Cited by 210Genetics and Plant BreedingRice Cultivation and Yield ImprovementPlant Disease Resistance and Genetics

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Inheritance of Root Characters and their Relations to Drought Resistance in Rice1

Ekanayake, I. J., O'Toole, J. C., Garrity, D. P., Masajo, T. M.·1985·Crop Science

DOI 10.2135/cropsci1985.0011183x002500060007x

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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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Background
Yield and Yield Attributes of Aus Rice Genotypes as Influenced by Different Levels of Water Stress
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Genetic And Dna Marker Studies For Drought Tolerance In Upland Cotton
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Background
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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
DOI: 10.2135/cropsci1985.0011183x002500060007x
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
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
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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Inheritance of Root Characters and their Relations to Drought Resistance in Rice1

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