | 87.9 | 69.6 | 56.2 | 30.6 |
14 | 29s/PB23 | hybrid | 120 | 85.5 | 68.2 | 53.9 | 31.2 |
15 | 29s/PB24 | hybrid | 116 | 86.3 | 69.5 | 54.2 | 31.2 |
16 | 29s/PB25 | hybrid | 110 | 89.1 | 68.5 | 57.9 | 29.6 |
17 | 30s/PB2 | hybrid | 115 | 79.8 | 68.5 | 56.9 | 26.6 |
18 | 30s/PB5 | hybrid | 105 | 86.3 | 67.3 | 54.6 | 28.1 |
19 | 30s/PB12 | hybrid | 120 | 83.6 | 70.7 | 59.4 | 29.1 |
20 | 30s/PB21 | hybrid | 126 | 64.6 | 68.3 | 54.2 | 30.2 |
21 | 30s/PB22 | hybrid | 115 | 92.2 | 68.3 | 55.1 | 31.1 |
22 | 30s/PB23 | hybrid | 124 | 87.4 | 68.2 | 56.9 | 30.4 |
23 | 30s/PB24 | hybrid | 110 | 89.2 | 69 | 55 | 30.3 |
24 | 30s/PB25 | hybrid | 121 | 84.4 | 69.5 | 54.7 | 30.8 |
25 | 33A/PB2 | hybrid | 119 | 83.2 | 69.8 | 56.3 | 30.4 |
26 | 33A/PB5 | hybrid | 118 | 88.7 | 69.1 | 48.4 | 30.4 |
27 | 33A/PB12 | hybrid | 111 | 78.3 | 68.2 | 56.9 | 31.4 |
28 | 33A/PB21 | hybrid | 122 | 75.2 | 68.4 | 57.6 | 30.5 |
29 | 33A/PB22 | hybrid | 121 | 84.4 | 69.5 | 54.7 | 30.8 |
30 | 33A/PB23 | hybrid | 121 | 86.6 | 69.4 | 56.8 | 30.4 |
31 | 33A/PB24 | hybrid | 124 | 84.7 | 70.3 | 56.7 | 32.4 |
32 | 33A/PB25 | hybrid | 125 | 85.6 | 70.3 | 56,2 | 31.2 |
33 | PB2 | male | 118 | 72.9 | 70.3 | 55.1 | 29.3 |
34 | PB5 | male | 103 | 75.9 | 71.4 | 56.4 | 32.6 |
35 | PB12 | male | 99 | 73.3 | 72.2 | 54.6 | 32.2 |
36 | PB21 | male | 116 | 74.8 | 69.6 | 56.2 | 28.7 |
37 | PB22 | male | 107 | 75.8 | 68.9 | 57.3 | 31.5 |
38 | PB23 | male | 115 | 75.2 | 70.3 | 54.8 | 33.8 |
39 | PB24 | male | 114 | 72.1 | 69.4 | 53.5 | 33.3 |
40 | PB25 | male | 118 | 77.4 | 70.2 | 53.7 | 31.8 |
41 | Francis(CK) | Inbred | 101 | 76.8 | 70.9 | 62.6 | 21.3 |
Planting date: April 16 |
rice rate of 28s/PB12 was 61%, the head rice rate of 28s/PB 21 was 59.8%, the head rice rate of 28s/PB24 was 61.7%, the head rice rate of 28s/PB25 was 59.5%, and the head rice rate of 29s/PB12 was 59.8%, the head rice rate of 30s/PB 12 was 59.4%. 28s was a good sterile line for hybrid rice with higher head rice rate. PB12 was a good restore line for hybrid rice with higher head rice rate. They can be used selectively in the breeding and the seed production.
Huang, B.H. and Yan, Z.B. (2016) Performance of 32 Hybrid Rice Varieties at Pine Bluff of Arkansas. Ame- rican Journal of Plant Sciences, 7, 2239-2247. http://dx.doi.org/10.4236/ajps.2016.715197