Agronomical and physiological perspectives for identification of wheat genotypes for high temperature tolerance

Khan, Muhammad Athar; Shirazi, Muhammad Ubaidullah; Shereen, Aisha; Ali, Muhammad; Asma, Asma; Jilani, Nabila Shah; Mahboob, Wajid

doi:10.30848/pjb2020-6(12)

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…Global warming is a significant cause of HTS, which poses a serious threat to wheat production in many countries, especially during the reproductive and grain filling phases (Farooq et al, 2011;Khan et al, 2020). Wheat yield reduction under HTS is correlated with fewer spikes and smaller grains (Gibson and Paulsen, 1999;Lesk et al, 2016), whereas grain weight is significantly reduced by high temperatures in the middle and late stages of grain filling (Tahir and Nakata, 2005;Wajid et al, 2018).…”

Section: Yieldmentioning

confidence: 99%

“…The temperature threshold for grain filling in winter wheat is 25 • C (Porter and Gawith, 1999;Wahid et al, 2007). When day/night temperatures increase to 30 • C/25 • C, the filling duration is shortened and dry matter accumulation decreases (Huebner and Bietz, 1988;Khan et al, 2020). However, the temperature often rises above 30 • C in late spring, during the middle or late grain filling late stage, around the middle to lower reaches of the Yangtze River (World Weather Information Service).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnesium Application Promotes Rubisco Activation and Contributes to High-Temperature Stress Alleviation in Wheat During the Grain Filling

Shao

Gao

et al. 2021

Front. Plant Sci.

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Inhibited photosynthesis caused by post-anthesis high-temperature stress (HTS) leads to decreased wheat grain yield. Magnesium (Mg) plays critical roles in photosynthesis; however, its function under HTS during wheat grain filling remains poorly understood. Therefore, in this study, we investigated the effects of Mg on the impact of HTS on photosynthesis during wheat grain filling by conducting pot experiments in controlled-climate chambers. Plants were subjected to a day/night temperature cycle of 32°C/22°C for 5 days during post-anthesis; the control temperature was set at 26°C/16°C. Mg was applied at the booting stage, with untreated plants used as a control. HTS reduced the yield and net photosynthetic rate (Pn) of wheat plants. The maximum carboxylation rate (VCmax), which is limited by Rubisco activity, decreased earlier than the light-saturated potential electron transport rate. This decrease in VCmax was caused by decreased Rubisco activation state under HTS. Mg application reduced yield loss by stabilizing Pn. Rubisco activation was enhanced by increasing Rubisco activase activity following Mg application, thereby stabilizing Pn. We conclude that Mg maintains Rubisco activation, thereby helping to stabilize Pn under HTS.

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Section: Yieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnesium Application Promotes Rubisco Activation and Contributes to High-Temperature Stress Alleviation in Wheat During the Grain Filling

Shao

Gao

et al. 2021

Front. Plant Sci.

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“…On the other hand, DUNCLED×P1-801 was considered the highest (11.1%) mean performer, while the lowest (8.5%) mean value was shown by 2702×DUNCLED. The earlier finding of Brassica napus quality traits both significant and non-significant differences was studied by Khan et al (2010) et al, 2013) reported the significant results for the above protein content trait. For oleic acid content the highest non-significant GCA results were exposed by 2702 (1.21%) tracked by P1-801 (0.95%), however significantly negative GCA were bared by DUNCLED (-1.87%), similar results were studied in Brassica napus L. by (Shehzad et al, 2015).…”

Section: Analytical Pr Otocolmentioning

confidence: 83%

Elucidating Genetic Variability of Brassica napus L. Progenitors and Their Crosses for Enhanced Qualitative Traits

Ali Shah,

Ahmad,

Ullah

et al. 2023

JSPAE

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Evaluation of the breeding population is crucial for the selection of a superior genotype. Hence, the present study was conducted to assess genetic variation among five Brassica napus L. parents and their diallel hybrids to identify the best-performing parents and crosses. Heterosis and inbreeding depression were also assessed for the qualitative traits. Among the parental genotypes, Ancestor 2702 was identified as the best general combiner for protein (1.41%) and oleic acid content (1.21%). 2702×DUNCLED was the best specific combiner for oil content (0.78%), while 2702×2722 was recognized as best cross for linoleic acid content (1.3%). Similarly, DUNCLED×2702 was the best reciprocal cross for oil content (2.4%) and linoleic acid content (0.4 %), while P1-801×2702 was considered the best cross for protein content (2.2%) and oleic acid (1.7%). All the qualitative traits revealed a broad sense of heritability and non-additive type of gene action, which indicated the later generation selection for further improvement. High oleic acid content, preferred negative mid and best parent heterosis for erucic acid, glucosinolate and moisture contents was reported for 2702×DUNCLED. The favorable cross combination for protein and oil content was 2702×2722, which also yielded the positive mid and best parent heterosis. Inbreeding depression for qualitative traits ranged from -20.8% to 22.9%. It was concluded that among all the genotypes, accession 2702 was the best general, specific and reciprocal combiner, and the best parent heterosis for all traits when crossed with genotypes DUNCLED, P1-119 and 2722. It is also suggested that the screened crosses be carried to further generations to improve the quality related traits of Brassica napus. L.

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“…Total water-soluble sugars (TSS) and enzymatic antioxidants (SOD, POD, and CAT) were increased by 54, 85, 90, and 78%, respectively, in the current study over the water-treated plants of 8 days of heat stress (across the genotypes and in the second year of study). This increase in TSS and enzymatic antioxidants under high-temperature stress in wheat could be associated with carbohydrates synthesis, their accumulation and the stimulation of the defensive system ( Fahad et al, 2017 ; Khan et al, 2020 ). The total soluble sugars and antioxidants have been found to increase under heat stress in wheat by exogenous application of potassium ( Hong-Bo et al, 2006 ).…”

Section: Discussionmentioning

confidence: 99%

Strengthening leaf physiological functioning and grain yield formation in heat-stressed wheat through potassium application

et al. 2022

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Wheat crops are highly sensitive to high temperatures during their reproductive and grain-filling phases. We hypothesized that potassium could increase thermotolerance in wheat during grain filling by protecting cellular organelles, particularly chlorophyll, from heat injury. Two wheat genotypes, Ujala-16 (relatively heat tolerant) and Anaj-17 (relatively susceptible) were grown in pots and were submitted to 4 and 8 days of heat stress under polythene sheets 1 week after anthesis. One day before the onset of heat stress, 2% potassium (K) as K2SO4 was sprayed on all the plants. Flag leaves from both genotypes were collected after 4 and 8 days of heat stress. Leaf physiology changes were measured to quantify heat damage and to understand the K-induced recovery mechanism. The crop was harvested 125 days after sowing, and grain yield data were collected. Increasing duration of heat stress significantly impaired leaf physiology and grain yield of both studied wheat genotypes. Compared with control (under optimum temperature), 4 and 8 days heat-stressed plants produced 11 and 19% lesser grain yield per spike (averaged across genotypes and in the second years of study), respectively. Likewise, 4- and 8-days heat-stressed plants had 15 and 37% (averaged across genotypes and in the second years of study) lower flag leaf photosynthesis, respectively, compared with control plants. Across the genotypes, 8-days heat caused significantly more grain yield loss in Anaj-17 during the second year than in Ujala-16. Foliar K significantly restored leaf chlorophyll, Pn, Fv/Fm by reducing cellular membrane damage in the heat-stressed plants. This physiological recovery and activation of the plant defensive system by K under high-temperature stress protected the growth and grain development. For example, K–treated plants produced 19% higher 1,000 grain weight in 8 days of heat stress (across genotypes and in the second years of study) compared with water-treated plants under the hot environment of the respective thermal regime. Our study suggests that wheat performance under terminal heat stress can be improved through the exogenous application of K.

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Agronomical and physiological perspectives for identification of wheat genotypes for high temperature tolerance

Cited by 10 publications

References 26 publications

Magnesium Application Promotes Rubisco Activation and Contributes to High-Temperature Stress Alleviation in Wheat During the Grain Filling

Magnesium Application Promotes Rubisco Activation and Contributes to High-Temperature Stress Alleviation in Wheat During the Grain Filling

Elucidating Genetic Variability of Brassica napus L. Progenitors and Their Crosses for Enhanced Qualitative Traits

Strengthening leaf physiological functioning and grain yield formation in heat-stressed wheat through potassium application

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