英语翻译C3 species was sensitive to high temperature and C4 spec

英语翻译
C3 species was sensitive to high temperature and C4 species was sensitive to low temperature.By comparison of germination results in all the alternating temperature regimes,we found that high or low temperature,not amplitude acted an important role in the effects of global warming on seed germination.Field experiment showed that more plants germinated in spring,not autumn in Songnen grassland.Germination experiment exhibited that significant differences in germination between diurnal increased and decreased temperature in the spring and autum low ranges 5-10 and 10-15oC,with the former higher.Germination in spring is an adaptive strategy by natural selection.The relationship between germination rate and salinity under different temperatures of C.virgata and D.sanguinalis was curvilinear.We thought there may be some physiological mechanisms,which reduced osmotic stress in the middle and high salinities.This led to the obviously increasing of the germination rate.Further experiments showed that compared with PEG treatment,seeds can germinate in lower water potential induced by NaCl and germinate faster.Seed dry weight decreased with the time.Water content,seed sodium concentration and seed solution sodium concentration of NaCl treatments were significantly higher than the isotonic PEG treatments.Seed sodium concentration and seed solution sodium concentration of germinating and un-germinating seeds in NaCl treatments increased as the water potential decreased.Water content,seed sodium concentration and seed solution sodium concentration increased linearly with time.According to the results,we proposed salinity model:θS = (Sm– S) t,in whichθS is salinity constant,Sm is the maximum salinity above which seed can't germinate,S is the external salinity,and t is germination time.The germination response of seed to salt was divided into four stages.The first stage mainly involved negative osmotic effect.In the second stage,ionic effect and osmotic effect existed together,with ionic effect stonger.In the third stage,no seed germinated in PEG treatment and ionic positive effect was largely higher than osmotic effect.In the fourth stage,ionic effect gradually began to harm the seed.
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C3 species was sensitive to high temperature and C4 species was sensitive to low temperature. By comparison of germination results in all the alternating temperature regimes, we found that high or low...