Genotypic Veriability in Core Collection of Bread Wheat Genotypes for Drought and Heat Tolerance [With CD Copy] PDF Download
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![Genotypic Veriability in Core Collection of Bread Wheat Genotypes for Drought and Heat Tolerance [With CD Copy] PDF](https://books.google.com/books/content/images/frontcover/_C3GzgEACAAJ?fife=w150-h200)
Author: Suresh
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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![Genotypic Veriability in Core Collection of Bread Wheat Genotypes for Drought and Heat Tolerance [With CD Copy] PDF](https://books.google.com/books/content/images/frontcover/_C3GzgEACAAJ?fife=w80-h100)
Author: Suresh
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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Book Description
![Evaluation of Bread Wheat Genotypes for Drought and Heat Tolerance Under Field Conditions [With CD Copy] PDF](https://books.google.com/books/content/images/frontcover/S23SzgEACAAJ?fife=w80-h100)
Author: kumar K G Madhu
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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![Physiological Characterization of Bread Wheat Genotypes for Heat Tolerance [With CD Copy] PDF](https://books.google.com/books/content/images/frontcover/49zDzgEACAAJ?fife=w80-h100)
Author: Bhupnesh
Publisher:
ISBN:
Category :
Languages : en
Pages : 49
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![Characterization of Bread Wheat ( Triticum Aestivum L. ) Genotypes for Terminal Heat Tolerance. [ With CD Copy ] PDF](https://books.google.com/books/content/images/frontcover/2LEs0AEACAAJ?fife=w80-h100)
Author: Vishal Saini
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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![Screening of Bread Wheat Genotypes for Terminal Heat Tolerance [ With CD Copy ] PDF](https://books.google.com/books/content/images/frontcover/ig7KzgEACAAJ?fife=w80-h100)
Author: Darya Khan Akbarzai
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Author: Bruno Bouffier
Publisher:
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Category :
Languages : en
Pages : 0
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A stagnation of wheat yield was reported in France and other countries worldwide since the 1990's, which incriminated mainly drought and heat stress. Improving the European wheat tolerance to them is of first importance. This study aimed to investigate the genetic determinism of the tolerance to such stresses. Three CIMMYT bread wheat populations combining complementary heat and drought adaptive habits were grown in Northern Mexico under irrigated, drought and heat-irrigated treatments from 2011 to 2013. The trial network comprised 15 trials and both physiological and agronomic traits were scored. First, an environmental characterization methodology was developed and resulted in the identification of six main environmental scenarios in the network. A representative environmental covariate was extracted from each of them. Then, a factorial regression model leaded to the dissection of the genotype-by-environment interaction and highlighted differential stress sensitivity of the germplasm. Finally, a multi-environmental QTL detection resulted in the discovery of genomic regions involved in the control of both physiological and agronomic traits and the study of their sensitivity to the environment. From the environmental characterization to the QTL detection, this study resulted in the development of a tool for breeders which may enable the evaluation of the potential of any genotypes in front of a range of environment, but also the identification of genomic regions involved in the control of the tolerance to drought and heat stress in bread wheat. This may help in improving the tolerance of the European bread wheat germplasm to drought and heat stress.
![Studies on Genetic Variability for Drought Tolerance in Advance Lines of Wheat (Triticum Aestivum L. Em. Thell) [With CD Copy] PDF](https://books.google.com/books/content/images/frontcover/fG7UzgEACAAJ?fife=w80-h100)
Author: Nithya P Arun
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
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![Variability and Association Among Morpho Physiological Traits Associated with Heat Tolerance in Bread Wheat (Triticum Aestivum L.) [With CD Copy] PDF](https://books.google.com/books/content/images/frontcover/BPw8nQAACAAJ?fife=w80-h100)
Author: Anzer UL Islam
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Author: Kiran Baral
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659155666
Category :
Languages : de
Pages : 116
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Book Description
Nepal is under the effect of climate change and faces drought and heat stress in wheat growing season. Adoption of improved varieties has replaced the indigenous wheat germplasms which has narrowed the genetic base. This has resulted in genetically vulnerable situation. Due to this there is a chance of epidemic outbreak in biotic and abiotic stresses which will cause a significant loss in wheat production. For this new and diverse genes should be identified and combined. Forty genotypes were tested under irrigated, drought and heat stress conditions with Fourteen physio-morphological traits used for the study. Highly Significant variation among the genotypes was found for the traits under study. Paired t-test was conducted to determine statistical differences among stress and non-stressed environments. Phenological period was reduced under drought and heat stress conditions. SPAD, Canopy temperature and relative water content made selection under stress effective. Variablity study and PCA based on morpho-physiological traits gave clear differences in the genotypes used which could be used to select for the drought and heat stresses.
Author: Dion Bennett
Publisher:
ISBN:
Category : Plants
Languages : en
Pages : 280
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This study was conducted with the aim of improving our understanding of the genetic basis of the superior grain yield of an elite bread wheat breeding line, RAC875, under drought and heat stressed Mediterranean-type climates in southern Australia. Here, these abiotic stresses present a significant barrier to production. Kukri is a locally adapted variety which achieves acceptable grain yield under more favourable conditions, but relatively low grain yields under severe stress. A cross between the two lines resulted in an F1 derived doubled haploid population consisting of 368 individuals. The population was initially used for the genetic dissection of time to ear emergence and flag leaf glaucousness, with the latter trait hypothesised to explain a significant proportion of RAC875's relative drought and heat tolerance. Whilst parents of the population achieved similar time to ear emergence, segregation for Ppd-B1 and Ppd-D1a created large variation for this trait within the population. Two novel minor loci were detected for time to ear emergence (Q.Eet.aww-1A and Q.Zad.aww-4A), in addition to another eight known, minor loci. Five novel loci were detected for flag leaf glaucousness (Q.W.aww-3A, Q.W.aww-3B, Q.W.aww-3D, Q.W.aww-4D and Q.W.aww-5B), with one in particular (Q.W.aww-3A) accounting for up to 52 percent of the genetic variance for this trait. Sixteen field experiments were sown across southern Australia between 2006 and 2010, where average site grain yields ranged from 314 to 5275 kg ha−1. Kernels per square metre was the trait most correlated with grain yield, while spikelet fertility, which had a significant positive correlation with grains per square metre in all experiments and the subsequently derived environment clusters, was also related to grain yield. Nine loci were detected for grain yield independent of time to ear emergence and plant height. Five of these loci co-located with loci for kernels per square metre and only one of these nine loci were associated with any of the loci for flag leaf glaucousness and this genetic effect was opposite (i.e. Kukri allele resulting in large glaucousness value and lower grain yield). The RAC875 allele at QTL on chromosomes 1B and 7A (Q.Yld.aww-1B and Q.Yld.aww-7A-2) was associated with greater grain yield, kernels per spikelet and kernels per square metre. These two loci were detected in environment clusters where heat stress was a differentiating factor and it was concluded that these may therefore be associated with heat stress tolerance. Another QTL of large effect was consistently detected on chromosome 6A (Q.Tkw.aww-6A), with the RAC875 allele positively affecting grain size, flag leaf width and stem water soluble carbohydrate content but resulting in lower kernels per spikelet and therefore kernels per square metre. Experiments were also sown to assess the performance of the population in north-west Mexico under well watered, high yield potential conditions, as well as drip irrigated drought treatment and late planted but well watered conditions to expose the experiments to heat stress. This resulted in three very distinctive treatments and subsequently detected different genetic regions controlling grain yield. Two distinct QTL were detected for grain yield and canopy temperature on chromosome 3B, under irrigated (Q.Yld.aww-3B-1) and irrigated, drought and heat stressed treatments (Q.Yld.aww-3B-2). The latter QTL accounted for up to 22 percent of the genetic variance for grain yield and 20 percent of the genetic variance for canopy temperature under the heat stress treatment. However, all three treatments failed to detect any major QTL of common effect to southern Australia. This study highlighted the complex genetic basis of grain yield and physical grain quality in drought and heat stressed conditions, as well as the importance of conducting QTL dissection in the target environment. However, key loci detected offer potential for marker development and deployment of marker assisted selection within wheat breeding programmes targeting southern Australia. In the longer term, this should help improve the rate of genetic gain for grain yield, increasing production by growers in the Mediterranean type climate of southern Australia.
