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http://dx.doi.org/10.7740/kjcs.2019.64.4.422

Physiological and Proteome Responses of Korean F1 maize (Zea mays L.) Hybrids to Water-deficit Stress during Tassel Initiation  

Bae, Hwan Hee (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Kwon, Young-Sang (Environment Toxicology Research Center, Korea Institute of Toxicology)
Son, Beom-Young (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Kim, Jung-Tae (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Go, Young Sam (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Kim, Sun-Lim (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Baek, Seong-Bum (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Shin, Seonghyu (Department of Central Area Crop Science, National Institute of Crop Science, Rural Development Administration)
Kim, Sang Gon (Gyeongnam Oriental Anti-Aging Institute)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.64, no.4, 2019 , pp. 422-431 More about this Journal
Abstract
Severe droughts in spring have occurred frequently in Korea in recent years, exerting a critical impact on corn yield. Therefore, it is necessary to find physiological and/or molecular indicators of the response to drought stress in maize plants. In this study, we investigated the effects of water-deficit stress on two Korean elite F1 maize hybrids, Ilmichal and Gwangpyeongok, by withholding water for 10 days at tassel initiation. The water deficit drastically reduced the relative leaf water content, leaf number, leaf area, and stem length, leading to dry matter reduction. Moreover, it reduced the SPAD values and stomatal conductance of leaves in drought-stressed plants of both hybrids. Importantly, the number of leaves and SPAD value were non-destructive and easy to investigate in response to water-deficit stress, suggesting that they may be useful indicators for screening drought-tolerant genetic resources. We detected more than 100 spots that were differentially accumulated under drought stress. Of these spots, a total of 21 protein spots (≥1.5-fold) from drought-exposed maize leaves were successfully analyzed by MALDI-TOF-TOF mass spectrometry. Functional annotation using Gene Ontology analysis revealed that most of the identified proteins were involved in carbohydrate metabolism, stress response fatty acid catabolism, photosynthesis, energy metabolism, and transport. The protein expression levels were increased in both Ilmichal and Gwangpyeongok, except for triosephosphate isomerase, fructose-bisphosphate aldolase, and an uncharacterized protein. The lactoylglutathione lyase delta (3,5)-delta (2,4)-dienoyl-CoA isomerase was overexpressed in Gwangpyeongok only. The results obtained from this study suggest that the drought-specific genes may be useful as molecular markers for screening drought-tolerant maize genotypes.
Keywords
drought; Gwangpyeongok; Ilmichal; maize; protein expression;
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