Download or read book Genetic Studies on Terminal Heat Stress Tolerance in Wheat Triticum Aestivum L Em Thell written by Om Parkash Bishnoi and published by . This book was released on 2003 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Studies on Heat Tolerance in Wheat Triticum Aestivum L em Thell written by Puneet Jain and published by . This book was released on 2003 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Diversity and Heat Stress Tolerance Studies on Bread Wheat Tritivum Aestivum L em Thell With CD Copy written by Rutuparna Pati and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Variability Assessment for Terminal Heat Tolerance in Advance Lines of Wheat Triticum Aestivum L Em Thell With CD Copy written by Karuna and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Terminal Heat Tolerance in Bread Wheat written by Ankit Sharma and published by LAP Lambert Academic Publishing. This book was released on 2012-06 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat, an important crop and widely grown all over the world is affected by terminal heat at grain filling stage. Heat stress affects the crop at grain filling when sowing of wheat is delayed due to delay in harvest of highly remunerative preceding crops. Fast wind flow and increasing temperature causes poor grain filling by affecting the wheat physiological mechanisms affecting yield. The objectives of this investigation were to study the heat susceptibility index, correlation and the nature and magnitude of gene effects governing the yield and its components in both timely sown and late sown experiments. Breeding for Terminal Heat Tolerance is difficult owing to its complex quantitative nature. Increasing global temperature made it necessary to search for tolerant genotypes and understand the underlying nature of genes to breed effectively.

Download or read book Genetic Variability for Terminal Heat Tolerance in Advance Lines of Bread Wheat Triticum Aestivum L em Thell written by Lalit Kumar and published by . This book was released on 2021 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Diversity Analysis for Heat Tolerance in Wheat Triticum Aestivum L Em Thell With CD Copy written by Neeru and published by . This book was released on 2017 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Inheritance of Heat Tolerance in Wheat Triticum Aestivum L em Thell Using Morphological and Biochemical Parameters with Cd Copy written by Sameena Sheikh and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic and Molecular Marker Analysis for Heat Tolerance in Wheat Triticum Aestivum L Em Thell written by Nabin Bhusal and published by . This book was released on 2016 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Bread Wheat Triticum Aestivum L Genotypes for Terminal Heat Tolerance With CD Copy written by Vishal Saini and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Genetic Dissection of Drought and Heat Tolerance Related Traits in Bread Wheat Triticum Aestivum L written by Dion Bennett and published by . This book was released on 2012 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Phenotypic and Molecular Genetic Analysis of Reproductive Stage Heat Tolerance in Wheat triticum Aestivum written by Richard Esten Mason and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat stress adversely affects wheat production in many regions of the world and is particularly detrimental during reproductive development. The objective of this study was to identify quantitative trait loci (QTL) associated with improved heat tolerance in hexaploid bread wheat (Triticum aestivum). To accomplish this objective, an analysis of both the phenotypic and genetic responses of two recombinant inbred line (RIL) populations was conducted. RIL populations Halberd x Cutter and Halberd x Karl 92 (H/K) both derive heat tolerance from Halberd and segregate in their response to heat stress. A heat susceptibility index (HSI) was calculated from the reduction of three yield components; kernel number, kernel weight, and single kernel weight, following a three-day 38 degrees C heat stress treatment during early grain-filling. The HSI, as well as temperature depression of the main spike and flag leaf were used as measurements of heat tolerance. Genetic linkage maps were constructed for both populations and were used in combination with phenotypic data and statistical software to detect QTL for heat tolerance. In a comparison across the two across populations, seven common QTL regions were identified for HSI, located on chromosomes 1B, 3B, 4A, 5A, 5B, and 6D. Subsequent analysis of temperature depression in the H/K population identified seven QTL that co-localized for both cooler organ temperature and improved HSI. Four of the beneficial alleles at these loci were contributed Halberd. The genetic effect of combining QTL, including QHkw.tam-1B, QHkwm.tam-5A.1, and QHskm.tam-6D showed the potential benefit of selection for multiple heat tolerant alleles simultaneously. Analysis of the H/K population in the field under abiotic stress detected QTL on chromosome 3B and 5A, which were in agreement with results from the greenhouse study. The locus QYld.tam-3B was pleiotropic for both temperature depression and HSI in both experiments and was associated with higher biomass and yield under field conditions. The results presented here represent a comprehensive analysis of both the phenotypic response of wheat to high temperature stress and the genetic loci associated with improved heat tolerance and will be valuable for future understanding and improvement of heat stress tolerance in wheat.

Download or read book Physiological and Genetic Analyses of Post anthesis Heat Tolerance in Winter Wheat Triticum Aestivum L written by Kolluru Vijayalakshmi and published by . This book was released on 2007 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: GFD was positively correlated with TKW and negatively with GFR and maximum rate of senescence. Principle component analysis (PCA) showed kernels per spike, maximum rate of senescence, and TKW accounted for 98% of total variability among the genotypes for heat tolerance.

Download or read book Quantitative and Molecular Characterization for Heat Tolerance in Wheat Triticum Aestivum L Em Thell With CD Copy written by Anil Kumar and published by . This book was released on 2020 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Morpho physiological and SSR Markers Studies on Terminal Heat Tolerance in Bread Wheat Triticum Aestivum L Em Thell With CD Copy written by Mandeep Redhu and published by . This book was released on 2020 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Genetic Variability for Drought Tolerance in Advance Lines of Wheat Triticum Aestivum L Em Thell With CD Copy written by Nithya P Arun and published by . This book was released on 2021 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: