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내도복 복합내병 최고품질 중만생 벼 ‘예찬’

백만기1, 박현수1,*, 남정권1, 조영찬1, 김기영2, 김정주1, 김우재1, 신운철1, 정지웅1, 김춘송1, 정종민1, 이건미1, 박슬기1, 이창민1, 서정필1, 이점호1

High Grain Quality Mid-late Maturing Rice Cultivar ‘Yechan’ with Lodging Tolerance and Multiple Disease Resistance

Korean Journal of Breeding Science 2019;51(4):504-514.
Published online: December 1, 2019

1농촌진흥청 국립식량과학원

2농촌진흥청

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

2Research Policy Bureau, RDA, Jeonju 54875, Republic of Korea

* Corresponding Author (E-mail: mayoe@korea.kr, Tel: +82-63-238-5214, Fax: +82-63-238-5205)
• Received: September 21, 2019   • Revised: September 21, 2019   • Accepted: September 28, 2019

Copyright © 2019 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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High Grain Quality Mid-late Maturing Rice Cultivar ‘Yechan’ with Lodging Tolerance and Multiple Disease Resistance
Korean. J. Breed. Sci.. 2019;51(4):504-514.   Published online December 1, 2019
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High Grain Quality Mid-late Maturing Rice Cultivar ‘Yechan’ with Lodging Tolerance and Multiple Disease Resistance
Korean. J. Breed. Sci.. 2019;51(4):504-514.   Published online December 1, 2019
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High Grain Quality Mid-late Maturing Rice Cultivar ‘Yechan’ with Lodging Tolerance and Multiple Disease Resistance
Image Image Image Image
Fig. 1 Genealogical diagram of ‘Yechan’
Fig. 2 Pedigree diagram of ‘Yechan’.
Fig. 3 Plant type at maturing stage (A) and grain shape of rough, brown, and milled rice (B).
Fig. 4 Resistance reaction to leaf balst (A) and against bacterial blight races K1 (HB1013 isolate), K2 (HB1014), K3 (HB1015), and K3a (HB1009) (B). Hopyeong is the spreader cultivar for leaf blast in upland blast nursery. The white bar indicate 10 cm.
High Grain Quality Mid-late Maturing Rice Cultivar ‘Yechan’ with Lodging Tolerance and Multiple Disease Resistance

Major agronomic traits and yield components.

Cultivar Heading date (DASz) Culm length (cm) Panicle length (cm) No. of panicles per hill No. of spikelets per panicle Ratio of ripened grain (%) 1,000-grain weight of brown rice (g)
Yechan 106nsy 66** 20ns 15ns 103* 92.4ns 22.6*
Nampyeong 105 77 20 13 98 89.8 21.6

Response to physiological and abiotic stresses.

Cultivar Occurrence of wilting Leaf senescence at maturing Cold tolerancez Low tem. germinationy (%) Lodging Viviparous germinationx (%)


Seedling stage (1-9) Heading delay (day) Grain fertility (%) Phenotypic acceptability (1-9) Breaking strength (g) Index
Yechan Tolerance Late 4ns,w 12ns 17ns 7ns 51.0* 1,256** 94ns 23.0*
Nampyeong Tolerance Late 4 9 22 7 41.0 1,697 107 8.4

Resistance reaction to rice blast and bacterial blight.

Cultivar Reaction to leaf blast at blast nursery Reaction to bacterial blight


No. of tested sites (12) Race Field


R M S Mean K1 K2 K3 K3a
Yechan 3 7 1 4.2 R R R R R
Nampyeong 3 8 0 4.5 S S S S S

Reaction to virus disease and insect pests.

Cultivar Virus diseases Resistance to insects


Stripe Dwarf Black streaked dwarf BPHz SBPH
Yechan Ry S S S S
Nampyeong R M S S S

Characteristics related to grain shape and grain quality.

Cultivar Brown rice Trans- lucency (1-9) White core (0-9) White belly (0-9) Alkali digestive value (1-7) Protein content (%) Amylose content (%) Palatability of cooked rice (-3-+3)

Length (mm) Width (mm) L/W ratio
Yechan 4.95ns,z 2.88ns 1.72ns 1ns 0ns 0ns 6.3ns 5.6ns 19.0ns 0.49
Nampyeong 4.96 2.85 1.74 1 0 0 6.4 6.2 18.9 -0.27

Characteristics related to milling quality.

Cultivar Milling recovery ratio (%) Head rice milling recovery ratio (%)

Brown/rough Milled/brown Milled/rough Head rice
Yechan 82.1 90.9 74.6 95.2 71.0
Nampyeong 81.3 90.1 73.3 93.6 68.6

Yield summary of local adaptability test.

Culture season Region No. of tested sites Milled rice (MT/ha) Index


Yechan (A) Nampyeong (B) A/B
Ordinary planting West-southern coast 2 5.73 5.62 102
Honam plain 5 5.75 5.46 105
Yeongnam plain 4 6.14 5.82 105

Mean 11 5.87nsz 5.63 104ns

Double cropping Honam plain 1 5.44 5.50 100
Yeongnam plain 1 5.15 5.69 90

Mean 2 5.29* 5.59 95*
Table 1 Major agronomic traits and yield components.

DAS: days after seeding

ns, *, and ** mean no significant, significant at p<0.05, and 0.01 by t-test, respectively

Table 2 Response to physiological and abiotic stresses.

Cold tolerance was evaluated at cold water (17℃) irrigation nursery in Chuncheon substation, NICS

Germination rate for 15 days at 13℃

Germination rate for 7 days at 25℃

ns, * and ** mean no significant and significant at p<0.05, p<0.01 by t-test, respectively

Table 3 Resistance reaction to rice blast and bacterial blight.

R: Resistant, M: moderately resistant, S: Susceptible

Table 4 Reaction to virus disease and insect pests.

BPH: brown planthopper, SBPH: small brown planthopper

R: resistant, M: moderately resistant, S: susceptible

Table 5 Characteristics related to grain shape and grain quality.

ns means no significant by t-test

Table 6 Characteristics related to milling quality.
Table 7 Yield summary of local adaptability test.

ns and * mean no significant, significant at p<0.05 by t-test, respectively