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Effects of salinity stress on isoprene emission and photosynthetic parameters in Populus deltoides × Populus nigra(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 01
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Effects of salinity stress on isoprene emission and photosynthetic parameters in Populus deltoides × Populus nigra
SHEN Yan1 FANG Shengzuo2 & SUN Zhihong1**
1 Faculty of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin′an, 311300, China 2 Faculty of Forestry and Biotechnology, Nanjing?Forestry?University, Nanjing, 210037, China
gas-exchange isoprene emission rate isoprene synthase reaction constant pool size of dimethylallyl diphosphate biomass relative growth rate

This study aimed to explore the responses of photosynthetic rate, isoprene emission rate, and growth morphology in two varieties of hybrid poplar crosses, Populus deltoides × Populus nigra 895 and P. deltoides × P. nigra 1388, under salinity conditions. The gas exchange indicators, isoprene emission parameters, and biomass growth index were measured during salinity stress imposed by the addition of 0 and 0.18 mol/L NaCl. Salinity stress substantially reduced the net assimilation rate (Pn), stomatal conductance (gs), transmission rate (Tr) of the both varieties; however, the intercellular CO2 concentration (Ci) was not affected. The isoprene emission rate and isoprene synthase (IspS) reaction constant decreased obviously under salinity in both varieties, showing a statistically insignificant influence on the pool size of isoprenoid precursor dimethylallyl diphosphate (DMADP). The relative height growth rate and total dry weight were significantly decreased under salinity in both varieties, and the ratio of the root and stem weight to total dry weight variety 1388 was significantly higher than that of variety 895, while their leaf dry weights showed the opposite trend. In conclusion, the decrease in isoprene emission rate was mainly due to the decrease in isoprene synthase activity under salinity; the salinity stress responses were similar in both varieties. No significant differences were observed in resistance, but the regulatory mechanisms of isoprene emission and net assimilation rates were different, which was probably the reason for the differences in biomass allocation among different organs of the two studied varieties.


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Last Update: 2019-02-25