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báo cáo khoa học: " The effect of experimental warming on leaf functional traits, leaf structure and leaf biochemistry in Arabidopsis thaliana"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The effect of experimental warming on leaf functional traits, leaf structure and leaf biochemistry in Arabidopsis thaliana | Jin et al. BMC Plant Biology 2011 11 35 http www.biomedcentral.com 1471-2229 11 35 BMC Plant Biology RESEARCH ARTICLE Open Access The effect of experimental warming on leaf functional traits leaf structure and leaf biochemistry in Arabidopsis thaliana 1 4 t 3 4 t 4 4 z - ị A I L . -J 44 4 Biao Jin LI Wang Jing Wang Ke-Zhen Jiang Yang Wang Xiao-Xue Jiang Cheng-Yang INI Yu-Long Wang5 Nian-Jun Teng 2 Abstract Background The leaf is an important plant organ and how it will respond to future global warming is a question that remains unanswered. The effects of experimental warming on leaf photosynthesis and respiration acclimation has been well studied so far but relatively little information exists on the structural and biochemical responses to warming. However such information is very important to better understand the plant responses to global warming. Therefore we grew Arabidopsis thaliana at the three day night temperatures of 23 18 C ambient temperature 25.5 20.5 C elevated by 2.5 C and 28 23 C elevated by 5 C to simulate the middle and the upper projected warming expected within the 21st century for this purpose. Results The 28 23 C treatment significantly reduced the life span total biomass and total weight of seeds compared with the other two temperatures. Among the three temperature regimes the concentrations of starch chlorophyll and proline were the lowest at 28 23 C whereas the total weight of seeds concentrations of chlorophyll and proline stomatal density SD stomatal conductance gs net CO2 assimilation rate A and transpiration rate E were the highest at 25.5 20.5 C. Furthermore the number of chloroplasts per cell and mitochondrial size were highest at 25.5 20.5 C and lowest at 28 23 C. Conclusions The conditions whereby the temperature was increased by 2.5 C were advantageous for Arabidopsis. However a rise of 5 C produced negative effects suggesting that lower levels of warming may benefit plants especially those which belong to the same functional group