TAILIEUCHUNG - Water Stress Part 2

Tham khảo tài liệu 'water stress part 2', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Water Stress in Plants Causes Effects and Responses 7 counter action to resulted damages and their quick repair such as scavenging of ROS and decrease oxidative stress and the regulation and recovery of growth. The complex plant response to water stress alike other abiotic stresses involves many genes and biochemical and molecular mechanisms. Sequentially they are signal sensing perception and transduction by osmosensors like AtHK1 kinases and phospholipases as well as secondary messengers transcriptional control by transcription factors such as DREB dehydration-responsive transcription factors and activation of stress responsive mechanisms such as detoxification of ROS by enzymes such as SOD and CAT osmoprotection by compatible solutes and free radicals scavengers such as glutathione and proline and water and ion homeostasis by aquaporins and ion transporters. The results of these responsive pathways are the re-establishment of cellular homeostasis and functional and structural protection and finally stress resistance or tolerance. Stomata closure is the well-known first responsive event of plants to water deficiency. Stomatal closures are more closely related to soil moisture content than leaf water status and it is mainly controlled by chemical signals such as ABA produced in dehydrating roots. A direct correlation between the xylem ABA content and stomatal conductance has been demonstrated. Changes in plant hydraulic conductance plant nutritional status xylem sap pH farnesyl tranferase activity leaf-to-air vapor pressure deficit and decrease in relative water content are other factors working in stomatal regulation plants. Although CO2 assimilation and net photosynthesis decreases due to stomatal closure but attainment of low transpiration rate and prevention of water losses from leaves is a good tradeoff for survival in exchange of growth. Stomata can completely close in mild to severe stress depending on plant species and tolerant species control stomata .

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