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New Cultivar Developed

열대 적응형 조숙 다수성 단교잡종 옥수수 ‘케이엠2’

배환희1, 신성휴1,*, 고영삼1, 하준영1, 최유찬1, 손재한1, 정태욱1, 백성범1, 김정태1, 이진석2, 손범영1, 김기영1

KM2: a Tropical Single Cross Corn Hybrid with Early Mature and High Grain Yield

Korean Journal of Breeding Science 2021;53(2):140-144.
Published online: June 1, 2021

1농촌진흥청 국립식량과학원

2농촌진흥청

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

2Rural Development Administration, Jeonju, 54875, Republic of Korea

*Corresponding Author (E-mail: shin2004@korea.kr, Tel: +82-31-695-4038, Fax: +82-31-695-4029)
• Received: March 25, 2021   • Revised: March 25, 2021   • Accepted: May 14, 2021

Copyright © 2021 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

Citations to this article as recorded by  Crossref logo
  • ‘KM3’: A Tropical Early-Maturing and High Grain Yield Single Cross Corn Hybrid
    Hwan-Hee Bae, Jun Young Ha, Young-Sam Go, Jae-Han Son, Gibum Yi, Yoo-Chan Choi, Hi-Che Chung, Seong-Hyu Shin, Ki-Young Kim, Tae-Wook Jung
    Korean Journal of Breeding Science.2024; 56(2): 139.     CrossRef
  • ‘KM5’: A High Grain Yield Hybrid Corn for Export to Tropical Regions
    Hwan-Hee Bae, Jun Young Ha, Young-Sam Go, Jae-Han Son, Gibum Yi, Yoo-Chan Choi, Hi-Che Chung, Seong-Hyu Shin, Ki-Young Kim, Tae-Wook Jung
    Korean Journal of Breeding Science.2024; 56(2): 131.     CrossRef

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KM2: a Tropical Single Cross Corn Hybrid with Early Mature and High Grain Yield
Korean. J. Breed. Sci.. 2021;53(2):140-144.   Published online June 1, 2021
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Korean. J. Breed. Sci.. 2021;53(2):140-144.   Published online June 1, 2021
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KM2: a Tropical Single Cross Corn Hybrid with Early Mature and High Grain Yield
Image Image Image
Fig. 1 Breeding procedure of ‘KM2’.
Fig. 2 Plant type and ear appearance of ‘KM2’ and ‘LVN10’
Fig. 3 Comparison of grain yield (kg 10a-1) between ‘KM2’ and the leading cultivar of the country where adaptability trials were performed (2016~2017, Vietnam, Cambodia and Indonesia). Error bar is standard deviation (n=6). Bracket, ( ) means grain yield index of ‘KM2’ compared to that of the leading cultivar.
KM2: a Tropical Single Cross Corn Hybrid with Early Mature and High Grain Yield

Inherent characteristics of ‘KM2’ (2017, Vietnam).

Hybrid Color of silk Color of tassel Color of seed coat Type of grain
KM2 Purple Light purple Yellow Intermediate
LVN10 Dark purple Purple Yellow Flint-like

Agronomic characteristics of ‘KM2’ (2016~2017, Vietnam).

Hybrid Days to silking (days) Stem length (cm) Ear height ratio (%) Ear characteristics 100-kernel Weight (g)
Length (cm) Width (cm) Tip-fill (%)
KM2 63 165 37 16.1 4.8 93 29.9
LVN10 73 165 49 17.0 4.4 91 31.9
t-Valuez 2.94* 0.01ns 4.31** 1.19ns 2.25* 0.69ns 0.75ns

Disease and lodging occurrence of ‘KM2’ in country adaptability trials (2017, Vietnam, Cambodia and Indonesia).

Hybrid Disease occurrence(0~9)z Lodging occurrence
(1~9)y
Southern leaf blight Downy mildew Rust
KM2 3 0 5 2
LVN10 3 1 4 1
CP888 2 1 - 1
P21 2 0 2 -

Starch and protein contents in grain of ‘KM2’ in country adaptability trials (2016, Vietnam, Cambodia and Indonesia)

Hybrid Starch (%) Protein (%)
KM2 71.9 9.1
LVN10z 71.1 8.7
CP888z 62.2 9.3
P21z 73.1 9.0
Table 1 Inherent characteristics of ‘KM2’ (2017, Vietnam).
Table 2 Agronomic characteristics of ‘KM2’ (2016~2017, Vietnam).

zns, * and ** indicate not significant, significantly different at p≤0.05 and p≤0.01, respectively.

Table 3 Disease and lodging occurrence of ‘KM2’ in country adaptability trials (2017, Vietnam, Cambodia and Indonesia).

zSouthern 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%~

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

Table 4 Starch and protein contents in grain of ‘KM2’ in country adaptability trials (2016, Vietnam, Cambodia and Indonesia)

zLVN10, CP888, and P21 are the leading corn variety of Vietnam, Cambodia, and Indonesia, respectively.