Next Article in Journal
To Stop Nitrogen Overdose in Soilless Tomato Crop: A Way to Promote Fruit Quality without Affecting Fruit Yield
Next Article in Special Issue
Modelling Nitrogen Uptake in Plants and Phytoplankton: Advantages of Integrating Flexibility into the Spatial and Temporal Dynamics of Nitrate Absorption
Previous Article in Journal
Simulated Assessment of Summer Maize Drought Loss Sensitivity in Huaibei Plain, China
Previous Article in Special Issue
Architectural Root Responses of Rice to Reduced Water Availability Can Overcome Phosphorus Stress
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Agronomy 2019, 9(2), 79;

Root Distribution and Its Impacts on the Drought Tolerance Capacity of Hybrid Rice in the Sichuan Basin Area of China

College of Life Science and Engineering, Southwest University of Science and Technology, Mian Yang 621010, China
Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture, Institute of Rice and Sorghum, Sichuan Academy of Agricultural Science, Deyang 618000, China
Agweathernet, Washington State University, Prosser, WA 99350, USA
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 11 January 2019 / Revised: 29 January 2019 / Accepted: 6 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Root-Soil Interactions)
Full-Text   |   PDF [1949 KB, uploaded 12 February 2019]   |  


Drought is one of the major factors limiting rice yield worldwide. A total of 46 hybrid rice varieties were chosen to investigate their root distribution and their response to drought. A field experiment was carried out in a dry shed building to evaluate the drought tolerance capacity of hybrid rice varieties on the basis of CTIRDE (complex tolerance index of rice under drought environment) values. Next, the experiment was conducted in a specially designed pot system and seed bags to analyze the root distribution and activity of antioxidant enzymes in different rice varieties. Moreover, the DEEPER ROOTING 1 (DRO1) gene was sequenced to elucidate its role in the root distribution of typical rice varieties. On the basis of CTIRDE values, the 46 hybrid rice varieties were classified as tolerant (CTIRDE ≥ 0.75), semi-tolerant (0.75 > CTIRDE > 0.65), or sensitive (CTIRDE ≤ 0.65) to drought stress. The tolerant varieties (Chuanguyou208 and Deyou4727) displayed a significantly larger length, had higher number and weight of roots in the 30–50 cm soil layer, and exhibited a significantly higher activity of Superoxide dismutase (SOD) and Peroxidase (POD) enzymes in roots during the drought stress period. The DRO1 gene sequencing results revealed that the tolerant and sensitive varieties exhibited a single-nucleotide polymorphism (SNP) in the 3-exon region, and the tolerant varieties (Chuanguyou208 and Deyou4727) exhibited a larger root growth angle with the horizontal axis, hence developing a deeper root system as compared with the other two group varieties. A significant correlation was found not only between the DRO1 gene and root distribution but also between DRO1 and the activity of SOD and POD enzymes. Conclusively, as a key feature, a deep root system enabled tolerant rice varieties (Chuanguyou208 and Deyou4727) to avoid drought stress by absorbing more water stored in deep soil layers. The root distribution, activity of POD and SOD enzymes in roots, and DRO1 gene can be used to screen tolerant rice varieties that can survive better under drought stress during the seedling stage of rice growth. View Full-Text
Keywords: rice; drought; CTIRDE; root distribution; DRO1 rice; drought; CTIRDE; root distribution; DRO1

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material


Share & Cite This Article

MDPI and ACS Style

Wang, X.; Samo, N.; Li, L.; Wang, M.; Qadir, M.; Jiang, K.; Qin, J.; Rasul, F.; Yang, G.; Hu, Y. Root Distribution and Its Impacts on the Drought Tolerance Capacity of Hybrid Rice in the Sichuan Basin Area of China. Agronomy 2019, 9, 79.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Agronomy EISSN 2073-4395 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top