Heat and drought adaptive QTL in a wheat population designed to minimize confounding agronomic effects

Pinto, Rosenilson; Reynolds, M.P.; Mathews, Ky L.; McIntyre, C. Lynne; Olivares-Villegas, J. J.; Chapman, Scott C.

doi:10.1007/s00122-010-1351-4

Cited by 459 publications

(472 citation statements)

References 51 publications

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“…Among abiotic factors heat stress is a major production constraint for bread wheat grown in non-temperate environments (Mason et al, 2010;Pinto et al, 2010). High temperature is affecting about 65 to 70 mha in the World (Reynolds et al, 1994), around 13.5 mha area in India (Joshi et al, 2007).…”

Section: Issn: 2319-7706 Volume 6 Number 7 (2017) Pp 1914-1923mentioning

confidence: 99%

Genetic Parameters of Variability and Path Analysis in Wheat under Timely and Late Sown Conditions

ru¹,

Panwar²,

Singh³

2017

Int.J.Curr.Microbiol.App.Sci

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Section: Issn: 2319-7706 Volume 6 Number 7 (2017) Pp 1914-1923mentioning

confidence: 99%

Genetic Parameters of Variability and Path Analysis in Wheat under Timely and Late Sown Conditions

ru¹,

Panwar²,

Singh³

2017

Int.J.Curr.Microbiol.App.Sci

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“…Molecular mechanisms such as heat-shock proteins associated with hightemperature tolerance in the model plant Arabidopsis have not been shown to have a clear role in cereal grain crops (Barnabas et al 2008; see also references in Reynolds et al 2010a). However, genetic variation for canopy temperature, under high temperature conditions, has been clearly demonstrated (Pinto et al 2010). In both irrigated and dryland production, sufficient roots are required to supply the water needed for cooling aerial structures in exchange for CO 2 uptake (Trethowan and Mahmood 2011), and canopy temperature is a potential indicator of this condition (Pinto et al 2010).…”

Section: Adaptation To High Temperature and Elevated Co 2 Conditionsmentioning

confidence: 99%

“…However, genetic variation for canopy temperature, under high temperature conditions, has been clearly demonstrated (Pinto et al 2010). In both irrigated and dryland production, sufficient roots are required to supply the water needed for cooling aerial structures in exchange for CO 2 uptake (Trethowan and Mahmood 2011), and canopy temperature is a potential indicator of this condition (Pinto et al 2010). An alternative adaptation, leaf waxiness, has been demonstrated to reduce transpiration in wheat (Johnson et al 1983) and rice (Wassmann et al 2009).…”

Section: Adaptation To High Temperature and Elevated Co 2 Conditionsmentioning

confidence: 99%

Plant adaptation to climate change—opportunities and priorities in breeding

et al. 2012

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Abstract. Climate change in Australia is expected to influence crop growing conditions through direct increases in elevated carbon dioxide (CO 2 ) and average temperature, and through increases in the variability of climate, with potential to increase the occurrence of abiotic stresses such as heat, drought, waterlogging, and salinity. Associated effects of climate change and higher CO 2 concentrations include impacts on the water-use efficiency of dryland and irrigated crop production, and potential effects on biosecurity, production, and quality of product via impacts on endemic and introduced pests and diseases, and tolerance to these challenges. Direct adaptation to these changes can occur through changes in crop, farm, and value-chain management and via economically driven, geographic shifts where different production systems operate. Within specific crops, a longer term adaptation is the breeding of new varieties that have an improved performance in 'future' growing conditions compared with existing varieties.In crops, breeding is an appropriate adaptation response where it complements management changes, or when the required management changes are too expensive or impractical. Breeding requires the assessment of genetic diversity for adaptation, and the selection and recombining of genetic resources into new varieties for production systems for projected future climate and atmospheric conditions. As in the past, an essential priority entering into a 'climate-changed' era will be breeding for resistance or tolerance to the effects of existing and new pests and diseases. Hence, research on the potential incidence and intensity of biotic stresses, and the opportunities for breeding solutions, is essential to prioritise investment, as the consequences could be catastrophic. The values of breeding activities to adapt to the five major abiotic effects of climate change (heat, drought, waterlogging, salinity, and elevated CO 2 ) are more difficult to rank, and vary with species and production area, with impacts on both yield and quality of product. Although there is a high likelihood of future increases in atmospheric CO 2 concentrations and temperatures across Australia, there is uncertainty about the direction and magnitude of rainfall change, particularly in the northern farming regions. Consequently, the clearest opportunities for 'in-situ' genetic gains for abiotic stresses are in developing better adaptation to higher temperatures (e.g. control of phenological stage durations, and tolerance to stress) and, for C 3 species, in exploiting the (relatively small) fertilisation effects of elevated CO 2 . For most cultivated plant species, it remains to be demonstrated how much genetic variation exists for these traits and what value can be delivered via commercial varieties. Biotechnology-based breeding technologies (marker-assisted breeding and genetic modification) will be essential to accelerate genetic gain, but their application requires additional investment in the understanding, genetic characterisation,...

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“…Such comparative analysis should target key morphological, physiological, anatomical, and agronomic traits throughout the crop growth cycle, as water deficit stress occurs at both early (vegetative stage) and late (reproductive stage) seasons in rice (Pandey et al, 2007). Extensive research efforts are currently ongoing to reduce the impact of water deficit stress during the reproductive stage in rice (Venuprasad et al, 2008;Verulkar et al, 2010;Vikram et al, 2011;Kumar et al, 2014) and in wheat (Olivares-Villegas et al, 2007;Lopes and Reynolds, 2010;Pinto et al, 2010). Therefore, our study focused on stress during the vegetative stage to identify key checkpoints that determine whole-plant responses of representative rice cultivars adapted to lowland, upland/aerobic, or water deficit conditions and of wheat cultivars with moderate to high water deficit tolerance.…”

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Does Morphological and Anatomical Plasticity during the Vegetative Stage Make Wheat More Tolerant of Water Deficit Stress Than Rice?

et al. 2015

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District of Columbia 20005 (P.S.B.)Water scarcity and the increasing severity of water deficit stress are major challenges to sustaining irrigated rice (Oryza sativa) production. Despite the technologies developed to reduce the water requirement, rice growth is seriously constrained under water deficit stress compared with other dryland cereals such as wheat (Triticum aestivum). We exposed rice cultivars with contrasting responses to water deficit stress and wheat cultivars well adapted to water-limited conditions to the same moisture stress during vegetative growth to unravel the whole-plant (shoot and root morphology) and organ/tissue (root anatomy) responses. Wheat cultivars followed a water-conserving strategy by reducing specific leaf area and developing thicker roots and moderate tillering. In contrast, rice 'IR64' and 'Apo' adopted a rapid water acquisition strategy through thinner roots under water deficit stress. Root diameter, stele and xylem diameter, and xylem number were more responsive and varied with different positions along the nodal root under water deficit stress in wheat, whereas they were relatively conserved in rice cultivars. Increased metaxylem diameter and lower metaxylem number near the root tips and exactly the opposite phenomena at the rootshoot junction facilitated the efficient use of available soil moisture in wheat. Tolerant rice 'Nagina 22' had an advantage in root morphological and anatomical attributes over cultivars IR64 and Apo but lacked plasticity, unlike wheat cultivars exposed to water deficit stress. The key traits determining the adaptation of wheat to dryland conditions have been summarized and discussed.Among cereals, rice (Oryza sativa) and wheat (Triticum aestivum) are the most important staple food crops, and they belong to the family Poaceae. These two cereals share a common ancestor and diverged about 65 million years ago (Sorrells et al., 2003). Rice eventually developed strong adaptation potential for fully flooded conditions across tropical to temperate environments, while wheat became well adapted to aerobic conditions mostly restricted to temperate environments. Rice, with a semiaquatic behavior, consumes about 30% of the total fresh water available for agricultural crops worldwide, which equates to a 2-to 3-fold higher consumption than other cereals such as wheat and maize (Zea mays; Peng et al., 2006). Despite a significantly lower water requirement, the potential yield of wheat in a favorable environment (9 tons ha 21 ) is comparable with the yield of fully flooded rice (9 tons ha 21 ) in the dry season at the International Rice Research Institute (IRRI; Fischer and Edmeades, 2010). Hence, rice records very low water productivity compared with wheat and other dryland cereals. Because of growing concerns about water scarcity and the increased frequency and magnitude of water deficit stress events under current and future climates, increasing or even sustaining rice yield under fully flooded conditions is highly challenging. To minimize the total water requ...

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Heat and drought adaptive QTL in a wheat population designed to minimize confounding agronomic effects

Cited by 459 publications

References 51 publications

Genetic Parameters of Variability and Path Analysis in Wheat under Timely and Late Sown Conditions

Genetic Parameters of Variability and Path Analysis in Wheat under Timely and Late Sown Conditions

Plant adaptation to climate change—opportunities and priorities in breeding

Does Morphological and Anatomical Plasticity during the Vegetative Stage Make Wheat More Tolerant of Water Deficit Stress Than Rice?

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