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Article

Quantitative Response of Maize Vcmax25 to Persistent Drought Stress at Different Growth Stages

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College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
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Gucheng Agro-Meteorological Field Scientific Experiment Base, Chinese Academy of Meteorological Sciences, Beijing 100081, China
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Collaborative Innovation Center on Forecast Meteorological Disaster Warning and Assessment, Nanjing University of Information Science & Technology, Nanjing 210044, China
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Joint Eco-Meteorological Laboratory of Chinese Academy of Meteorological Sciences and Zhengzhou University, Zhengzhou University, Zhengzhou 450001, China
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College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
*
Author to whom correspondence should be addressed.
Academic Editor: Maria Mimikou
Water 2021, 13(14), 1971; https://doi.org/10.3390/w13141971
Received: 24 June 2021 / Revised: 7 July 2021 / Accepted: 16 July 2021 / Published: 19 July 2021
(This article belongs to the Section Water, Agriculture and Aquaculture)
Drought stress has adverse effects on crop growth and yield, and its identification and monitoring play vital roles in precision crop water management. Accurately evaluating the effect of drought stress on crop photosynthetic capacity can provide a basis for decisions related to crop drought stress identification and monitoring as well as drought stress resistance and avoidance. In this study, the effects of different degrees of persistent drought in different growth stages (3rd leaf stage, 7th leaf stage and jointing stage) on the maximum carboxylation rate at a reference temperature of 25 °C (Vcmax25) of the first fully expanded leaf and its relationship to the leaf water content (LWC) were studied in a field experiment from 2013 to 2015. The results indicated that the LWC decreased continuously as drought stress continued and that the LWC decreased faster in the treatment with more irrigation. Vcmax25 showed a decreasing trend as the drought progressed but had no clear relationship to the growth stage in which the persistent drought occurred. Vcmax25 showed a significantly parabolic relationship (R2 = 0.701, p < 0.001) with the LWC, but the different degrees of persistent drought stress occurring in different growth stages had no distinct effect on the LWC values when Vcmax25 reached its maximum value or zero. The findings of this study also suggested that the LWC was 82.5 ± 0.5% when Vcmax25 reached its maximum value (42.6 ± 3.6 μmol m−2 s−1) and 67.6 ± 1.2% (extreme drought) when Vcmax25 reached zero. These findings will help to improve crop drought management and will be an important reference for crop drought identification, classification and monitoring as well as for the development of drought monitoring and early warning systems for other crops or maize varieties. View Full-Text
Keywords: maize; Vcmax25; persistent drought; leaf water content; quantitative relationship maize; Vcmax25; persistent drought; leaf water content; quantitative relationship
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MDPI and ACS Style

Song, X.; Zhou, G.; He, Q.; Zhou, H. Quantitative Response of Maize Vcmax25 to Persistent Drought Stress at Different Growth Stages. Water 2021, 13, 1971. https://doi.org/10.3390/w13141971

AMA Style

Song X, Zhou G, He Q, Zhou H. Quantitative Response of Maize Vcmax25 to Persistent Drought Stress at Different Growth Stages. Water. 2021; 13(14):1971. https://doi.org/10.3390/w13141971

Chicago/Turabian Style

Song, Xingyang, Guangsheng Zhou, Qijin He, and Huailin Zhou. 2021. "Quantitative Response of Maize Vcmax25 to Persistent Drought Stress at Different Growth Stages" Water 13, no. 14: 1971. https://doi.org/10.3390/w13141971

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