Inheritance of Root Characters and their Relations to Drought Resistance in Rice1
Abstract
The ability of rice plants to tolerate drought stresses is associated with root system characters. However, the genetics of root traits are not well understood. Hence, the inheritance of six root characters of rice (Oryza sativa L.) was studied using the parents, F 1, F 2, and F 3 populations of the cross IR20✕MGL‐2. Plants were grown in a hydroponic culture solution in a phytotron glasshouse and in an upland drought screening nursery. A polygenic system of inheritance was indicated for the root characters. The F 1 plants had root systems characterized by thick, deep roots with a higher lateral and vertical distribution than the low parent (IR20), and the heterosis was significant and positive. The additive and dominant genetic effects contributed equally to the expression of all root traits. Both progeny parent regression of F 3 and F 2, and the narrow sense heritability estimates in F 3 were high for root thickness (0.61 and 0.80), root dry weight (0.56 and 0.92) and root length density (0.44 0.77). Selection of root types, based on individual plant performance, should be successful in early segregating generations if selection is practiced on these characters. Associations between root characters and plant height, tiller number, and shoot weight were positive and significant. Five root characters were significantly correlated with the visual field drought resistance scores and with leaf water potential, confirming the role of root characters in maintaining high leaf water potential under water stress.
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Crops with very extensive root systems provide resistance to drought.
“thus providing resistance to drought”
From Breeding crop plants with deep roots: their role in sustainable carbon, nutrient and water sequestration (2011) · cites this paper as Ekanayake et al., 1985
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“This was supported by studies linking root thickness with drought resistance (Ekanayake et al., 1985) and quantitative trait loci (QTLs) for basal root thickness with yield in dry upland, but not wet lowland, cultivation (Champoux et al., 1995; Li et al., 2005).”
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“It was shown that vigorous growth of roots with an increase in length and thickness is correlated with drought tolerance and grain yield of rice (Ekanayake et al., 1985; Price et al., 1997).”
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Yang, Q., Zhang, F., & Li, F. (2011) · Scientia Horticulturae · doi:10.1016/j.scienta.2011.03.019 · Cited by 41 · see citing works
Comparing simple root phenotyping methods on a core set of rice genotypes
Shrestha, R., Al‐Shugeairy, Z., Alogaidi, F. F. M., Munasinghe, M., Radermacher, M., Vandenhirtz, J., & Price, A. H. (2013) · Plant Biology · doi:10.1111/plb.12096 · Cited by 41 · see citing works
Common and distinctive responses of rice seedlings to saline- and osmotically-generated stress
Bahaji, A., Mateu, I., Sanz, A., et al. (2002) · Plant Growth Regulation · doi:10.1023/a:1020979621681 · Cited by 39 · see citing works
“On the other hand, root characteristics such as thickness, depth of rooting) penetration ability and root density have been associated with drought avoidance (Ekanayoke et al. 1985; Yoshida and Hasegawa 1982; Yu et al. 1995; Zheng et al. 2000).”
BackgroundEvaluation of high yielding soybean germplasm under water limitation
Prince, S., Murphy, M., Mutava, R. N., et al. (2015) · Journal of Integrative Plant Biology · doi:10.1111/jipb.12378 · Cited by 38 · see citing works
Zhu, Z., Xu, X., Cao, B., et al. (2015) · Plant Cell Tissue and Organ Culture (PCTOC) · doi:10.1007/s11240-014-0600-7 · Cited by 38 · see citing works
“With a deep and thick root system, plants can gain better access to water in deep soil and show higher drought tolerance (Ekanayake et al. 1985; Kondo et al. 2000).”
BackgroundShafi, S., Shafi, I., Zaffar, A., Zargar, S. M., Shikari, A. B., Ranjan, A., Prasad, P. V. V., & Sofi, P. A. (2023) · Plant Stress · doi:10.1016/j.stress.2023.100211 · Cited by 37 · see citing works
Diversity for osmotic adjustment and root depth in TEF [Eragrostis tef (Zucc) Trotter]
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“The significant correlation between plant height and root depth as observed in this study was also reported for rice by Armenta-Soto et al. (1983) and Ekanayake et al. (1985).”
BackgroundThapliyal, A., Vasudevan, P., Dastidar, M. G., et al. (2011) · PubMed · Cited by 35 · see citing works
Root growth and distribution of two short-season rice genotypes
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Screening for Drought Resistance of Rice Recombinant Inbred Populations in the Field
Zou, G., Liu, H., Mei, H., et al. (2007) · Journal of Integrative Plant Biology · doi:10.1111/j.1672-9072.2007.00560.x · Cited by 35 · see citing works
Improvement of rice (Oryza sativa L.) growth in upland conditions with deep tillage and mulch
Kato, Y., Kamoshita, A., Abe, J., et al. (2006) · Soil and Tillage Research · doi:10.1016/j.still.2005.12.013 · Cited by 34 · see citing works
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Solankey, S. S., Kumari, M., Akhtar, S., et al. (2021) · Advances in olericulture · doi:10.1007/978-3-030-63497-1_2 · Cited by 32 · see citing works
- Authors
- Ekanayake, I. J., O'Toole, J. C., Garrity, D. P., & Masajo, T. M.
- Affiliations
- University of the Philippines Los Baños (PH)
- Venue
- Crop Science
- Publisher
- Wiley
- Published
- 1985-11
- Volume
- 25
- Issue
- 6
- Pages
- 927-933
- ISSN
- 0011-183X (ISSN-L)
- 1435-0653
- OpenAlex
- W2024327788
- Cited by
- 209
- References
- 0
- Citations by year
- 2025: 3 · 2024: 5 · 2023: 7 · 2022: 6 · 2021: 8 · 2020: 9 · 2019: 3 · 2018: 4 · 2017: 4 · 2016: 12 · 2015: 12 · 2014: 11 · 2013: 9 · 2012: 7
- FWCI
- 2.70
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Crop Science (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Genetics and Plant Breeding
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Rice Cultivation and Yield Improvement
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Disease Resistance and Genetics
- Keywords
- rice, drought tolerance, root traits, heredity (biology), polygenic inheritance, heterosis, narrow-sense heritability, root thickness, root dry weight, root length density, leaf water potential, plant height, tiller number
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