Heat shock transcription factors hsfs and plant hormones play regulatory roles in plant responses to heat stress baniwal et al. High temperature stress during the grainfill period is a major constraint to increased productivity of spring wheat, particularly in the southern part of the region. High temperature 30 c at the time of grain filling is one of the major constraints in increasing productivity of wheat in tropical countries like india. Heat stress is a rigorous threat, particularly during reproductive and grainfilling phases, that results into yield loss. Since very limited att empts were made to identify and map candidate genes for heat tolerance, there is an urgent need to develop. Quality of winter wheat in relation to heat and drought shock after anthesis. Heat tolerance for yield and its components in different. Ventnor, a heat tolerant white winter wheat with karl 92, a relatively heat susceptible hard red winter wheat. Heat stress during grain filling is a major constraint to wheat triticum aestivum l.
Heat tolerance, heat stress susceptibility index, spring wheat nificant yield reduction. Heat tolerance thus should be essential characteristic of wheat cultivars to be developed. Higher msi was also observed in as2002, as well as inqalab91. Hence, wheat genotypes from national and international sources are regularly evaluated for tolerance to high temperature stress. Heat tolerance is quantitative in nature, controlled by a number of genesqtl quantitative trait loci. The screening of varieties has identified significant variation for heat stress tolerance. Developing heat tolerant cultivars has become a principal breeding goal in the southern and central great plain areas of the usa. Pdf physiological traits for improving heat tolerance in. Due to the complexity of heat stress tolerance, the accuracy of the information generated in the initial stage of this project is not suitable as a variety selection tool. Crop science abstract heat tolerance in winter wheat. All those suggested the important role of different type e3 ligases in the regulation of plant heat tolerance.
Sep 27, 2017 approximate physical localization of these three qtls revealed the presence of 12 potential candidate genes having a direct role in photosynthesis andor heat tolerance. Pdf cell membrane stability as a measure of drought and. Heat tolerance and expression of protein synthesis elongation. Pdf breeding for heat tolerance in wheat nabin bhusal. Wheat triticum aestivum represents about 30% of the worlds cereal area, with over 220 million ha cultivated worldwide, often under abiotic stress. The present study was conducted to identify promising terminal heat tolerant wheat lines through adoption of the staggered date of planting strategy.
Morphophysiological traits associated with heat stress. Detection of qtls for heat tolerance in wheat measured by. When the final article is assigned to volumesissues of the publication, the article in press version will be removed and the final version will appear in the associated published volumesissues of the publication. Tam107, was used for gene cloning and expression analyses. This study provides insights into genes that may be involved in regulating heat tolerance in a tolerant genotype and those that are responsive to heat in the developing wheat grain of tolerant and susceptible genotypes. Traits and parameters to measure drought and heat tolerance and their genetic dissection in wheat. Heat tolerance evaluation of wheat triticum aestivum l. Heat tolerance indicators in pakistani wheat triticum. These results suggest that the mt test would be a suitable procedure for selecting heat tolerant winter wheat genotype in a breeding program. Vinayan1, shahid umar2, pooja devi1, muhammad iqbal2, k. Twenty one diverse, standard and experimental cultivars of common spring wheat triticum aestivum l.
Pdf wheat improvement for drought and heat tolerance. Genomewide analysis of the hsp101clpb gene family for. Increasing heat tolerance in wheat to counteract recent and projected increases in heat stress. Previous studies conducted in the past have proven that wheat growth and yield were negatively influenced by abnormal temperatures due to physiological disruption. Besides providing an insight into the genetic control of fvfm in the present study, the identified qtls would be useful in breeding for heat tolerance in wheat.
Wheat growth can be impaired by heat stress hs1 at any developmental stage, and modeling scenarios predict even warmer temperatures in the. Qtl mapping and the major loci influencing heat tolerance in wheat. Several studies have been conducted to assess wheat yield under high temperature conditions using controlled environments. Understanding the genetic basis of tolerance to high temperature is important for improving the productivity of wheat triticum aestivum l. Heat tolerance was estimated for each variable by the heat susceptibility. Keywords wheat, triticum aestivum, heat tolerance, terminal. Basics of cold tolerance and winter survival in winter wheat.
Hti was used to quantify the magnitude of heat stress to which 12 advanced wheat. Pdf breeding for heat tolerance in wheat researchgate. In the present study the use of recurrent selection was evaluated as a strategy to improve heat stress tolerance in wheat. 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. High temperature indexfor field evaluation of heat tolerance. Basics of cold tolerance and winter survival in winter wheat david struthers, winter cereals canada inc. Feb, 2016 the development of new varieties is expensive and timeconsuming, and knowledge of heat tolerance mechanisms would aid the design of strategies to screen germplasm for heat tolerance traits. Stay green is a trait that has been used to indicate heat tolerance in hot environment acevedo et al. Abstractthe development of heat tolerant varieties is an important goal of wheat breeding programs, requiring efficient selection methods. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Correspondingly, wheat has developed a series of molecular mechanisms to cope with climate variations and to protect themselves from injury and damage. Cell membrane thermostability cms is considered to be one of the major selection indices of drought tolerance in cereals.
Please view the pdf by using the full text pdf link under view to the left. Breeding for heat tolerance in wheat biotech articles. Genomewide analysis of the hsp101clpb gene family for heat tolerance in hexaploid wheat. In this study, the suitability of using the membrane thermostability mt test for ascertaining heat tolerance of winter wheat was determined.
We further place this knowledge in the context of breeding for new, more tolerant varieties and discuss opportunities and constraints. The purpose of this paper was to study the genetic variability, heritability, heat tolerance indices and phenotypic and genotypic correlation studies for traits of 250 elite international center for agricultural research in the dry areas icarda bread wheat genotypes under high temperature in wad medani, center in sudan. Dmc1 is a candidate for temperature tolerance during wheat. In this study, we found that taopr3 contributes to heat tolerance in wheat probably via regulating ja level. Heat stress responses in a large set of winter wheat. Because assessment of heat tolerance is an important component in breeding programmes aimed at improving the ecological adaptation of cereals, research on heat stress tolerance has begun in the agricultural institute mta atk mgi, in martonvasar 4951. G12, g, g14, g18, and g19 were identified as heat tolerant genotypes based on their relative performance in yield components, grain yield and heat susceptibility indices. Genomewide analysis of the hsp101clpb gene family for heat. Heat stress in wheat during reproductive and grainfilling. Plant materials and growth conditions heat and drought tolerant wheat, cv. Vikas gupta, chandra nath mishra and satish kumar indian institute of wheat and barley research, karnal2001 haryana wheat is the second most important winter cereal after rice. Over the past three decades efforts have been made to elucidate the genetic basis of heat tolerance. The genotype fang60 was demonstrated to be a potential source of heat stress tolerance for use in wheat breeding.
Evaluation of drought and heat tolerance in wheat based on. Therefore, in this context, selection for cell membrane thermostability was performed under heat stress in two f 2 bread wheat populations. Winter wheat has evolved adaptive mechanisms that are. Breeding for tolerance to heat and other clima pdf. This test was used to identify critical genes controlling heat tolerant in common wheat, and to release new cultivars of bread wheat and durum wheat capable of withstanding severe heat. Unravelling the metabolic and phytohormonal changes in anthers exposed to heat stress would help identify mechanisms regulating heat stress tolerance during the sensitive reproductive stage. Pdf high temperature ht stress is a major environmental stress that limits plant growth, metabolism, and productivity worldwide. Terminal heat stress during grain filling stage causes severe yield reduction in wheat.
Morphophysiological traits associated with heat stress tolerance in tropical maize zea mays l. This study was performed to evaluate the relationship between stem reserves as a constitutive trait and of thermotolerance to sustained wheat grain filling under heat stress. Screening for heat tolerance in spring wheat triticum. This variety performed well with superior grain yields under nonirrigated conditions in colorado. Wheat heat shock factor tahsfa6f increases aba levels and. Terminal heat stress is a common abiotic factor for reducing the yield in certain areas of west asia and north africa ferrera et al.
Zaidi1 1asian regional maize program, international maize and wheat improvement centre cimmyt, icrisat campus. Breeding wheat for heat tolerance requires a sufficient information about the genetic diversity in the gene pool of wheat and appropriate laboratory methods to screen wheat germplasms for heat tolerance. It will be interesting to study the potential regulatory network of tahsfa6f in aba metabolism andor aba signaling pathways. Pdf physiological, biochemical, and molecular mechanisms. Pdf genetic improvement of heat tolerance in wheat. Research paper heat tolerance around flowering in wheat. 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. Significant variation was evidenced for all the investigated seedling traits. Quantitative and molecular characterization of heat. Evaluating genetic diversity for heat tolerance in mexican wheat landraces article pdf available in genetic resources and crop evolution 461. High temperature heat stress during grain filling is a major problem in most of the wheat growing areas. Selection for heat tolerance in bread wheat triticum.
Tabzip60 splicing occurs in wheat under heat stress condition. Pdf evaluating genetic diversity for heat tolerance in. Mar 29, 2016 measurement of heat tolerance parameters different physiological mechanisms may contribute to heat tolerance in the field for example, heat tolerant metabolism as indicated by higher photosynthetic rates, staygreen, and membrane thermostability, or heat avoidance as indicated by canopy temperature depression. With global climate change, heat stress is becoming an increasingly severe constraint on wheat production. Different levels of heritability and genetic advance were found among the tested traits, indicating whether the trait is. Despite much earlier flowering at these sites, the risk of heat stress affecting yields of heat sensitive ideotypes remained high. Traits associated with high temperature tolerance can be used to develop heat tolerant cultivars in wheat. Pdf genomewide analysis of the hsp101clpb gene family. Genetic variations, heritability, heat tolerance indices and. Burke 2001 reported that seedling heat tolerance is essential in most dryland cotton production areas because producers plant cotton when moisture becomes available. A novel screening method was developed to assess the existing genetic variation for early stage heat tolerance and to identify heat tolerant genotypes. Author links open overlay panel jagadish rane a shantha. Mapping qtl for the traits associated with heat tolerance in. Phenotyping, genetic dissection, and breeding for drought and.
However, there are cases of successes in conventional breeding for improved heat and drought tolerance traits. Since the beginning of the century, ambient temperatures have increased and are predicted to rise further under climate change. Heat stress in wheat during reproductive and grainfilling phases. The objective of this study was to estimate inheritance of heat tolerance and the minimum number of genes for the trait in bread wheat by combining quantitative genetic estimates and molecular marker analyses. Over expression of tabzip60s in arabidopsis enhances heat stress tolerance we identified the downstream targets of tabzip60s using chipqpcr strategy, which contribute to great biological importance to heat tolerance. Similarly in north india, the soil temperature and wind velocity at sowing time are very high, resulting in rapid loss of soil moisture lather et al. Transcriptome profiling of wheat genotypes under heat. Screening wheat germplasm for heat tolerance at terminal. Work done in heat stress breeding wheat variety golden halna k0424 is a terminal heat tolerant variety developed by wheat breeder dr. High temperature indexfor field evaluation of heat tolerance in wheat varieties.
Drought and heat stress tolerance screening in wheat using. Diversity and genetic studies of heat tolerance in wheat. Frontiers wheat fbox protein gene tafba1 is involved in. High temperature indexfor field evaluation of heat. Varaprasada andzoranristicb,d adepartment of agronomy, kansas state university, manhattan, ks 66506, usa. Pdf breeding for heat tolerance in wheat sindhu sareen. Nov 29, 2019 heat stress significantly limits yield in many wheat. Physiological traits for improving heat tolerance in wheat. Development of mapping populations and their characterization for drought tolerance in wheat.
Srap showed its efficiency in discriminating wheat genotypes by gathering all highdsilines in one subcluster and generating 10 and 3 unique and specific bands for highdsilines and lowdsilines, respectively. These bands could be used for further work as srap markers associated with drought tolerance in wheat. In addition to the grain yield plant breeders should also include sod, pod, psr and msi as markers in the breeding program for development of heat tolerant wheat cultivars. Recent progress in understanding the underlying molecular mechanisms. Heat tolerance and expression of protein synthesis elongation factors, eftu and ef1a, in spring wheat urskabukovnika,c,jianmingfua,mirandabennetta,p. Computed tomography offers the opportunity for much faster and more accurate assessment of yield components. Significant variation was seen among cultivars in the reduction in grain weight per ear rgw, kernel number, and single kernel. Enhanced heat tolerance of viralinfected aphids leads to. Qtls and potential candidate genes for heat stress tolerance.
Heat shock transcription factor a1b regulates heat. Increasing heat tolerance in wheat to counteract recent and. Unconventional splicing of wheat tabzip60 confers heat. Breeding for plant heat tolerance at vegetative and. The anthesis growth stage was found to be more sensitive to heat stress than seed development at the milky stage.
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