Developing heat tolerant cultivars has become a principal breeding goal in the southern and central great plain areas of the usa. To map quantitative trait loci qtls and identify singlenucleotide polymorphism snp markers associated with seedling heat tolerance, a genomewide. Mishra and others published breeding for heat tolerance in wheat find, read and cite all the research you need on researchgate. Downscaling, heat stress, ideotype design, impact assessment, larswg weather generator, sirius wheat model. Ta hsfa4a is most similar to the class a4 hsfs from. Hti and temperature difference control for quantifying wheat heat tolerance that included the yield potential and the stability of different wheat cultivars under. Genotypes based on some potential heat tolerance indicators 1sami ullah khan, 2jalaluddin, 1ali raza gurmani, 1abdul qayyum and 1hakim khan 1department of agriculture, university of haripur, khyber pakhtunkhwa. Rapid determination of free proline for water stressed studies. Genetic variability, heritability and correlation study of. Heat tolerance evaluation of wheat triticum aestivum l. High temperature heat stress during grain filling is a major problem in most of the wheat growing areas.
Genomewide analysis of the hsp101clpb gene family for. However, confirmation and fine mapping of the identified qtls for heat tolerance have not been reported yet ye et al. Pdf breeding for heat tolerance in wheat researchgate. As a cool season crop, wheat has as an optimal daytime growing temperature during reproductive development of 15 c and for every degree celsius above this. Traits associated with high temperature tolerance can be used to develop heat tolerant cultivars in wheat. Wheat growth can be impaired by heat stress hs1 at any developmental stage, and modeling scenarios predict even warmer temperatures in the. With global climate change, heat stress is becoming an increasingly severe constraint on wheat production. Heat tolerance was determined using triphenyltetrazolium chloride cell viability assay ttc, membrane thermostability mt and dry matter accumulation. Crop science abstract heat tolerance in winter wheat. Heat stress in wheat during reproductive and grainfilling. Varaprasada andzoranristicb,d adepartment of agronomy, kansas state university, manhattan, ks 66506, usa. The objective of this study was to evaluate the effect of high temperatures on grain yield and yield components of wheat and characterize heat tolerant wheat. Because assessment of heat tolerance is an important component in breeding. Plant stress tolerance was also evaluated by ascertaining plant height, which is linked to wheat grain yield khan et al.
Evaluating a heattolerant wheat germplasm in a heat. Plant materials, growth conditions, and stress treatments. Heat tolerance, heat stress susceptibility index, spring wheat nificant yield reduction. To identify the various types of stress responses in different wheat cultivars. Characterization of heat tolerance in wheat cultivars and. Heat shock transcription factor a1b regulates heat. In this study, we focused on the unconventional splicing of wheat tabzip60 and obtained evidence that spliced tabzip60 contributes to heat tolerance by regulating a set of er stressrelated genes, including atbzip60. Original article fungal endophytes enhance wheat heat. Heat stress, a regular risk to wheat in the subtropics, is a growing threat in other wheat producing regions as the global temperature rises. Improving heat tolerance in wheat is major goal for wheat breeder and morphophysiological traits in plants are affected by heat stress n achit et al. Cms alone cannot be used as the exclusive selection. Pdf breeding for heat tolerance in wheat sindhu sareen. Traits associated with high temperature tolerance can be used to develop heat tolerant cultivars. Mapping qtl for the traits associated with heat tolerance.
Heat tolerance index hti pg heat pg controlpg average 2 is an important trait to consider, as it takes into account both the percent germination under heat stress and under control conditions while comparing each accession to the population average, thus giving a ranking among all accessions evaluated. Heat shock transcription factors hsfs and plant hormones play regulatory roles in plant responses to heat stress baniwal et al. Cell membrane thermal stability, antioxidant activity, phenolics content, paraquat tolerance and kernel weight were compared for their ability to identify heat tolerant genotypes. Phenotyping, genetic dissection, and breeding for drought. Attempts have been made to induce heat tolerance in a range of plant species using different approaches. Multiple loci for heat tolerance have been identified in wheat paliwal et al. Moench were adapted to and evaluated in field grown wheat triticum aestivum l. In this study, we found that taopr3 contributes to heat tolerance in wheat probably via regulating ja level. The yield was assessed by quantifying average seed weight asw and total seed weight tsw in endophyteinoculated and endophytefree wheat exposed to heat or. Heat stress responses in a large set of winter wheat. Heat tolerance indicators in pakistani wheat triticum. Assessing genetic variation for heat stress tolerance in.
Therefore, heat tolerance in wheat is likely to become a key trait for increased yield potential and yield stability in southern europe in the future. Qtl mapping studies for heat tolerance have been conducted on various rice populations at flowering stages. Keywords wheat, triticum aestivum, heat tolerance, terminal heat stress, climate change, yield. Characterization of heat tolerance in wheat cultivars and effects on. Aegilops tauschii, the diploid wild ancestral species and the d genome donor of bread wheat, is a promising genetic resource for breeding feldman 2001, helbaek 1959, kihara 1944, mujeebkazi et al. Drought and heat tolerance tests that were developed for sorghum sorghum bicolor l. Heat stress due to increased temperature is a very important problem globally. Improved wheat for heat tolerance and climate resilience agrilinks. Recent data shows that thylakoid membrane stability is highly associated with the heat tolerance capacity of wheat. Wheat growth can be impaired by heat stress hs at any developmental stage, and modeling scenarios predict even warmer temperatures in the future easterling. Heat shock protein 101 hsp101, the homolog of caseinolytic protease b clpb proteins, has functional conservation across species to play roles in heat acclimation and plant development.
A screen for wheat triticum aestivum genes that confer cd tolerance to a cd hypersensitive yeast strain identified heat shock transcription factor a4a hsfa4a. Pdf heat stress during grain filling is a major constraint to wheat triticum aestivum l. Mass screening using staygreen character may be done for heat tolerance of wheat genotypes. Heat tolerance for yield and its components in different. In this study, the suitability of using the membrane thermostability mt test for ascertaining heat tolerance of winter wheat was determined. Wheat triticum aestivum represents about 30% of the worlds cereal area, with over 220 million ha cultivated worldwide, often under abiotic stress. Pdf analysis of heat stress tolerance in winter wheat. Heat shock proteins in association with heat tolerance in. Variation for heat tolerance during seed germination in. Bunited states department of agriculture agricultural research service, plant science and entomology. Traits for better understanding of abiotic stress tolerance in wheat. Diversity and genetic studies of heat tolerance in wheat.
It implies that genetic basis of heat tolerance in synthetic wheat lines was different, therefore enabling wheat breeders to combine these diverse sources of genetic variability to improve heat tolerance in their breeding program. In this chapter, the evects of high temperature on cotton plant as a whole, including important physiological, growth and. Many selection criteria based on morphophysiological traits were reported to be associated with performance under heat stress in wheat. Evaluation of a new method for quantification of heat tolerance in. To determine the range of genetic variability for heat tolerance in 56 spring wheat lines. Heat avoidance is the ability of plants to maintain internal temperatures below lethal stress levels, including transpirational cooling, changes in leaf orientation, reflection of solar radiation, leaf shading of tissues that are sensitive to sunburn, and. Heat tolerance and expression of protein synthesis. This study identified potential heattolerant wild tetraploid wheat germplasm and qtl conditioning heat tolerance that can be incorporated into wheat breeding programs to improve cultivated common and durum wheat. Screening wheat parents of mapping population for heat and drought tolerance detection of wheat genetic variation. Experiments were conducted under optimal conditions, reproductive stage drought stress, heat stress and combined drought and heat stress. Genetic variability, heritability and correlation study of physiological and yield traits in relation to heat tolerance in wheat triticum aestivum l. Heat stress is a rigorous threat, particularly during reproductive and grainfilling phases, that results into yield loss.
On the other hand, grain yield under heat stress can be improved by selecting genotypes for the rate of grain lling and for grain size. Please view the pdf by using the full text pdf link under view to the left. Physiological traits for improving heat tolerance in wheat. Heat tolerance is a complex phenomenon thus difficult to assess. Grass may survive heat stress through heatavoidance or heattolerance mechanisms. Cell membrane stability as a measure of drought and heat. A field experiment was conducted with six wheat varieties halna, hd 2733, nw 1014, k 9006, raj 44 and pbw 343 for detection of genetic variability for heat tolerance traits in. Heat tolerance is a complex phenomenon and difficult to measure. Identification of drought, heat, and combined drought and. Crop science abstract membrane thermostability and heat tolerance of spring wheat view my binders. Twenty one diverse, standard and experimental cultivars of common spring wheat triticum aestivum l.
Heat tolerance and expression of protein synthesis elongation factors, eftu and ef1a, in spring wheat urskabukovnika,c,jianmingfua,mirandabennetta,p. Capturing traits providing heat stress tolerance in wheat using. Present genotypes are found to be ideal candidates to be used in developing heat tolerant wheat varieties. Develop heat tolerant varieties using marker assisted background selection and forward breeding approaches. Genomewide association mapping of seedling heat tolerance. International journal of biological and life sciences 7 5666. Issr, genetic variability, synthetic wheats, phenotypic traits, heat tolerance. Characterization of heat tolerance in wheat cultivars and effects on production components193 rev. This paper reports on three experiments evaluating 49 entries of the th high temperature wheat yield trial htwyt from the international centre for maize and wheat improvement distributed in 2014, with fang 60 as. Breeding for heat tolerance in bread wheat triticum aestivum l. In this study we evaluated 300 maize inbred lines testcrossed to cml539.
Since the beginning of the century, ambient temperatures have increased and are predicted to rise further under climate change. Crop science abstract membrane thermostability and heat. Combined stress frequently affects wheat plants during heading or in the. Physiological mechanisms of heat tolerance are relatively well understood, further studies. Germplasm evaluation of heat tolerance in bread wheat in tel. Assessing genetic variation for heat stress tolerance in indian bread wheat genotypes using morphophysiological traits and molecular markers volume 15 issue 6 p. Traits and parameters to measure drought and heat tolerance and their genetic dissection in wheat.
The drought tolerance test is based on the measurement of the electroconductivity of aqueous media containing leaf discs that were previously water stressed. Drought and heat stress tolerance screening in wheat using. Pdf breeding for heat tolerance in wheat nabin bhusal. Orthologs of the class a4 heat shock transcription factor. Unconventional splicing of wheat tabzip60 confers heat.
Heat stress during the seedling stage of earlyplanted winter wheat triticum aestivum l. Computed tomography offers the opportunity for much faster and more accurate assessment of yield. Evaluation of screening techniques for heat tolerance in wheat. The ultimate effect is on plant growth as well as development and reduced yield and quality. Many selection criteria based on morphophysiological traits were cite this article. Improving abiotic stress tolerance in wheat requires large scale screening of yield components such as seed weight, seed number and single seed weight, all of which is very laborious, and a detailed analysis of seed morphology is timeconsuming and visually often impossible. Research article open access mapping qtl for the traits. We further place this knowledge in the context of breeding for new, more tolerant varieties and discuss opportunities and constraints.
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