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Responses of rice (Oryza sativa L.) genotypes to repeated drought stress under contrasting temperatures

Mukamuhirwa, Alphonsine (2016). Responses of rice (Oryza sativa L.) genotypes to repeated drought stress under contrasting temperatures. Alnarp.

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Abstract

Abstract
Rice is an important staple food crop for a large part of the world population. Rice is a good source of dietary energy and provides a good proportion of proteins and minerals.
Rice is adapted to diverse environments, although its semi-aquatic characteristic makes paddy rice producing better at high soil moisture content. Rice is largely grown in irrigated systems and drought is one of the most damaging abiotic stress factors, affecting rice growth, productivity and grain quality. Drought hinders rice growth and development and may cause yield losses up to 88% under severe drought.
Various factors including competition from other crops, urbanization and increasing water demand with a growing world population are threatening the rice production. Furthermore, increment of drought frequency and intensity together with rising temperatures due to climate changes constitute a heavy challenge to rice production.
Hence, efforts have been made to find water saving management practices in rice production as well as to breed cultivars for adaptation to drought-prone environment. Intensive studies have been carried out to understand drought adaptation mechanisms, to identify roots and leaf traits as well as quantitative trait loci associated with drought tolerance, and to select or incorporate drought adaptation traits into elite genotypes.
Breeding for highly productive cultivars showing enhanced adaptation to drought-prone environments has been hindered by the complexity of the trait and a strong genotype x environment interaction. Likewise, variability of drought occurrence in time, intensity and pattern are other constraints. The strong genotype x environment interaction makes development of mega-cultivar difficult. Thus, specific screening of cultivars adapted to certain environments, together with development of appropriate water management system is a necessity for successful rice production. Moreover, few researches have focused on combinational effects of drought and temperature on rice quality characteristics.
In Rwanda, rice is mainly produced in irrigated systems where insufficiency of water constitutes one of the limiting factors. Nevertheless, while drought frequency and temperatures are predicted to increase in the future, no research has been carried out to understand how these challenges in Rwandan rice production systems should be dealt with. In this context, the present research study proposes to evaluate the different cultivars suggested to be grown in Rwanda in order to increase the understanding related to how repeated drought and temperature influence yield and quality of rice, and to elucidate what options we have to improve adaptation to drought and high temperatures.

Authors/Creators:Mukamuhirwa, Alphonsine
Title:Responses of rice (Oryza sativa L.) genotypes to repeated drought stress under contrasting temperatures
Series/Journal:Introductory paper at the Faculty of Landscape Architecture, Horticulture and Crop Production Science (BIB14970803)
Year of publishing :23 February 2016
Number:2016:1
Page range:1-38
Number of Pages:38
Place of Publication:Alnarp
Publisher:Dept. of Plant Breeding, Swedish University of Agricultural Sciences
Language:English
Publication Type:Other
Version:Accepted version
Full Text Status:Public
Agris subject categories.:F Plant production > F62 Plant physiology - Growth and development
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:rice, drought stress, varities, genotype environment interaction, plant water relations, water management, rwanda
Keywords:Rice, Drought, temperature
URN:NBN:urn:nbn:se:slu:epsilon-e-3274
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3274
ID Code:13098
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: Mrs Alphonsine Mukamuhirwa
Deposited On:01 Mar 2016 10:06
Metadata Last Modified:01 Mar 2016 10:06

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