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Grain yield and quality traits of rice (Oryza sativa L.) cultivars under intermittent drought and contrasting temperatures

physiological, biochemical and molecular characterisation

Mukamuhirwa, Alphonsine (2019). Grain yield and quality traits of rice (Oryza sativa L.) cultivars under intermittent drought and contrasting temperatures. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2019:34
ISBN 978-91-7760-386-3
eISBN 978-91-7760-387-0
[Doctoral thesis]

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Rice (Oryza sativa) has evolved in a semi-aquatic tropical environment and therefore thrives better in a water intensive system and optimal temperature between 25 and 30°C. With the future climate change, frequent droughts and heat stress are predicted to happen simultaneously in field but little is known about their combined effects on rice productivity and quality. This thesis investigated the effects of high temperature combined with recurring drought at different stages of plant development and identified quantitative trait loci associated with drought tolerance. Drought sensitivity, growth characteristics, grain yield and its component traits, and grain quality traits were also evaluated in seven rice cultivars grown in Rwanda.

The results showed that grain yield was strongly influenced by the number of panicles per plant and spikelet fertility. A combination of high temperature and repeated drought at seedling and tillering stages dramatically limited panicle development, whereas spikelet fertility was negatively affected by drought at the reproductive stage. Grain yield was reduced by 30% to 100% as a result of drought and temperature stress as compared with well-watered control conditions.

Quantitative trait loci (QTL) for number of panicles per plant were found on chromosomes 1, 4, and 8 whereas QTL for spikelet fertility were located on chromosomes 1, 5 and 9. Four QTL each were found for grain yield after drought at seedling stage (located on chromosomes 1, 4, 7, 9) and for grain yield after drought at tillering stage (located on chromosomes 6, 8, 11, and 12). These QTL could be introgressed into elite cultivars for improvement of their adaptation to intermittent drought.

The cultivars displayed genetic diversity in their tolerance to stresses and quality characteristics. ‘Intsindagirabigega’ and ‘Jyambere’ were adapted to high temperature site conditions. ‘Intsindagirabigega’ had the highest amylose content. ’Ndamirabahinzi’ and ‘Mpembuke’ were rich in total phenolic and total antioxidant capacity, and displayed a beneficial stress memory. ‘Jyambere’ had high total protein content and high content in mineral elements together with ‘Nemeyubutaka’ and ‘Ingwizabukungu’.

The results in this thesis indicate potential for developing resilient, high-yielding and nutritionally rich rice cultivars that can be grown in stressful environments.

Authors/Creators:Mukamuhirwa, Alphonsine
Title:Grain yield and quality traits of rice (Oryza sativa L.) cultivars under intermittent drought and contrasting temperatures
Subtitle:physiological, biochemical and molecular characterisation
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2019
Number of Pages:52
IMukamuhirwa, A*., Hovmalm, H.P., Ortiz, R., Nyamangyoku, O., Johansson, E. (2018). Quality and grain yield attributes of Rwandan rice (Oryza sativa L.) grown in a biotron applying two NPK levels. Journal of Food Quality, 2018, doi.org/10.1155/2018/5134569
IIMukamuhirwa, A*., Hovmalm, H.P., Bolinsson, H., Ortiz, R., Nyamangyoku, O., Johansson, E. (2019). Concurrent drought and temperature stress in rice—a possible result of the predicted climate change: effects on yield attributes, eating characteristics, and health promoting compounds. International Journal of Environmental Research and Public Health 16, 1043; doi:10.3390/ijerph16061043
IIIMukamuhirwa, A*., Hovmalm, H.P., Ortiz, R., Nyamangyoku, O., Prieto–Linde, M.L., Ekholm, A., Johansson, E. Effect of intermittent drought on grain yield and quality of rice (Oryza sativa L.) grown in Rwanda (submitted)
IVMukamuhirwa, A*., Hovmalm, H.P., Ortiz, R., Nyamangyoku, O., Saripella, G.V., Chawade, A., Johansson, E. Quantitative trait loci for grain yield and its components under drought at different development stages of rice (Oryza sativa L.) (manuscript).
Place of Publication:Alnarp
Publisher:Swedish University of Agricultural Sciences, Department of Plant Breeding
ISBN for printed version:978-91-7760-386-3
ISBN for electronic version:978-91-7760-387-0
Publication Type:Doctoral thesis
Article category:Other scientific
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:Oryza sativa, cultivar, drought,, quality, quantitative trait loci, Rwanda, temperature,, yield
Permanent URL:
ID Code:16110
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: SLUpub Connector
Deposited On:02 May 2019 13:47
Metadata Last Modified:07 Sep 2020 03:37

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