%0 Dataset
%T Study on stress resistance of Populus euphratica No. 2 (2018-2019)
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/8299c763-2e9f-4bb8-a163-e4751ca1a8bb
%W NCDC
%R 10.12072/ncdc.ZDYF.db1673.2022
%A Liang Hairong
%A LIjiatao
%A None
%K Leaf water content;photosynthesis;photosynthetic rate
%X On the basis of the regional afforestation experiment on the excellent tree species Populus euphratica No. 2, the drought tolerance research is further carried out. Mainly through the pot experiment, the mechanism of Populus euphratica No. 2 to deal with drought stress under the condition of continuous drought is studied. The sample is 2-year-old Populus euphratica. In early May, the 2-year-old seedlings are transplanted from Dengkou to the plastic basin of Kubuqi Desert sandy soil, and the cutting rod is 40cm to promote new branches, After normal watering and curing, the water control test shall be started at the end of August, and it shall be measured every 3 days until the leaf wilts and cannot be tested. The measurement contents include:Soil water content (soil box sampling, 3 repetitions), leaf water content (5 leaves for each treatment), leaf photosynthetic characteristics (3 repetitions for each treatment) and biochemical characteristics (5g for each index and each treatment, measured after - 80 ° freezing. See the botanical test guidance for the specific determination method). The soil water content decreased from 20.08% to 0.98%, the leaf water content and relative water content decreased, and the leaf saturation deficit increased by 36.25%; With the increase of drought stress, the net photosynthetic rate (a) of Populus euphratica 2 decreased, and the photosynthetic rate increased with photosynthetic effective radiation (PAR) to 700 mmol m⁻²  s⁻¹ Reaching light saturation rate; The content of biochemical indexes malondialdehyde (MDA) and proline (POD) increases, plant organs are damaged under stress, and membrane peroxidation occurs. The content of malondialdehyde can reflect the degree of stress damage to plants. When plants are subjected to stress, the increase of proline content can reduce cell water potential, help cells or tissues hold water and improve the stress resistance of plants. With the increase of stress degree, the content of pod in leaves of