Wild Relative and Transgenic Innovation for Enhancing Crop Adaptation to Warmer and Drier Climate

Gong, Xue; McIntyre, C. L.

doi:10.1002/9780470960929.ch36

Cited by 7 publications

(15 citation statements)

References 135 publications

(164 reference statements)

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“…Candidate genes for drought/heat adapted traits have been identified in the domestic gene pools of crops, for expression of osmotic adjustment, transpiration efficiency, photosynthetic resilience and levels of water soluble carbohydrates (Xue and McIntyre, 2011). However, the molecular bases of such trait expressions are often unknown, even with identification of many stress induced processes and factors, such as anti-oxidant enzymes, reactive oxygen species molecules (ROS), osmoprotectant protein stabilisers and heat shock chaperones.…”

Section: Genomics Genetic Variation and Breeding For Tolerance Of Abmentioning

confidence: 99%

“…However, the molecular bases of such trait expressions are often unknown, even with identification of many stress induced processes and factors, such as anti-oxidant enzymes, reactive oxygen species molecules (ROS), osmoprotectant protein stabilisers and heat shock chaperones. A stress associated trait may be linked to an expression change in another trait or yet to be identified biochemical process (Xue and McIntyre, 2011). In addition, acclimation of plants to stress may increase expressions of stress tolerance genes.…”

Section: Genomics Genetic Variation and Breeding For Tolerance Of Abmentioning

confidence: 99%

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Role of Plant Genetic Resources in Food Security

Redden

Upadyaya

Dwivedi

et al. 2018

Food Security and Climate Change

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Section: Genomics Genetic Variation and Breeding For Tolerance Of Abmentioning

confidence: 99%

Section: Genomics Genetic Variation and Breeding For Tolerance Of Abmentioning

confidence: 99%

Role of Plant Genetic Resources in Food Security

Redden

Upadyaya

Dwivedi

et al. 2018

Food Security and Climate Change

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“…This bottleneck limited transfer of the genetic diversity for abiotic stress tolerances from the much wider genepools of the crop progenitors and of other wild relatives. The secondary and tertiary wild relatives of crops may be rich sources of desirable traits such as disease resistance [36], yield and agronomic traits [37], or of genes for regulatory and physiological stress tolerance mechanisms [38]. The much wider genetic diversity available in wild relatives offer the possibility of a breakthrough in the apparent yield ceilings in many crop breeding programs (or reduced rates of yield gains), as demonstrated with the pyramiding of yield promoting genes in domestic tomato to achieve a 50% yield gains in both irrigated and dry field conditions [39].…”

Section: Novel Genetic Stress Tolerance From Wild Relativesmentioning

confidence: 99%

“…Stress tolerant regulatory loci occur across various species as variants of candidate genes or even as direct analogues [38,51]. Molecular tools are available to assist identification of critical genes for drought and for heat tolerance from crop wild relatives [23], such as analysis of known candidate genes, and application of comparative functional genomics in a genome wide search.…”

Section: Genomics and Control Mechanisms For Stress Tolerancementioning

confidence: 99%

“…These may be expressed by differences in protein levels or protein sequences detectable by respective mRNA levels. Drought up-regulated genes conferring resistance include dehydrins (Hordeum spontaneum), and DREB in Glycine soja [38]. However a trait associated with drought or heat stress may actually be linked to a change in expression of another trait or even of a still unknown biochemical process.…”

Section: Genomics and Control Mechanisms For Stress Tolerancementioning

confidence: 99%

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New Approaches for Crop Genetic Adaptation to the Abiotic Stresses Predicted with Climate Change

Redden¹

2013

Agronomy

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Extreme climatic variation is predicted with climate change this century. In many cropping regions, the crop environment will tend to be warmer with more irregular rainfall and spikes in stress levels will be more severe. The challenge is not only to raise agricultural production for an expanding population, but to achieve this under more adverse environmental conditions. It is now possible to systematically explore the genetic variation in historic local landraces by using GPS locators and world climate maps to describe the natural selection for local adaptation, and to identify candidate germplasm for tolerances to extreme stresses. The physiological and biochemical components of these expressions can be genomically investigated with candidate gene approaches and next generation sequencing. Wild relatives of crops have largely untapped genetic variation for abiotic and biotic stress tolerances, and could greatly expand the available domesticated gene pools to assist crops to survive in the predicted extremes of climate change, a survivalomics strategy. Genomic strategies can assist in the introgression of these valuable traits into the domesticated crop gene pools, where they can be better evaluated for crop improvement. The challenge is to increase agricultural productivity despite climate change. This calls for the integration of many disciplines from eco-geographical analyses of genetic resources to new advances in genomics, agronomy and farm management, underpinned by an understanding of how crop adaptation to climate is affected by genotype × environment interaction

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The heat shock factor family fromTriticum aestivumin response to heat and other major abiotic stresses and their role in regulation of heat shock protein genes

Gong

Sadat

Drenth

et al. 2013

EXBOTJ

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222

228

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Heat shock factors (Hsfs) play a central regulatory role in acquired thermotolerance. To understand the role of the major molecular players in wheat adaptation to heat stress, the Hsf family was investigated in Triticum aestivum. Bioinformatic and phylogenetic analyses identified 56 TaHsf members, which are classified into A, B, and C classes. Many TaHsfs were constitutively expressed. Subclass A6 members were predominantly expressed in the endosperm under non-stress conditions. Upon heat stress, the transcript levels of A2 and A6 members became the dominant Hsfs, suggesting an important regulatory role during heat stress. Many TaHsfA members as well as B1, C1, and C2 members were also up-regulated during drought and salt stresses. The heat-induced expression profiles of many heat shock protein (Hsp) genes were paralleled by those of A2 and A6 members. Transactivation analysis revealed that in addition to TaHsfA members (A2b and A4e), overexpression of TaHsfC2a activated expression of TaHsp promoter-driven reporter genes under non-stress conditions, while TaHsfB1b and TaHsfC1b did not. Functional heat shock elements (HSEs) interacting with TaHsfA2b were identified in four TaHsp promoters. Promoter mutagenesis analysis demonstrated that an atypical HSE (GAACATTTTGGAA) in the TaHsp17 promoter is functional for heat-inducible expression and transactivation by Hsf proteins. The transactivation of Hsp promoter-driven reporter genes by TaHsfC2a also relied on the presence of HSE. An activation motif in the C-terminal domain of TaHsfC2a was identified by amino residue substitution analysis. These data demonstrate the role of HsfA and HsfC2 in regulation of Hsp genes in wheat.

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Wild Relative and Transgenic Innovation for Enhancing Crop Adaptation to Warmer and Drier Climate

Cited by 7 publications

References 135 publications

Role of Plant Genetic Resources in Food Security

Role of Plant Genetic Resources in Food Security

New Approaches for Crop Genetic Adaptation to the Abiotic Stresses Predicted with Climate Change

The heat shock factor family fromTriticum aestivumin response to heat and other major abiotic stresses and their role in regulation of heat shock protein genes

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