scholarly journals The impact of high-temperature stress on rice: challenges and solutions

2021 ◽  
Author(s):  
Yufang Xu ◽  
Chengcai Chu ◽  
Shanguo Yao
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
High Temperature Stress ◽  
The Impact

scholarly journals Alterations of Endogenous Hormones, Antioxidant Metabolism, and Aquaporin Gene Expression in Relation to γ-Aminobutyric Acid-Regulated Thermotolerance in White Clover

Antioxidants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1099
Author(s):  
Hongyin Qi ◽  
Dingfan Kang ◽  
Weihang Zeng ◽  
Muhammad Jawad Hassan ◽  
Yan Peng ◽  
...  
Keyword(s):  
Gene Expression ◽  
High Temperature ◽  
Temperature Stress ◽  
White Clover ◽  
High Temperature Stress ◽  
Aminobutyric Acid ◽  
Endogenous Hormones ◽  
Gaba Level ◽  
Antioxidant Metabolism ◽  
The Impact

Persistent high temperature decreases the yield and quality of crops, including many important herbs. White clover (Trifolium repens) is a perennial herb with high feeding and medicinal value, but is sensitive to temperatures above 30 °C. The present study was conducted to elucidate the impact of changes in endogenous γ-aminobutyric acid (GABA) level by exogenous GABA pretreatment on heat tolerance of white clover, associated with alterations in endogenous hormones, antioxidant metabolism, and aquaporin-related gene expression in root and leaf of white clover plants under high-temperature stress. Our results reveal that improvement in endogenous GABA level in leaf and root by GABA pretreatment could significantly alleviate the damage to white clover during high-temperature stress, as demonstrated by enhancements in cell membrane stability, photosynthetic capacity, and osmotic adjustment ability, as well as lower oxidative damage and chlorophyll loss. The GABA significantly enhanced gene expression and enzyme activities involved in antioxidant defense, including superoxide dismutase, catalase, peroxidase, and key enzymes of the ascorbic acid–glutathione cycle, thus reducing the accumulation of reactive oxygen species and the oxidative injury to membrane lipids and proteins. The GABA also increased endogenous indole-3-acetic acid content in roots and leaves and cytokinin content in leaves, associated with growth maintenance and reduced leaf senescence under heat stress. The GABA significantly upregulated the expression of PIP1-1 and PIP2-7 in leaves and the TIP2-1 expression in leaves and roots under high temperature, and also alleviated the heat-induced inhibition of PIP1-1, PIP2-2, TIP2-2, and NIP1-2 expression in roots, which could help to improve the water transportation and homeostasis from roots to leaves. In addition, the GABA-induced aquaporins expression and decline in endogenous abscisic acid level could improve the heat dissipation capacity through maintaining higher stomatal opening and transpiration in white clovers under high-temperature stress.

scholarly journals High-Temperature and Drought Stress Effects on Growth, Yield and Nutritional Quality with Transpiration Response to Vapor Pressure Deficit in Lentil

Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 95
Author(s):  
Noureddine El Haddad ◽  
Hasnae Choukri ◽  
Michel Edmond Ghanem ◽  
Abdelaziz Smouni ◽  
Rachid Mentag ◽  
...  
Keyword(s):  
High Temperature ◽  
Drought Stress ◽  
Vapor Pressure ◽  
Grain Yield ◽  
Protein Content ◽  
Temperature Stress ◽  
Nutritional Quality ◽  
Vapor Pressure Deficit ◽  
High Temperature Stress ◽  
The Impact

High temperature and water deficit are among the major limitations reducing lentil (Lens culinaris Medik.) yield in many growing regions. In addition, increasing atmospheric vapor pressure deficit (VPD) due to global warming causes a severe challenge by influencing the water balance of the plants, thus also affecting growth and yield. In the present study, we evaluated 20 lentil genotypes under field conditions and controlled environments with the following objectives: (i) to investigate the impact of temperature stress and combined temperature-drought stress on traits related to phenology, grain yield, nutritional quality, and canopy temperature under field conditions, and (ii) to examine the genotypic variability for limited transpiration (TRlim) trait in response to increased VPD under controlled conditions. The field experiment results revealed that high-temperature stress significantly affected all parameters compared to normal conditions. The protein content ranged from 23.4 to 31.9%, while the range of grain zinc and iron content varied from 33.1 to 64.4 and 62.3 to 99.3 mg kg−1, respectively, under normal conditions. The grain protein content, zinc and iron decreased significantly by 15, 14 and 15% under high-temperature stress, respectively. However, the impact was more severe under combined temperature-drought stress with a reduction of 53% in protein content, 18% in zinc and 20% in iron. Grain yield declined significantly by 43% in temperature stress and by 49% in the combined temperature-drought stress. The results from the controlled conditions showed a wide variation in TR among studied lentil genotypes. Nine genotypes displayed TRlim at 2.76 to 3.51 kPa, with the genotypes ILL 7833 and ILL 7835 exhibiting the lowest breakpoint. Genotypes with low breakpoints had the ability to conserve water, allowing it to be used at later stages for increased yield. Our results identified promising genotypes including ILL 7835, ILL 7814 and ILL 4605 (Bakria) that could be of great interest in breeding for high yields, protein and micronutrient contents under high-temperature and drought stress. In addition, it was found that the TRlim trait has the potential to select for increased lentil yields under field water-deficit environments.

scholarly journals Impact of High Temperature Stress on Morpho Physiological Traits and Yield of Rice (Oryza sativa L.) Genotypes

2021 ◽  
Vol 108 ◽  
pp. 1-4
Author(s):  
Maheswari P ◽  
◽  
Chandrasekhar C N ◽  
Jeyakumar P ◽  
Saraswathi R ◽  
...  
Keyword(s):  
High Temperature ◽  
Grain Yield ◽  
Leaf Area ◽  
Plant Height ◽  
Temperature Stress ◽  
Oryza Sativa L ◽  
High Temperature Stress ◽  
Physiological Traits ◽  
Rice Genotypes ◽  
The Impact

High temperature stress is a major environmental factor that affects crop growth, development and yield, it especially limits rice yield. Hence, an experiment was conducted to study the impact of high temperature on morpho-physiological parameters and yield of rice genotypes. Ten rice genotypes were used in this study viz., N22, ADT 36, ADT 37, ADT 43, ADT 45, CO 51, ASD 16, MDU 6, TPS 5 and Anna (R) 4. The study was carried out at OTC (Open Top Chamber) with the treatments of ambient, ambient +2O C and ambient +4O C. Stress was imposed from anthesis to early grain filling period. Observations on plant height, the number of tillers, leaf area, SPAD (Chlorophyll index) and chlorophyll stability index (CSI) were done after the stress imposement and grain yield was calculated after harvest. Results revealed that, the significant changes were observed in morpho-physiological traits and grain yield of rice genotypes among the treatments and with the genotypes. N22 (10% and 19%) and Anna (R) 4 (12% and 22%) recorded less reduction of grain yield in ambient +2O C and ambient +4O C compared with ambient, due to less reduction of total chlorophyll content, SPAD values, leaf area and increased plant height. These parameters resulted in higher biomass which indirectly contributed to higher grain yield in N22 and Anna (R) 4 under high temperature

scholarly journals Screening of Indian Mustard (Brassica juncea L. Czern and Coss) Genotypes with Respect to Seedling Growth Physiology under Salinity and High-Temperature Stress

2021 ◽  
pp. 97-108
Author(s):  
Satya Narayan Prasad ◽  
. Kavita ◽  
. Kiran ◽  
Trisha Sinha
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
Seedling Growth ◽  
Growth Parameters ◽  
Indian Mustard ◽  
High Temperature Stress ◽  
Seedling Stage ◽  
Growth Physiology ◽  
Vigour Index ◽  
The Impact

The experiment was carried out to screen mustard genotypes under individual and combined salinity and high-temperature stress at seedling stage. Seeds after being sown in soil-filled trays were subjected to two levels of salinity stress i.e. 4.0 dSm-1 and 6.0 dSm-1, and high-temperature (40℃), and their performances were also compared with control (1.2 dSm-1). Contrasting sets of genotypes were selected on the basis of seedling growth parameters such as germination percentage, seedling length, dry weight of seedlings, vigour index-I and vigour index-II, recorded in 15-day-old seedlings. With consideration to the genotypic variations observed under all the treatments, genotypes CS2009-347 and CS-52 were identified as tolerant, and genotypes CS2009-256 and CS2009-145 were identified as susceptible under salinity and high-temperature stress conditions. The results also revealed that the impact of salinity and high-temperature in combination on mustard at seedling stage was more detrimental than that of their effects under individual conditions. These findings of genotypic variations in terms of tolerance in seedling stage of Indian mustard might be helpful in selection of genotypes with improved tolerance to salinity and high-temperature.

Impact of high-temperature stress on rice plant and its traits related to tolerance

2011 ◽  
Vol 149 (5) ◽  
pp. 545-556 ◽  
Author(s):  
F. SHAH ◽  
J. HUANG ◽  
K. CUI ◽  
L. NIE ◽  
T. SHAH ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
Pollen Viability ◽  
High Temperature Stress ◽  
Temperature Tolerance ◽  
Yield Reduction ◽  
Growth Duration ◽  
Spikelet Sterility ◽  
Sowing Time ◽  
The Impact

SUMMARYThe predicted 2–4°C increment in temperature by the end of the 21st Century poses a threat to rice production. The impact of high temperatures at night is more devastating than day-time or mean daily temperatures. Booting and flowering are the stages most sensitive to high temperature, which may sometimes lead to complete sterility. Humidity also plays a vital role in increasing the spikelet sterility at increased temperature. Significant variation exists among rice germplasms in response to temperature stress. Flowering at cooler times of day, more pollen viability, larger anthers, longer basal dehiscence and presence of long basal pores are some of the phenotypic markers for high-temperature tolerance. Protection of structural proteins, enzymes and membranes and expression of heat shock proteins (HSPs) are some of the biochemical processes that can impart thermo-tolerance. All these traits should be actively exploited in future breeding programmes for developing heat-resistant cultivars. Replacement of heat-sensitive cultivars with heat-tolerant ones, adjustment of sowing time, choice of varieties with a growth duration allowing avoidance of peak stress periods, and exogenous application of plant hormones are some of the adaptive measures that will help in the mitigation of forecast yield reduction due to global warming.

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

2021 ◽  
Vol 12 ◽  
Author(s):  
Yuhang Shao ◽  
Shiyu Li ◽  
Lijun Gao ◽  
Chuanjiao Sun ◽  
Jinling Hu ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
Grain Filling ◽  
Rubisco Activase ◽  
High Temperature Stress ◽  
Temperature Cycle ◽  
Wheat Grain ◽  
Rubisco Activity ◽  
The Impact ◽  
Rubisco Activation

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.

scholarly journals Simulation of the impact of high temperature stress on annual crop yields

2005 ◽  
Vol 135 (1-4) ◽  
pp. 180-189 ◽  
Author(s):  
A.J. Challinor ◽  
T.R. Wheeler ◽  
P.Q. Craufurd ◽  
J.M. Slingo
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
Crop Yields ◽  
High Temperature Stress ◽  
Annual Crop ◽  
The Impact

scholarly journals Comparative Phosphoproteomic Analysis Reveals the Response of Starch Metabolism to High-Temperature Stress in Rice Endosperm

2021 ◽  
Vol 22 (19) ◽  
pp. 10546
Author(s):  
Yuehan Pang ◽  
Yaqi Hu ◽  
Jinsong Bao
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
Grain Quality ◽  
Starch Synthesis ◽  
High Temperature Stress ◽  
High Temperature Treatment ◽  
Rice Grain ◽  
Starch Metabolism ◽  
Rice Endosperm ◽  
The Impact

High-temperature stress severely affects rice grain quality. While extensive research has been conducted at the physiological, transcriptional, and protein levels, it is still unknown how protein phosphorylation regulates seed development in high-temperature environments. Here, we explore the impact of high-temperature stress on the phosphoproteome of developing grains from two indica rice varieties, 9311 and Guangluai4 (GLA4), with different starch qualities. A total of 9994 phosphosites from 3216 phosphoproteins were identified in all endosperm samples. We identified several consensus phosphorylation motifs ([sP], [LxRxxs], [Rxxs], [tP]) induced by high-temperature treatment and revealed a core set of protein kinases, splicing factors, and regulatory factors in response to high-temperature stress, especially those involved in starch metabolism. A detailed phosphorylation scenario in the regulation of starch biosynthesis (AGPase, GBSSI, SSIIa, SSIIIa, BEI, BEIIb, ISA1, PUL, PHO1, PTST) in rice endosperm was proposed. Furthermore, the dynamic changes in phosphorylated enzymes related to starch synthesis (SSIIIa-Ser94, BEI-Ser562, BEI-Ser620, BEI-Ser821, BEIIb-Ser685, BEIIb-Ser715) were confirmed by Western blot analysis, which revealed that phosphorylation might play specific roles in amylopectin biosynthesis in response to high-temperature stress. The link between phosphorylation-mediated regulation and starch metabolism will provide new insights into the mechanism underlying grain quality development in response to high-temperature stress.

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