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New Cultivar Developed

열대지역 수출용 다수성 단교잡 종실 옥수수 ‘케이엠5’

배환희1,*, 하준영1, 고영삼1, 손재한1, 이기범2, 최유찬1, 정희채1, 신성휴3, 김기영1, 정태욱1

‘KM5’: A High Grain Yield Hybrid Corn for Export to Tropical Regions

Korean Journal of Breeding Science 2024;56(2):131-137.
Published online: June 1, 2024

1농촌진흥청 국립식량과학원

2충남대학교 농업생명과학대학

3농촌진흥청

1National Institute of Crop Science, RDA, Suwon, 16429, Republic of Korea

2College of Agriculture & Life Sciences, Chungnam National University, Daejeon, 34134, Republic of Korea

3Rural Development Administration, Jeonju, 54875, Republic of Korea

*Corresponding to Hwan-Hee BaeTEL. +82-31-695-4038FAX. +82-31-695-4029E-mail. miami9@korea.kr
• Received: March 26, 2024   • Revised: April 12, 2024   • Accepted: May 16, 2024

Copyright © 2024 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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Citations to this article as recorded by  Crossref logo
  • ‘KM7’: A High-yield Hybrid Corn for Export to Tropical Regions
    Hwan-Hee Bae, Young-Sam Go, Jun Young Ha, Jae-Han Son, Tae-Wook Jung, Jung-Tae Kim, Jin-Seok Lee, Gibum Yi, Yoo-Chan Choi, Hi-Che Chung, Seong-Hyu Shin, Ki-Young Kim
    Korean Journal of Breeding Science.2025; 57(4): 475.     CrossRef

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‘KM5’: A High Grain Yield Hybrid Corn for Export to Tropical Regions
Korean. J. Breed. Sci.. 2024;56(2):131-137.   Published online June 1, 2024
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‘KM5’: A High Grain Yield Hybrid Corn for Export to Tropical Regions
Image Image Image
Fig. 1 Breeding procedure of ‘KM5’.
Fig. 2 Plant type and ear appearance of ‘KM5’ and ‘LCH9’.
Fig. 3 Comparison of grain yields between ‘KM5’ and the leading cultivar of the country where adaptability trials were performed (2017~2018, Vietnam, Cambodia and Indonesia). Error bar is standard deviation (n=6). Bracket, ( ) means grain yield index of ‘KM5’ compared to that of the leading cultivar. ‘ns’ and ‘*’ indicate not significant and significant differences at p≤0.05 by Student’s t-test, respectively.
‘KM5’: A High Grain Yield Hybrid Corn for Export to Tropical Regions

Inherent characteristics of ‘KM5’ (2018, Vietnam).

Hybrid Color of silk Color of tassel Color of coat Type of grain
KM5 Purple Purple Red orange Flint-like
LCH9 Dark purple Purple Yellow orange Flint-like
CP888 Light purple Purple Yellow orange Flint-like
P21 Purple Purple Yellow Dent-like

Agronomic characteristics of ‘KM5’ (2017~2018, Vietnam, Cambodia, and Indonesia).

Location Hybrid Day to silking
(days)
Stem
length
(cm)
Ear height
ratio
(%)
Ear characteristics

Length
(cm)
Width
(cm)
Tip-fill
(%)
Vietnam KM5 74 195 52 18.7 4.8 97
LCH9 74 186 50 18.4 4.8 95
tsz 0.00ns 1.02ns 1.01ns 0.43ns 0.35ns 1.87ns

Cambodia KM5 55 223 56 20.6 5.0 96
CP888 57 210 60 16.5 4.3 92
ts 0.78ns 1.00ns 4.59** 8.21** 7.92** 2.41*

Indonesia KM5 59 302 51 21.0 4.9 94
P21 56 281 47 17.9 5.3 94
ts 1.52ns 2.70* 1.43ns 5.51** 3.66** 0.25ns

Disease and lodging occurrence of ‘KM5’ in country adaptability trials (2017~2018, Vietnam, Cambodia and Indonesia).

Hybrid Vietnam Cambodia Indonesia


Lodgingz Southern

leaf blighty
Downy

mildewy
Lodging Southern

leaf blight
Downy

mildew
Rusty Lodging
KM5 1 1 1 1 2 2 2 1
LCH9 1 - - - - - - -
CP888 - 1 1 1 - - - -
P21 - - - - 3 1 3 1
ts 0.01ns 0.16ns 0.06ns 0.08ns 0.30ns 0.11ns 0.32ns 0.07ns

Starch and protein contents in grain of ‘KM5’ in country adaptability trials (2018, Vietnam, Cambodia and Indonesia).

Hybrid Vietnam Cambodia Indonesia



Protein


(%)
Starch


(%)
Protein


(%)
Starch


(%)
Protein


(%)
Starch


(%)
KM5 7.2 68.0 9.7 67.1 7.8 68.6
LCH9 7.4 68.5 - - - -
CP888 - - 9.0 68.1 - -
P21 - - - - 8.2 69.9
ts 0.99ns 0.14ns 0.20ns 0.74ns 1.69ns 1.52ns
Table 1 Inherent characteristics of ‘KM5’ (2018, Vietnam).

※ ‘LCH9’ is a leading corn variety in Vietnam, ‘CP888’ is a leading corn variety in Cambodia, developed by CP Group in Thailand, and ‘P21’ is a leading corn variety in Indonesia, developed by Pioneer.

Table 2 Agronomic characteristics of ‘KM5’ (2017~2018, Vietnam, Cambodia, and Indonesia).

z‘ns’, ‘*’, and ‘**’ indicate not significant, significantly different at p≤0.05 and p≤0.01, respectively.

Table 3 Disease and lodging occurrence of ‘KM5’ in country adaptability trials (2017~2018, Vietnam, Cambodia and Indonesia).

zLodging: 1, ~10%; 3, ~30%; 5, ~50%; 7, ~70%; 9, 81%~

ySouthern leaf blight: 0, no occurrence; 1, ~1%; 3, ~10%; 5, ~20%; 7, ~40%; 9, 41%~

Downy mildew and Rust: 0, no occurrence; 1, ~1%; 3, ~10%; 5, ~30%; 7, ~50%; 9, 51%~

Table 4 Starch and protein contents in grain of ‘KM5’ in country adaptability trials (2018, Vietnam, Cambodia and Indonesia).