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http://dx.doi.org/10.7740/kjcs.2021.66.4.307

Effects of Elevated Temperature after the Booting Stage on Physiological Characteristics and Grain Development in Wheat  

Song, Ki Eun (Department of Applied Biological Science, Applied Biology (BK Plus), Gyeongsang National University)
Choi, Jae Eun (Department of Agronomy, Gyeongsang National University)
Jung, Jae Gyeong (Department of Agronomy, Gyeongsang National University)
Ko, Jong Han (Applied Plant Science, Chonnam National University)
Lee, Kyung Do (Department of Agricultural Enviroment, National Institute of Agricultural Sciences)
Shim, Sang-In (Institute of Life Sciences, Gyeongsang National University)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.66, no.4, 2021 , pp. 307-317 More about this Journal
Abstract
In recent years, global warming has led to frequent climate change-related problems, and elevated temperatures, among adverse climatic factors, represent a critical problem negatively affecting crop growth and yield. In this context, the present study examined the physiological traits of wheat plants grown under high temperatures. Specifically, the effects of elevated temperatures on seed development after heading were evaluated, and the vegetation indices of different organs were assessed using hyperspectral analysis. Among physiological traits, leaf greenness and OJIP parameters were higher in the high-temperature treatment than in the control treatment. Similarly, the leaf photosynthetic rate during seed development was higher in the high-temperature treatment than in the control treatment. Moreover, temperature by organ was higher in the high-temperature treatment than in the control treatment; consequently, the leaf transpiration rate and stomatal conductance were higher in the control treatment than in the high-temperature treatment. On all measuring dates, the weight of spikes and seeds corresponding to the sink organs was greater in the high-temperature treatment than in the control treatment. Additionally, the seed growth rate was higher in the high-temperature treatment than in the control treatment 14 days after heading, which may be attributed to the higher redistribution of photosynthates at the early stage of seed development in the former. In hyperspectral analysis, the vegetation indices related to leaf chlorophyll content and nitrogen state were higher in the high-temperature treatment than in the control treatment after heading. Our results suggest that elevated temperatures after the booting stage positively affect wheat growth and yield.
Keywords
high temperature; hyperspectral analysis; NDVI; seed development; wheat;
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