Changes in stay-green and nitrogen use efficiency traits in historical set of winter barley cultivars

Mirosavljević, Milan; Momčilović, Vojislava; Mikić, Sanja; Trkulja, Dragana; Brbaklić, Ljiljana; Zorić, Miroslav; Abičić, Ivan

doi:10.1016/j.fcr.2020.107740

Cited by 15 publications

(7 citation statements)

References 38 publications

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“…As previously reported by Mirosavljević et al. (2020), higher crop greenness at mid senescence could be related to the additional increase of photosynthetic activity during the grain filling period, supporting a higher grain yield of crops.…”

Section: Discussionsupporting

confidence: 77%

Effects of high temperature during anthesis and grain filling on physiological characteristics of winter wheat cultivars

Mirosavljević

Mikić

Župunski

et al. 2021

J Agronomy Crop Science

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Due to climate change, multiple heat events are expected to be an additional limiting factor that will adversely affect wheat production. The study aimed to analyze the physiological response to heat stress in four winter wheat cultivars at different physiological stages under greenhouse conditions during 2019. The net photosynthetic rate, stomatal conductance, chlorophyll index, maximum quantum efficiency of photosystem II, fructose, glucose and sucrose content, grain yield per plant, grain weight and number of grains per plant were analyzed in wheat cultivars under short periods of heat stress at anthesis and mid‐grain filling, and combined stress at anthesis and mid‐grain filling. The results of the study indicated that heat stress modified the photosynthesis‐related and grain yield–related traits. Moreover, heat stress caused a decrease of sucrose content, while fructose and glucose content increased. Heat stress had more pronounced effects on the photosynthetic parameters and grain yield during grain filling than during anthesis. A significant variation observed among cultivar responses to the negative impact of heat stress highlighted the fact that cultivars Pobeda and Gladius were more tolerant than Renesansa and Simonida. Different cultivar reactions to heat stress during anthesis and grain filling indicated the need to conduct further studies with wheat cultivars of different origin in order to identify additional sources of tolerance.

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Section: Discussionsupporting

confidence: 77%

Effects of high temperature during anthesis and grain filling on physiological characteristics of winter wheat cultivars

Mirosavljević

Mikić

Župunski

et al. 2021

J Agronomy Crop Science

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“…The current findings suggest that SPADF and LWCF are positively correlated with grain and RUE and are therefore candidate parameters for indirect selection in breeding programs. The stay‐green trait has been identified as a critical stress adaptation mechanism and significantly affects final GY (Christopher et al., 2016; Mirosavljevi et al., 2020). Delaying leaf senescence to extend the time of active photosynthesis and maintain photosynthetic capacity and further increase RUE can also enhance the total photosynthesis capacity across the wheat life cycle (Christopher et al., 2008).…”

Section: Discussionmentioning

confidence: 99%

Wheat traits and the associated loci conferring radiation use efficiency

Tao

Hao

et al. 2022

The Plant Journal

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SUMMARY Wheat (Triticum aestivum L.) radiation use efficiency (RUE) must be raised through crop breeding to further increase the yield potential, as the harvest index is now close to its theoretical limit. Field experiments including 209 wheat cultivars which have been widely cultivated in China since the 1940s were conducted in two growing seasons (2018–2019 and 2019–2020) to evaluate the variations of phenological, physiological, plant architectural, and yield‐related traits and their contributions to RUE and to identify limiting factors for wheat yield potential. The average annual genetic gain in grain yield was 0.60% (or 45.32 kg ha−1 year−1; R2 = 0.44, P < 0.01), mainly attributed to the gain in RUE (r = 0.85, P < 0.01). The net photosynthetic rates were positively and closely correlated with grain RUE and grain yield, suggesting source as a limiting factor to future yield gains. Thirty‐four cultivars were identified, exhibiting not only high RUE, but also traits contributing to high RUE and 11 other critical traits – of known genetic basis – as potential parents for breeding to improve yield and RUE. Our findings reveal wheat traits and the associated loci conferring RUE, which are valuable for facilitating marker‐assisted breeding to improve wheat RUE and yield potential.

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“…The combination of optimal water and N availability was significant in maintaining the green biomass, contributing to photosynthesis and the physiological properties of the genotype. Nitrogen use efficiency (NUE) is influenced by the size of the root system [56], leaf size and rate of photosynthesis [57,58], stay-green traits [59,60] and increased post-anthesis N-uptake [57]. Such promising traits explain the genetic variability and yield variation under drought and low N conditions.…”

Section: Discussionmentioning

confidence: 99%

Response of Bread Wheat Genotypes for Drought and Low Nitrogen Stress Tolerance

2022

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Drought stress and nitrogen (N) deficiency are the major causes of yield losses in bread wheat (Triticum aestivum) production. Breeding wheat cultivars with combined drought and low N stress tolerance is an economical approach for yield gains. The objective of this study was to evaluate the response of diverse bread wheat genotypes under drought and low N stress conditions to select high-performing genotypes for developing breeding populations and production to mitigate against drought and low N stress. Fifty bread wheat genotypes were evaluated under drought-stressed (DS) and non-stressed (NS) conditions and N application rates of 50, 100 and 200 kg N ha−1. The experiments were conducted in a controlled environment and field conditions during the 2019/20 cropping season. Data on grain yield and yield components were collected and subjected to statistical analysis. The four-way interaction involving genotype, water regime, N treatments and testing environment had a significant (p < 0.05) effect on all assessed agronomic traits, suggesting that genotype response depended on the treatment combinations. Drought stress and 50 kg N ha−1 reduced grain yield by 20% compared to NS and 50 kg N ha−1. The grain yield ranged from 120 to 337 g/m2, with a mean of 228 g/m2 under DS. Under DS and 200 kg N ha−1, the genotype designated as SBO 19 had a higher grain yield of 337 g/m2, followed by SBO 22 (335 g/m2), SBO 16 (335 g/m2), SBO 04 (335 g/m2) and SBO 33 (335 g/m2). Grain yields under DS and 50 kg N ha−1, and NS and 50 kg N ha−1 had a positive and significant correlation (r > 0.5; p < 0.01) with most of the evaluated traits. Highly correlated traits directly contribute to total yield gain and should be incorporated during the selection of high-yielding genotypes. The study identified the 10 best lines that are high-yielding with early flowering and maturity under DS or NS conditions and the three N treatments. The selected lines are recommended as breeding parents to develop drought-adapted and N-use efficient genetic resources. The identified genotypes are important for sustainable wheat production and effective breeding of improved cultivars to mitigate drought stress and soil nutrient deficiencies, to ensure food security in Sub-Saharan Africa.

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Changes in stay-green and nitrogen use efficiency traits in historical set of winter barley cultivars

Cited by 15 publications

References 38 publications

Effects of high temperature during anthesis and grain filling on physiological characteristics of winter wheat cultivars

Effects of high temperature during anthesis and grain filling on physiological characteristics of winter wheat cultivars

Wheat traits and the associated loci conferring radiation use efficiency

Response of Bread Wheat Genotypes for Drought and Low Nitrogen Stress Tolerance

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