Wheat EST resources for functional genomics of abiotic stress

Houde, Mario; Belcaid, Mahdi; Ouellet, François; Danyluk, Jean; Monroy, Antonio F.; Dryanova, A.; Gulick, Patrick J.; Bergeron, Anne; Laroche, André; Links, Matthew G.; MacCarthy, Luke; Crosby, William L.; Sarhan, Fathey

doi:10.1186/1471-2164-7-149

Cited by 106 publications

(44 citation statements)

References 80 publications

(55 reference statements)

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“…Larger ice crystals increase the possibility of physical damage within frozen plant tissue (Griffith et al 1997). AFPs also exhibit a property of thermal hysteresis and are frequently synonymous with thermal hysteresis proteins (THPs) (Guy 1999;Houde et al 2006). The activity of AFPs is present only in the apoplastic extracts of freezing tolerant monocotyledons and dicotyledons after CA.…”

Section: Antifreeze Proteinsmentioning

confidence: 98%

What happens in plant molecular responses to cold stress?

2010

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Low temperature is one of the major abiotic stresses limiting the productivity and the geographical distribution of many important crops. Many plants increase in freezing tolerance in response to low temperatures. This phenomenon needs a vast reprogramming of gene expression which results in the adjusted metabolic-structural alterations. However, the efficient adjustments are dependent on proper cold signal transduction. The first stage is cold stress signal perception which is carried out by different pathways. Transcriptional cascades are next players which operate through ABA-dependent and ABA-independent pathways to induce cold-regulated (COR) gene expression and the result is increasing in the levels of hundreds of metabolites, which some of them are known to have protective effects against the damaging effects of cold stress and some like soluble sugars, reactive oxygen species and photosynthetic metabolites are thought to act as signaling molecules and regulate special COR genes. The different aspects of these events are discussed in detail below.

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Section: Antifreeze Proteinsmentioning

confidence: 98%

What happens in plant molecular responses to cold stress?

2010

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“…Finally, the group 6 and 7 DArT markers lie in bins containing genes encoding senescence related proteins and membrane proteins, along with catalase isozymes, oxidases and alcohol dehydrogenase (Table 4). Peroxidases (Gulen and Eris 2004), glutamate dehydrogenase (Skopelitis et al 2006), alcohol dehydrogenase (Kato-Noguchi 2001) and aldehyde dehydrogenase (Sunkar et al 2003) along with other proteins function to protect plants against various kinds of stress (Houde et al 2006). Consequently seeds expressing these enzymes more effectively may be better equipped to live longer and maintain their genetic and membrane integrity.…”

Section: Am Populationmentioning

confidence: 99%

Genetic studies of seed longevity in hexaploid wheat using segregation and association mapping approaches

et al. 2011

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Genebanks are entrusted with the storage, preservation and distribution of crop germplasm. Seed longevity is an important character in this context, but little is known regarding its genetic basis, largely because it is so strongly influenced by nongenetic factors. Here we present the outcome of a genetic dissection of seed longevity in bread wheat. We applied both a standard quantitative trait locus analysis based on segregation from a biparental cross, and an association analysis using a germplasm panel to detect marker trait associations. The latter revealed more loci than the former. Some of the genomic regions identified are known to contain genes determining spike architecture or aspects of biotic and abiotic stress responses. The results open perspectives for identification of favourable longevity alleles and the more accurate prediction of seed longevity in cereal germplasm collections.

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“…This bin includes several EST loci defining genes encoding peroxidases, sterol-4-a-methyl-oxidase and 1-3-b-glucanase, all of which are involved in abiotic stress response (Hincha et al 1997;Houde et al 2006).…”

Section: Qtl For Seedling Growthmentioning

confidence: 99%

Genetic mapping within the wheat D genome reveals QTL for germination, seed vigour and longevity, and early seedling growth

2009

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Quantitative trait loci (QTL) controlling germination, seed vigour and longevity, and early seedling growth were identified using a set of common wheat lines carrying known D genome introgression segments. Seed germination (capacity, timing, rate and synchronicity) was characterized by a standard germination test, based either on the 1 mm root protrusion (germination sensu stricto) or the development of normal seedlings. To quantify seed vigour, the same traits were measured from batches of seed exposed for 72 h at 43°C and high (ca. 100%) humidity. Seed longevity was evaluated from the relative trait values. Seedling growth was assessed both under non-stressed and under osmotic stress conditions. Twenty QTL were mapped to chromosomes 1D, 2D, 4D, 5D, and 7D. Most of the QTL for germination sensu stricto clustered on chromosome 1DS in the region Xgwm1291-Xgwm337. A region on chromosome 7DS associated with Xgwm1002 harboured loci controlling the development of normal seedlings. Seed vigour-related QTL were present in a region of chromosome 5DL linked to Xgwm960. QTL for seed longevity were coincident with those for germination or seed vigour on chromosomes 1D or 5D. QTL for seedling growth were identified on chromosomes 4D and 5D. A candidate homologues search suggested the putative functions of the genes within the respective regions. These results offer perspectives for the selection of favourable alleles to improve certain vigour traits in wheat, although the negative effects of the same chromosome regions on other traits may limit their practical use.

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Wheat EST resources for functional genomics of abiotic stress

Cited by 106 publications

References 80 publications

What happens in plant molecular responses to cold stress?

What happens in plant molecular responses to cold stress?

Genetic studies of seed longevity in hexaploid wheat using segregation and association mapping approaches

Genetic mapping within the wheat D genome reveals QTL for germination, seed vigour and longevity, and early seedling growth

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