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New Cultivar Developed

분질배유를 지녀 건식제분 쌀가루 제조에 유리한 조생종, ‘바로미2’

하수경1, 김보경1, 황운하2, 모영준3, 정종민4, 이동규1, 김우재5, 김정주6, 정지웅1,*

Early Maturing Rice Variety “Baromi2” with a Floury Endosperm and Suitable for Dry-Milling of Rice Grain

Korean Journal of Breeding Science 2022;54(4):433-441.
Published online: December 1, 2022

1국립식량과학원 작물육종과

2국립식량과학원 재배생리과

3전북대학교 작물생명과학과

4농촌진흥청 대변인실

5농촌진흥청 국제기술협력과

6국립식량과학원 재배환경과

1Crop Breeding Division, National Institute of Crop Science, RDA, Wanju 55365, Republic of Korea

2Crop physiology and production, National Institute of Crop Science, RDA, Wanju 55365, Republic of Korea

3Department of Crop Science and Biotechnology, Jeonbuk National University, Jeonju 54896, Republic of Korea

4Spokesperson Office, Rural Development Administration, Jeonju 54896, Republic of Korea

5Technology Cooperation Bureau, RDA, Jeonju 54875, Republic of Korea

6Department of Central Area Crop Science, National Institute of Crop Science, RDA, Suwon 16429, Republic of Korea

*Corresponding Author (E-mail: jrnj@korea.kr, Tel: +82-63-238-5236, Fax: +82-63-2388-5205)
• Received: September 5, 2022   • Revised: October 11, 2022   • Accepted: October 12, 2022

Copyright © 2022 by the Korean Society of Breeding Science

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Early Maturing Rice Variety “Baromi2” with a Floury Endosperm and Suitable for Dry-Milling of Rice Grain
Korean. J. Breed. Sci.. 2022;54(4):433-441.   Published online December 1, 2022
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Korean. J. Breed. Sci.. 2022;54(4):433-441.   Published online December 1, 2022
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Early Maturing Rice Variety “Baromi2” with a Floury Endosperm and Suitable for Dry-Milling of Rice Grain
Image Image Image Image Image
Fig. 1 Pedigree diagram of ‘Baromi2’. OYT: Observational yield trial, PYT: preliminary yield trial, BVPT: basic vegetative phase trial, RYT: Replicated yield trial, LAT: Local adaptability test
Fig. 2 Genealogical diagram of ‘Baromi2’.
Fig. 3 Phenotypic comparison between ‘Baromi2(Jeonju615)’, along with the check variety, ‘Seolgaeng’.
Fig. 4 Variation in daily temperature after the heading date of ‘Baromi2’ in three different culture seasons in Jeonju(2017). HDO: heading date in ordinary planting culture, HDD: heading date in double cropping culture, HDL: heading date in late planting culture. DMXT: Daily maximum temperature, DAT: daily average temperature, DMT: daily minimum temperature.
Fig. 5 Brown rice appearances in floury endosperm rice cultivars and electron microscopy visualization of the endosperm. (A) Brown rice and its transverse section of ‘Baromi2’, ‘Suweon542’, and ‘Jopyeong’. (B) Electron microscopy observation of endosperm in ‘Baromi2’, ‘Suweon542’, and ‘Jopyeong’. The pictures were imported from Mo et al(2013a), Mo and Jeung (2020), and Jeung(2020) with minor modifications under the Creative Commons Attribution License (http://ceativecommons.org/licenses).
Early Maturing Rice Variety “Baromi2” with a Floury Endosperm and Suitable for Dry-Milling of Rice Grain

Comparison between ‘Baromi2’ and its check variety, ‘Seolgaeng’ on the major agronomic traits.

Varietyz Heading date (mm.dd) Culm length (cm) Panicle length (cm) No. of panicles /hill No. of spikelets /panicle Ratio of ripened grain(%) 1,000-grain weight of brown rice(g)
Baromi2 7.27** 76ns 23ns 11** 120** 85.7* 18.4**
Seolgaeng 8.13 76 23 14 104 90.7 21.3

Resistance reactions to blast disease.

Variety Reaction to leaf blast at blast nursery tests z Reaction to neck blast(%)y
No. of tested sites (12)x Jeonju Milyang Yesan Jinju
R (0~3) M (4~6) S (7~9) Mean
Baromi2 11 1 0 2.1 4.8 0.3 0.6 5.9
Seolgaeng 1 7 3 5.5 7.5 0.0 0.0 3.7

Reaction to bacterial blight, virus diseases, and insect pests.

Variety Bacterial blight Viral diseases(%) Resistance to insectsz
K1 K2 K3 K3a Stripe Dwarf BPH SBPH
Baromi2 R R R S R(14.7) S(72.5) S S
Seolgang S S S S S(87.5) S(87.5) S S

Basic vegetative phase(BVP) and premature heading of different rice varieties.

Variety DTH(days) BVP(days) Premature heading(%)
Register LAT(2017)
Baromi2 64 34 - 0
Suweon542 65 35 6.0(2012) -
Jopyeong 57 27 37.0(2010) 16.7
Joun 53 23 27.3(2009) 19.0
Geumo 57 27 38.0(1988) 16.7
Hwawang 65 35 0.3(2012) -
Asemi 66 36 11.1(2013) -
Asemi1 64 34 2.2(2014)
Samkwang 55 25 0(2003) -
Boramchan 51 21 0(2009) 0
Sukwang 49 19 0(2011) 0

Changes in the average and cumulative temperate during the grain filling stage.

Culture season z Variety Heading date (m.dd) BRY (kg/10a) 15 days after heading 30 days after heading 55 days after heading
DAT (℃) CTAH (℃) DAT (℃) CTAH (℃) DAT (℃) CTAH (℃) Days over 25℃ in MT(days)
Ordinary Planting Culture Baromi2 7.26 472 28.2 423 27.2 816 24.9 1,370 7
Suweon542 7.27 465 28.1 422 27.1 814 24.8 1,365 7
Jopyeong 7.23 660 28.4 426 27.3 818 25.3 1,391 10
Double Cropping Baromi2 8.11 521 26.1 392 24.2 726 22.6 1,243 0
Suweon542 8.13 466 25.7 386 23.8 715 22.3 1,224 0
Jopyeong 8.10 539 26.2 393 24.3 729 22.8 1,252 0
Late Planting Culture Baromi2 8.23 665 23.3 350 22.5 674 20.9 1,129 0
Suweon542 8.29 589 21.8 326 21.7 650 20.3 973 0
Jopyeong 8.27 635 22.2 333 21.8 655 20.4 1,022 0

Response to physiological and abiotic stresses.

Variety Premature headingy (%) Occurrence of wilting Leaf senescence at maturing Cold tolerance z Viviparous germination w (%)
Leaf discolorationx (1~9) Heading delay (day) Grain fertility (%) Phenotypic acceptability (1~9)
Baromi2 6.1ns Tolerance Normal 1 24ns 43** 6 56.3*
Seolgaeng 0.0 Tolerance Normal 1 10 27 8 25.6

Characteristics related to lodging resistance.

Variety z Plant height (cm) Length of 3rd internode (cm) Breaking resistance y (g) Fresh weight of upper portion (g) Bending momentx (g.cm) Lodging Indexw Lodging in the field (0~9)
Baromi2 99ns 13.6* 1,074* 14.8* 1,458** 136* 1
Seolgaeng 99 7.8 1,299 15.7 1,545 119 1

Characteristics related to grain shape and quality.

Variety z Brown rice Trans-lucency (1~9) Alkali digestive value (1~7) Protein content (%) Amylose content (%)
Length (mm) Width (mm) L/W ratio
Baromi2 4.94ns 2.75* 1.80ns Floury 5.1** 7.2* 16.5**
Seolgaeng 4.96 2.79 1.78 6.8 6.0 18.4

Characteristics related to milling quality.

Variety z Milling recovery ratio (%) Opaque rice grain ratio (%)
Brown/rough Milled/brown Milled/rough
Baromi2 82.3ns 86.9ns 71.6 82.2
Seolgaeng 83.1 87.1 71.5 87.2

Grain hardness and physiochemical properties of rice flour of different varieties.

Variety z Grain hardness(kg)n=50 Rice flour properties
Mean particle size (μm) Damaged starch (%) Ash (%) Protein(%) Amylose(%)
Baromi2 2.9cd 81.8c 5.6c 0.59c 6.6ns 18.0ns
Suweon542 3.3c 80.3c 5.9c 0.60c 6.5ns 18.9ns
Jopyeong 8.6a 103.1a 9.7a 0.81a 6.3ns 18.3ns
Shindongjin 9.5a 98.1a 10.5a 0.68b 7.0ns 19.1ns
Seolgaeng 5.7b 84.7bc 7.0b 0.64b 6.4ns 18.7ns
Hangaru 6.3b 89.4b 7.4b 0.64b 7.0ns 17.9ns

Summary of the yield potential evaluated during 3 (2017-2019) and 2 years (2018-2019) of local adaptability test.

Culture Seasonz Regiony Trial sites Heading date(m.dd) Milled rice yield(kg/10a) Index
Baromi2(A) Seolgaeng(Geumo) (B) Baromi2(A) Seolgaeng(Geumo) (B)
2017 2018 2019 Mean 2017 2018 2019 Mean 2017 2018 2019 Mean 2017 2018 2019 Mean 2017 2018 2019 Mean
Ordinary Planting Culture HNP Jeonju 7.26 7.28 7.29 7.27 8.16 8.17 8.12 8.15 458 347 408 404 630 500 507 546 73 69 80 74
Iksan 7.27 7.24 7.28 7.26 8.16 8.12 8.12 8.13 372 435 462 423 500 505 521 509 74 86 89 83
Naju 7.28 7.26 7.31 7.28 8.12 8.10 8.13 8.11 458 405 466 443 589 469 554 537 78 86 84 82
Mean 7.27 7.26 7.29 7.27 8.14 8.13 8.12 8.13 429 396 445 423 573 491 527 531 75 81 84 80
YNP Milyang 7.26 7.29 8.3 7.29 8.17 8.15 8.15 8.15 348 396 468 404 506 576 584 555 69 69 80 73
Grand Mean 7.26 7.26 7.30 7.28** 8.15 8.14 8.13 8.14 409 396 451 419 556 513 542 537 74 77 83 78
Late Planting Culture HNP Jeonju - 8.21 8.27 8.24 - (8.21) (8.27) (8.24) - 473 491 482 - (477) (489) (483) - (99) (100) (100)
YNP Milyang - 8.27 8.30 8.28 - (8.26) (8.28) (8.27) - 484 447 466 - (479) (487) (483) - (101) (92) (96)
MDP Suwon - 8.19 8.22 8.20 - (8.18) (8.20) (8.19) - 531 425 478 - (514) (452) (483) - (103) (94) (99)
Grand Mean - 8.22 8.26 8.24ns - (8.22) (8.25) (8.23) - 496 454 475 - (490) (476) (483) - (101) (95) (98)
Table 1 Comparison between ‘Baromi2’ and its check variety, ‘Seolgaeng’ on the major agronomic traits.

z The overall means of three years of local adaptability trials (2017~2019) were conducted at NICS, RDA, Jeonju.

Not significant (ns) in the t-test, while * and ** Significant at *p<0.05 and p<0.01, respectively

Table 2 Resistance reactions to blast disease.

zN fertilizer of blast nursery test = 240 kg/ha

yN fertilizer of neck blast = 220 kg/ha

xR: resistance, M: moderately resistance, S: susceptible.

Table 3 Reaction to bacterial blight, virus diseases, and insect pests.

z BPH(brown planthopper), SBPH(small brown planthopper).

R: resistance, S: susceptible.

Table 4 Basic vegetative phase(BVP) and premature heading of different rice varieties.

BVP was calculated by subtracting 30 days from days from sowing to heading.

DTH: days from sowing to heading, BVP: basic vegetative phase, LAT: local adaptability test.

Table 5 Changes in the average and cumulative temperate during the grain filling stage.

z Preliminary yield trials for ordinary, double cropping, and late planting culture was conducted in 2017 Jeonju.

BRY: brown rice yield DAT: Daily average temperature, CTAH: cumulative temperature after heading, MT: minimum temperature.

Table 6 Response to physiological and abiotic stresses.

zCold tolerance was evaluated by using a cold-water (17℃) irrigation nursery in Chuncheon substation, NICS.

yAnnual premature heading data of ‘Baromi2’; (’17)0.0%, (’18)17.5, (’19)1.0

xEvaluation at maximum tillering stage (1: tolerance; 9: susceptible).

wGermination rate under water-saturated incubation (17℃) for 7 days on the panicle at 40 days after pollination.

Not significant(ns) in the t-test, while * and ** significant at *p<0.05 and p<0.01, respectively.

Table 7 Characteristics related to lodging resistance.

zEvaluated under ordinary transplanting nursery conditions (2019), and the evaluation methods were based on Kim et al.(2000).

yBreaking resistance of the middle point of 3rd internode with leaf sheath.

xLength from the lower node of 3rd internode to the top of panicle × (fresh weight of upper portion + fresh weight of 3rd internode)

wBending moment / Breaking resistance×100

Not significant(ns) in the t-test, while * and ** significant at *p<0.05 and p<0.01, respectively.

Table 8 Characteristics related to grain shape and quality.

zLocal adaptability trials for ordinary culture were conducted for 3 years(2017~2019).

Not significant (ns) in the t-test, while * and ** Significant at *p<0.05 and p<0.01, respectively.

Table 9 Characteristics related to milling quality.

zLocal adaptability trial was conducted in 2019.

Not significant (ns) in the t-test, while * and ** Significant at *p<0.05 and p<0.01, respectively.

Table 10 Grain hardness and physiochemical properties of rice flour of different varieties.

zThe experiment was conducted in 2018 at the National Institute of Crop Science, Jeonju, Korea.

Not significant (ns) in the t-test, while * and ** Significant at *p<0.05 and p<0.01, respectively.

Table 11 Summary of the yield potential evaluated during 3 (2017-2019) and 2 years (2018-2019) of local adaptability test.

zLocal adaptability trials for ordinary and late planting cultures were conducted for 3(2017~2019) and 2(2018~2019) years, respectively.

yRegions are Honam plain(HNP), Yeongnam plain(YNP), and middle plain(MDP)