Abstract
Direct-seeded rice is often affected by water accumulation caused by uneven soil preparation in the field after sowing and is vulnerable to flooding. Thus, it is important to select submergence-tolerant rice varieties to guarantee seedling development of direct-seeded rice. Twelve hybrid rice varieties were used to study the effects of different flooding days on germination and seedling growth. The evaluation of submergence tolerance and the selection of submergence-tolerant varieties were conducted using principal component analysis. The results showed that the germination potential, germination rate, leaf age, root number, radicle length, seedling height, leaf area, and the dry weight of aboveground and underground parts of direct-seeded rice were decreased, while the root–shoot ratio was increased. The germination potential, germination rate, leaf age, root number, radicle length, seedling height, leaf area, aboveground and underground dry weight of direct-seeded rice decreased with an increase of flooding days, while the root–shoot ratio increased. The comprehensive evaluation function was obtained by principal component analysis. Using the total value of the comprehensive evaluation as an index, three varieties with strong submergence tolerance, Nei5you768, Chuankangyousimiao, and Shen9you28, were selected. The growth of direct-seeded rice was not affected by flooding stress and damage to rice increased with an increase of flooding days. Three rice varieties with strong submergence tolerance at the seedling stage were selected. This study can serve as a reference for rice variety breeding and production.
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Acknowledgements
The authors are grateful for financial support from the Sichuan Province Science and Technology Achievement Transfer and Transformation Demonstration Project. Project Number: 2022ZHCG0106. In 2022, the central government guided the local science and Technology Development Project: integrated and industrialized application of high-efficient cultivation techniques of yuehe silk seedling series direct-seeded rice. National Key R&D Program “Research and Model Construction of Rice Stress Resistant, High Yield and Efficiency Improvement Technology in Hilly Areas”. Project Number: 2017YFD0301706, National Key R&D Program "Integration and Demonstration of Mechanized Production Technology of Hybrid Middle Rice with Wheat (Oil) Stubble in Southern Sichuan. Project Number: 2018YFD0301202-03, Southwest University of Science and Technology Doctoral Fund. Project Number: 21zx7145.
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Zhang, R., Zhou, N., Zhou, L. et al. Effects of submergence stress on germination and seedling growth of direct-seeded rice and evaluation of submergence tolerance. Paddy Water Environ 21, 523–538 (2023). https://doi.org/10.1007/s10333-023-00945-7
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DOI: https://doi.org/10.1007/s10333-023-00945-7