Relationship Between Flag Leaf Senescence and Grain Yield in Durum Wheat Grown under Drought Conditions

Hafsi, M.; Hadji, A.; Guendouz, Ali; Maamari, K.

doi:10.3923/ja.2013.69.77

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…The SPAD values from 0 to 22 d after anthesis did not correlate with TKW, which is in agreement with a study on durum wheat (Hafsi et al, 2013). However, there was a negative association between SPAD readings in flag leaves and TKW at 32 d after anthesis (data not shown), both at Guanghan and Jiangyou.…”

Section: Discussionsupporting

confidence: 92%

Physiological Factors Underpinning Grain Yield Improvements of Synthetic‐Derived Wheat in Southwestern China

Tang

Rosewarne²,

et al. 2015

Crop Science

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Synthetic hexaploid wheat (SHW) is a valuable source of genetic diversity for germplasm enrichment in wheat breeding. In China, SHW‐derived material has shown significant yield increases. A 3‐yr field experiment at Guanghan and Jiangyou in the Sichuan Basin of China was conducted to characterize the potential of three SHW‐derived cultivars (SDCs) with five local elite nonsynthetic‐derived cultivars as checks (NSCs). On average, SDCs showed an 11.5% or 951 kg ha−1 yield increase compared with NSCs. This yield gain was mainly attributed to increases in both grain number m−2 (5.7%) and thousand kernel weight (5.9%). A higher rate of aboveground dry matter accumulation, especially in the early growth stages, was observed in the SDCs. The SDCs also had better partitioning to the grain, as evidenced through an increased harvest index (HI). The SDCs had a relatively compact and erect plant type with medium and upper leaves having a mean extinction coefficient at 45° (EC45°) increase of 8.4% above the NSCs at 20‐d after flowering. Correlations between grain yield components and physiological traits were analyzed. We concluded that the use of SHW has the potential to significantly increase wheat yield grown under rain‐fed environments with low photosynthetically active radiation.

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Section: Discussionsupporting

confidence: 92%

Physiological Factors Underpinning Grain Yield Improvements of Synthetic‐Derived Wheat in Southwestern China

Tang

Rosewarne²,

et al. 2015

Crop Science

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“…During the senescence phase, protein complexes in chloroplasts including PSII, break down which leads to changes in the structure, metabolism and gene expression of photosynthetic cells, ultimately resulting in loss of cellular chlorophyll content (Thomas and Howarth, 2000;Podzimska-Sroka et al, 2015). Therefore, to maintain translocation of assimilates from leaves and stems to the grain and maintain grain yield, genotypes with delayed leaf senescence are preferred (Hafsi et al, 2013). Delayed senescence and persistence of greenness were introduced above as the stay-green trait and are associated with altered cytokinin and ethylene activities (Thomas and Ougham, 2014).…”

Section: Flag Leaf Senescencementioning

confidence: 99%

A Physio-Morphological Trait-Based Approach for Breeding Drought Tolerant Wheat

et al. 2020

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In the past, there have been drought events in different parts of the world, which have negatively influenced the productivity and production of various crops including wheat (Triticum aestivum L.), one of the world's three important cereal crops. Breeding new high yielding drought-tolerant wheat varieties is a research priority specifically in regions where climate change is predicted to result in more drought conditions. Commonly in breeding for drought tolerance, grain yield is the basis for selection, but it is a complex, late-stage trait, affected by many factors aside from drought. A strategy that evaluates genotypes for physiological responses to drought at earlier growth stages may be more targeted to drought and time efficient. Such an approach may be enabled by recent advances in high-throughput phenotyping platforms (HTPPs). In addition, the success of new genomic and molecular approaches rely on the quality of phenotypic data which is utilized to dissect the genetics of complex traits such as drought tolerance. Therefore, the first objective of this review is to describe the growth-stage based physio-morphological traits that could be targeted by breeders to develop droughttolerant wheat genotypes. The second objective is to describe recent advances in high throughput phenotyping of drought tolerance related physio-morphological traits primarily under field conditions. We discuss how these strategies can be integrated into a comprehensive breeding program to mitigate the impacts of climate change. The review concludes that there is a need for comprehensive high throughput phenotyping of physio-morphological traits that is growth stage-based to improve the efficiency of breeding drought-tolerant wheat.

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“…On the other hand, correlation analysis showed that the CTD was significantly and negatively correlated with RS, and CTD 15DPA could explain 4.7% of the total variation in RS. The ranking of genotypes varied at all the measurement dates according to the LSR, suggesting that measurement only on one date is not sufficient for determining genotypic variations for senescence (Hafsi et al, 2013 Li et al (2012), and Lopes and Reynolds (2012).…”

Section: Genotypic Variations In the Physiological Traits And Their Relationship With Grain Yield And Drought Sensitivitymentioning

confidence: 99%

Physiological characterization of Turkish bread wheat genotypes for resistance to late drought stress

Öztürk¹,

Aydın²

2017

Turk J Agric For

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A number of physiological traits have been proposed as selection criteria for late drought resistance and grain yield improvement in wheat. To characterize them in terms of late drought resistance, 64 bread wheat genotypes were evaluated for canopy temperature difference (CTD), leaf senescence rate (LSR), SPAD chlorophyll value, initial fluorescence (Fo), maximum fluorescence (Fm), variable fluorescence (Fv), maximum quantum efficiency of PSII (Fv/Fm), leaf ash content, and grain ash content in two field experiments conducted in irrigated and late drought conditions during the 2011-12 and 2012-13 seasons in Erzurum, Turkey. The experiments were conducted in an 8 × 8 lattice design with two replicates. Significant variation was observed among the genotypes for all the traits. Late drought decreased the grain yield, CTD, SPAD, Fm, Fv, Fv/Fm, and leaf ash content but increased LSR and grain ash content. The drought sensitivity of the genotypes was determined by a ranking method based on 25 traits measured in the late drought conditions. According to the rank-sum (RS) values of the genotypes, four genotypes were defined as resistant, 15 genotypes as medium resistant, 34 genotypes as medium sensitive, and 11 genotypes as sensitive. Resistant genotypes Müfitbey and Dağdaş 94 produced the highest grain yields in late drought conditions and appeared to be promising parents for the breeding of resistant cultivars. RS was negatively correlated with CTD, SPAD, Fm, Fv, and Fv/Fm, while it was positively correlated with LSR. For screening late droughtresistant genotypes, 15 days post anthesis (15DPA) is the optimum time for Fv, CTD, and SPAD measurements. The stepwise multiple linear regression analysis indicated that the Fv 15DPA , Fv 25DPA , CTD 15DPA , and SPAD 15DPA could explain 75.2% of the total variation in RS. Therefore, the Fv 15DPA , Fv 25DPA , CTD 15DPA , and SPAD 15DPA traits can be used as selection criteria as a combination for the classifying of wheat genotypes in terms of late drought resistance.

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Relationship Between Flag Leaf Senescence and Grain Yield in Durum Wheat Grown under Drought Conditions

Cited by 12 publications

References 7 publications

Physiological Factors Underpinning Grain Yield Improvements of Synthetic‐Derived Wheat in Southwestern China

Physiological Factors Underpinning Grain Yield Improvements of Synthetic‐Derived Wheat in Southwestern China

A Physio-Morphological Trait-Based Approach for Breeding Drought Tolerant Wheat

Physiological characterization of Turkish bread wheat genotypes for resistance to late drought stress

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