Early selection of bread wheat genotypes using morphological and photosynthetic attributes conferring drought tolerance

Ahmed, Hafiz Ghulam Muhu-Din; Khan, Abdus Salam; Li, Mingju; Khan, Sultan Habibullah; Kashif, Muhammad

doi:10.1016/s2095-3119(18)62083-0

Cited by 31 publications

(19 citation statements)

References 17 publications

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“…Leaf RWC is the most common physiological method used in drought screening to assess the sensitivity of the plant tissue and cell dehydration tolerance [37,100,101]. Several researchers also documented that drought-resistant genotypes retain more water in their leaf as compared to the sensitive genotypes [30,58,61,86]. Our results revealed that drought stress significantly declined RWC by 21.6% which is consistent with Pour et al [37] findings who reported that drought stress decreased RWC in wheat.…”

Section: Discussionsupporting

confidence: 90%

“…Deprivation of water in the soil causes a root system plasticity [84] which further reduces root proliferation and ultimately inhibits the upstream water and mineral transportation and largely reduces grain yield [56]. More recently, Ahmed et al [58] reported that wheat plants with a deeper root growth and suppressed shoot system are an indicator of drought tolerance, as they have increased root to shoot ratios. In the present study, though drought stress had a significant effect (p < 0.001) on the shoot and root length and their fresh and dry biomasses, some of the wheat genotypes exhibited better root and shoot length under stress conditions (Supplementary Table S2), which might suggest that a smaller root to shoot ratio increased the transpiration rate as the water is not adequately transported via the root and the higher shoot may in turn, facilitate the transpiration rate [88,89] and eventually lead to wilting and senescence.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies showed that drought stress imposition at the early growth stage significantly affects the grain yield by deteriorating the photosynthetic reserves [55] and delaying phenology through smaller roots [56]. Drought tolerance is a stage-specific trait [57] and therefore breeding for drought tolerance using morpho-physiological, and biochemical parameters at any growth stage [30,46,[58][59][60][61][62][63][64] have paramount importance.…”

Section: Introductionmentioning

confidence: 99%

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Physio-Morphological and Biochemical Trait-Based Evaluation of Ethiopian and Chinese Wheat Germplasm for Drought Tolerance at the Seedling Stage

Belay

Zhengbin

2021

Sustainability

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For Ethiopia’s wheat production, drought is a major natural disaster. Exploration of drought-resistant varieties from a bulk of wheat germplasm conserved in the gene bank is of paramount importance for breeding climate change-resilient modern cultivars. The present study was aimed at identifying the best performing drought-resistant genotypes under non-stress and polyethylene glycol simulated (PEG) stress conditions in a growth chamber. Forty diverse Ethiopian bread and durum wheat cultivars along with three Chinese bread wheat cultivars possessing strong drought resistance and susceptibility were evaluated. After acclimation with the natural environment, the seedlings were imposed to severe drought stress (20% PEG6000), and 15 seedling traits including photosynthetic and free proline were investigated. Our findings indicated that drought stress caused a profound decline in plant water consumption (83.0%), shoot fresh weight (64.9%), stomatal conductance (61.6%), root dry weight (55.2%), and other investigated traits except root to shoot length ratio and proline content which showed a significant increase under drought stress. A significant and positive correlation was found between photosynthetic pigments in both growth conditions. Proline exhibited a negative correlation with most of the investigated traits except root to shoot length ratio and all photosynthetic pigments which showed a positive and non-significant association. Our result also showed a wide range of genetic variation (CV) ranging from 3.23% to 47.3%; the highest in shoot dry weight (SDW) (47.3%) followed by proline content (44.63%) and root dry weight (36.03%). Based on multivariate principal component biplot analysis and average sum of ranks (ASR), G12, G16 and G25 were identified as the best drought tolerant and G6, G42, G4, G11, and G9 as bottom five sensitive. The potential of these genotypes offers further investigation at a molecular and cellular level to identify the novel gene associated with the stress response.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physio-Morphological and Biochemical Trait-Based Evaluation of Ethiopian and Chinese Wheat Germplasm for Drought Tolerance at the Seedling Stage

Belay

Zhengbin

2021

Sustainability

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“…The observed reduction in chlorophyll pigment was also previously reported and is associated with the combined effect of chlorophyll loss and water stress, especially in drought-sensitive wheat varieties. In contrast, better preservation of chlorophyll was found in drought-tolerant plants, emphasizing their capacity to have optimal photosynthesis despite water stress conditions [ 23 , 78 , 79 ].…”

Section: Discussionmentioning

confidence: 99%

“…Thus, several strategies, such as germplasm assessment and hybridization with wild species to obtain drought-tolerant varieties, are continuously applied to achieve this goal [ 19 ]. Ahigh degree of novel genetic variation is often achieved in crops through induced mutagenesis, either by chemicals (e.g., ethyl methanesulfonate, EMS and sodium azide) or other means (e.g., gamma radiation) [ 20 , 21 ], in order to improve physiological traits and increase yield, which has been reported for many crops species including wheat, barley, rice, beans, tomatoes, lentils and mango [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. According to the IAEA database ( , accessed on 19 March 2021), two mutant wheat varieties ( Deada and Leana ) derived from chemical mutagenesis were successfully integrated in 2017 for direct use in commercial farming under conditions of Ukrainian Steppe farms.…”

Section: Introductionmentioning

confidence: 99%

EMS Derived Wheat Mutant BIG8-1 (Triticum aestivum L.)—A New Drought Tolerant Mutant Wheat Line

Roux

Burger

Vlok

et al. 2021

IJMS

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Drought response in wheat is considered a highly complex process, since it is a multigenic trait; nevertheless, breeding programs are continuously searching for new wheat varieties with characteristics for drought tolerance. In a previous study, we demonstrated the effectiveness of a mutant known as RYNO3936 that could survive 14 days without water. In this study, we reveal another mutant known as BIG8-1 that can endure severe water deficit stress (21 days without water) with superior drought response characteristics. Phenotypically, the mutant plants had broader leaves, including a densely packed fibrous root architecture that was not visible in the WT parent plants. During mild (day 7) drought stress, the mutant could maintain its relative water content, chlorophyll content, maximum quantum yield of PSII (Fv/Fm) and stomatal conductance, with no phenotypic symptoms such as wilting or senescence despite a decrease in soil moisture content. It was only during moderate (day 14) and severe (day 21) water deficit stress that a decline in those variables was evident. Furthermore, the mutant plants also displayed a unique preservation of metabolic activity, which was confirmed by assessing the accumulation of free amino acids and increase of antioxidative enzymes (peroxidases and glutathione S-transferase). Proteome reshuffling was also observed, allowing slow degradation of essential proteins such as RuBisCO during water deficit stress. The LC-MS/MS data revealed a high abundance of proteins involved in energy and photosynthesis under well-watered conditions, particularly Serpin-Z2A and Z2B, SGT1 and Calnexin-like protein. However, after 21 days of water stress, the mutants expressed ABC transporter permeases and xylanase inhibitor protein, which are involved in the transport of amino acids and protecting cells, respectively. This study characterizes a new mutant BIG8-1 with drought-tolerant characteristics suited for breeding programs.

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Study of Breeding Lines of Soft Spring Wheat in a Competitive Variety Trial in Irkutsk Region

Klimenko

Abramova

Кузнецова

2021

Fundamental and Applied Scientific Research in the Development of Agriculture in the Far East (AFE-2021)

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Early selection of bread wheat genotypes using morphological and photosynthetic attributes conferring drought tolerance

Cited by 31 publications

References 17 publications

Physio-Morphological and Biochemical Trait-Based Evaluation of Ethiopian and Chinese Wheat Germplasm for Drought Tolerance at the Seedling Stage

Physio-Morphological and Biochemical Trait-Based Evaluation of Ethiopian and Chinese Wheat Germplasm for Drought Tolerance at the Seedling Stage

EMS Derived Wheat Mutant BIG8-1 (Triticum aestivum L.)—A New Drought Tolerant Mutant Wheat Line

Study of Breeding Lines of Soft Spring Wheat in a Competitive Variety Trial in Irkutsk Region

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