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http://dx.doi.org/10.7740/kjcs.2022.67.2.077

Effects of Water-deficit Stress on Yield and Chlorophyll Fluorescence in Rice during the Early Tillering Stage  

Han, Chae-Min (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services)
Shin, Jong-Hee (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services)
Kwon, Jung-Bae (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services)
Won, Jong-Gun (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services)
Kim, Sang-Kuk (Gumi Floriculture Research Institute)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.67, no.2, 2022 , pp. 77-84 More about this Journal
Abstract
This study aimed to evaluate the growth, yield, and grain quality characteristics of rice varieties that were subjected to water stress during the tillering stage. We also sought to identify whether water stress could be indicated via the plants' response to chlorophyll fluorescence. In this study, we induced water stress by intentionally cutting off water for 30 days, starting 15 days after transplanting the rice varieties to a greenhouse. We analyzed nine rice varieties, including Ilpum, which is the most frequently cultivated variety in Gyeongsangbuk-do, South Korea. The control group was planted in a paddy field where irrigation was entirely dependent on rainfall. Our results revealed that the heading stage of the nine studied varieties occurred approximately ten days earlier in the rain shelter than in the field. Moreover, the rice yield, head rice rate, and palatability score decreased by 18.6%, 17.1%, and 8.3%, respectively, while protein content increased by 20.2% compared with the control group. The Saenuri and Haimi varieties showed the lowest reduction in yield under the water stress conditions, while the Daebo and Samkwang varieties showed the highest reduction in yield. The chlorophyll fluorescence response after re-irrigation was measured between July 30th and August 17th. The ratio of variable fluorescence to maximum chlorophyll fluorescence (FV/FM) values failed to recover to their baseline values, resulting in either no change or a reduction in fluorescent response, even after re-irrigation of Daebo and Samkwang varieties. These results can be utilized as empirical data for drought-affected farms to select resistant varieties that can respond to spring drought in the southern plains of Gyeongsangbuk-do.
Keywords
chlorophyll fluorescence; drought; rice; water stress;
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