Temporally and Genetically Discrete Periods of Wheat Sensitivity to High Temperature

Barber, Henry; Lukáč, Martin; Simmonds, James; Semenov, Mikhail A.; Gooding, M. J.

doi:10.3389/fpls.2017.00051

Cited by 33 publications

(31 citation statements)

References 45 publications

(87 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, ?50% reduction in seed weight among synthetic wheat was recorded when exposed to heat stress (35°C for 10 d) after anthesis (Yang et al, 2002). In our study, heat stress during flowering for 10 d recorded negative impact on both seed number (spike −1 ) and seed weight (spike −1 ), whereas the impact of heat stress during grain filling was more severe on seed weight, which supports earlier observations in wheat (Saini and Aspinall, 1982;Liu et al, 2016;Barber et al, 2017). The reduction in seed weight (spike −1 ) with stress during flowering was a mere reflection of the significant decline in seed number than weight per seed.…”

Section: Discussionsupporting

confidence: 89%

Quantifying the Impact of Heat Stress on Pollen Germination, Seed Set, and Grain Filling in Spring Wheat

et al. 2019

View full text Add to dashboard Cite

Exposure to temperatures ≥30°C during flowering and grain filling stages can negatively affect seed set and seed weight in spring wheat (Triticum aestivum L.). The screening of a large set of germplasm under hot wheat growing environments (Indo‐Gangetic Plain in India) led to the identification of promising heat‐tolerant genotypes. The selected set of 28 diverse spring wheat genotypes were exposed to heat stress (34/16°C day/night temperatures) for 10 d during flowering and for 30 d during grain filling to quantify genetic variability in pollen germination, photosynthesis, and yield parameters under controlled‐environment conditions. Pollen grains collected immediately at anthesis (between 0530 and 0630 h) were incubated on liquid in vitro pollen germination media. Averaged across wheat genotypes, a significant reduction in pollen germination (39.9%, P < 0.001) was recorded from plants exposed to heat stress. Heat stress for 10 d during flowering induced significant reduction in seed number (15.4 and 23.0%) and seed weight (32.3 and 34.6%) on main and primary spikes, respectively, compared with the control. Heat stress during grain filling had a more pronounced impact on seed weight (16 and 22%) than seed number (2.7 and 9.3%) in main and primary spikes, respectively. Genotypes KSG025 and KSG1214 with higher seed number, seed weight, and harvest index and appreciable pollen germination under heat stress were identified as candidate donors for simultaneously enhancing flowering and post‐flowering heat tolerance in spring wheat.

show abstract

Section: Discussionsupporting

confidence: 89%

Quantifying the Impact of Heat Stress on Pollen Germination, Seed Set, and Grain Filling in Spring Wheat

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The fact that eastern landraces had larger numbers of spikes per unit area than those from the west Mediterranean countries, may be interpreted as an evolutionary adaptive mechanism to compensate for the negative effect of water scarcity on the formation of spikes. Similarly, the larger number of grains per unit area, whose potential is determined before booting (Isidro et al, 2011 ), may be a means to compensate for the degeneration of florets occurring from booting to flowering (Isidro et al, 2011 ) and the subsequent reduction in grain setting caused by heat and drought stress (Barber et al, 2017 ). The high frequency of alleles conferring a high number of spikes and grains in landraces collected in the four eastern countries (93% in both cases) may be biologically interpreted as a mechanism for achieving higher grain yield.…”

Section: Discussionmentioning

confidence: 99%

Durum Wheat Landraces from East and West Regions of the Mediterranean Basin Are Genetically Distinct for Yield Components and Phenology

et al. 2018

View full text Add to dashboard Cite

Genetic diversity of durum wheat landraces is a powerful tool for the introgression of new alleles of commercial interest in breeding programs. In a previous study, our team structured a collection of 172 durum wheat landraces from 21 Mediterranean countries in four genetic populations related to their geographical origin: east Mediterranean (17), east Balkan and Turkey (23), west Balkan and Egypt (25), and West Mediterranean (73), leaving 34 genotypes as admixed, and association mapping was carried out for important agronomic traits. Using a subset of this collection, the current study identified 23 marker alleles with a differential frequency in landraces from east and west regions of the Mediterranean Basin, which affected important agronomic traits. Eastern landraces had higher frequencies than the western ones of alleles increasing the number of spikes (wPt-5385 on chromosome 1B), grains per m2 (wPt-0841 on chromosome 7B), and grain filling duration (7 significant marker trait associations). Eastern landraces had higher frequencies of marker alleles located on chromosomes 4A, 5B, and 6B associated with reduced cycle length, and lighter grains than the western ones. Also for lower kernel weight, four marker alleles were located on chromosome 1A. Breeders may use the molecular markers identified in the current study for improving yield under specific Mediterranean environments.

show abstract

“…We found that temperature differentially affects grain formation along the spike with the middle of the spike being more sensitive to the stresses. Recent studies have shown that there are two discrete developmental stages where the spike is more sensitive to temperature: early booting when meiosis is occurring and anthesis [ 8 – 10 ]. Floret development along the spike is asynchronous [ 12 ] it is thus tempting to speculate that the florets in the middle were at a temperature-sensitive stage when the stress was applied.…”

Section: Discussionmentioning

confidence: 99%

“…Drought also has a significant impact on wheat yield particularly when applied during the reproductive phase [ 11 ]. The effect on yield has mainly been attributed to reduced grain number although, for some varieties and at specific growth stages, grain size could increase to compensate for this [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Non-destructive, high-content analysis of wheat grain traits using X-ray micro computed tomography

et al. 2017

View full text Add to dashboard Cite

BackgroundWheat is one of the most widely grown crop in temperate climates for food and animal feed. In order to meet the demands of the predicted population increase in an ever-changing climate, wheat production needs to dramatically increase. Spike and grain traits are critical determinants of final yield and grain uniformity a commercially desired trait, but their analysis is laborious and often requires destructive harvest. One of the current challenges is to develop an accurate, non-destructive method for spike and grain trait analysis capable of handling large populations.ResultsIn this study we describe the development of a robust method for the accurate extraction and measurement of spike and grain morphometric parameters from images acquired by X-ray micro-computed tomography (μCT). The image analysis pipeline developed automatically identifies plant material of interest in μCT images, performs image analysis, and extracts morphometric data. As a proof of principle, this integrated methodology was used to analyse the spikes from a population of wheat plants subjected to high temperatures under two different water regimes. Temperature has a negative effect on spike height and grain number with the middle of the spike being the most affected region. The data also confirmed that increased grain volume was correlated with the decrease in grain number under mild stress.ConclusionsBeing able to quickly measure plant phenotypes in a non-destructive manner is crucial to advance our understanding of gene function and the effects of the environment. We report on the development of an image analysis pipeline capable of accurately and reliably extracting spike and grain traits from crops without the loss of positional information. This methodology was applied to the analysis of wheat spikes can be readily applied to other economically important crop species.Electronic supplementary materialThe online version of this article (doi:10.1186/s13007-017-0229-8) contains supplementary material, which is available to authorized users.

show abstract

Temporally and Genetically Discrete Periods of Wheat Sensitivity to High Temperature

Cited by 33 publications

References 45 publications

Quantifying the Impact of Heat Stress on Pollen Germination, Seed Set, and Grain Filling in Spring Wheat

Quantifying the Impact of Heat Stress on Pollen Germination, Seed Set, and Grain Filling in Spring Wheat

Durum Wheat Landraces from East and West Regions of the Mediterranean Basin Are Genetically Distinct for Yield Components and Phenology

Non-destructive, high-content analysis of wheat grain traits using X-ray micro computed tomography

Contact Info

Product

Resources

About