Does the time of day influence the plant transcriptome in response to stress?5 answersThe time of day significantly influences the plant transcriptome in response to stress. Studies on Brachypodium distachyon and hybrid poplars show that gene expression patterns vary throughout the day under stress conditions. The circadian clock plays a crucial role in modulating gene expression in response to stress, with specific genes showing peak expression at different times of the day. The circadian core oscillators are involved in orchestrating defense mechanisms through rhythmic gene expression, protein modifications, and subcellular processes to cope with various stresses. These findings highlight the importance of considering the time of day when studying plant responses to stress, as it influences the transcriptome dynamics and ultimately the plant's ability to adapt and survive in challenging environmental conditions.
What is the impact of heat stress on tomatoes production?4 answersHeat stress has a severe impact on tomato production. It affects various aspects of tomato plants, including flower development, pollen production, fruit set, and yield. Exposure to high temperatures can lead to irregular flower development, reduced pollen viability, and ovule abortion, resulting in poor fruiting and reduced yield. Heat stress also causes damage to the reproductive system, particularly in male meiosis, leading to impaired synapsis and chiasmata formation, resulting in aneuploid spores and clonal seed production. Additionally, heat stress triggers a heat stress response (HSR) in tomato plants, involving the activation of heat shock proteins and other transcription factors, as well as alternative splicing of pre-mRNA. The HSR is crucial for maintaining cellular homeostasis and thermotolerance. Tomato plants exhibit different responses to heat stress depending on the severity and duration of exposure, with more drastic phenotypic changes observed during heat wave-like treatments. Understanding the molecular mechanisms underlying heat tolerance and identifying superior genotypes with increased tolerance to extreme temperatures are important for developing heat-tolerant tomato cultivars.
How climate change affect tomatoes production?5 answersClimate change has significant effects on tomato production. Rising temperatures, reduced water availability, and changes in precipitation patterns negatively impact tomato yields and quality. Heat waves associated with global warming can lead to yield losses and remarkable yield losses occur every year due to the sensitivity of many tomato cultivars to heat stress. Drought and water stress can also affect tomato production, but certain cultivars show tolerance to water stress and can maintain fruit quality under water-stressed conditions. Additionally, climate change can lead to the emergence of pests and diseases, which further impact tomato production. To mitigate the adverse effects of climate change on tomato production, adaptation strategies such as selecting climate-resilient cultivars and adjusting planting times need to be implemented. Overall, climate change poses significant challenges to tomato production, but understanding the responses of tomato plants to climate stress can help in developing resilient varieties.
How heat stress application method in tomato experiment?5 answersHeat stress application methods in tomato experiments varied across the studies. In one study, tomato plants were sprayed with gibberellic acid (GA3) at concentrations of 25, 50, 75, and 100 mg L−1. Another study applied elementary sulfur through spraying at concentrations of 2, 4, 6, and 8 ppm. A third study subjected tomato plants to controlled high temperature treatments in a water bath, increasing the temperature systematically from 35 to 60°C. The fourth study evaluated the tolerance to heat stress by comparing the pollen growth and tube development in heat-treated and non-heat-stressed conditions. Lastly, a study exposed tomato plants to heat stress of 44°C for four hours in a growth chamber and assessed physiological parameters such as stomatal conductance, electrolyte leakage, and chlorophyll fluorescence. These studies employed different methods to apply heat stress and evaluate the response of tomato plants.
What is heat stress temperature application method in tomato experiment?2 answersHeat stress temperature application methods in tomato experiments varied across the studies. In one study, tomato plants were grown in growth chambers at temperatures of 25 and 45 °C. Another study subjected tomato plants to night temperatures above 21 °C to evaluate heat tolerance. In another experiment, tomato plants were grown in growth chambers at temperatures of 25 and 45 °C. Additionally, a study exposed tomato plants to temperatures of 23 °C (optimal temperature) and 40 °C (heat stress). Lastly, mature green tomatoes were treated with hot air or hot water at temperatures ranging from 35 to 45 °C.
How long and which temperature heat stress application method in tomato experiment?5 answersHeat stress application methods and durations varied across the tomato experiments. In one study, tomato plants were subjected to heat stress at 40 °C for 20 hours in darkness. Another experiment applied heat stress at temperatures ranging from 35 to 60 °C with gradual increments every 30 minutes. Additionally, two growth chambers were used in different experiments, with temperatures set at 25 and 45 °C. The duration of heat stress and specific temperature ranges were not mentioned in the abstracts.