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| 1 | Characteristics of plant calcium fractions for 25 species in Tengger Desert显示文摘Little attention has been paid to plant calcium fractions in the desert.To address the characteristic of the calcium fractions of desert plants,we collected 25 plant species in Tengger Desert,observed the calcium crystals using an optical microscope and determined water soluble calcium,acetic acid soluble calcium,and hydrochloric acid soluble calcium.To do so,we used sequential fractionation procedures to probe the relationships among different functional groups,different growth forms,or different successional stages.The results showed that the psammophyte,the late successional plants,and the drought-resistant shrub and semi-shrub all held considerable calcium oxalate crystal compared to the grassland plants,the early successional plants,and the perennial herb.With the proceeding succession,the acetic acid soluble calcium decreased gradually,and the hydrochloric acid soluble calcium increased gradually.The perennial herb had more water soluble calcium,while shrub held greater hydrochloric acid soluble calcium.The grassland plants held more water soluble calcium,while psammophyte had greater hydrochloric acid soluble calcium.This implies that the plants that are relatively sensitive to drought hold more calcium ion,while the drought-resistance plants hold more calcium oxalate.Thus,the plant calcium components are in close relation to plant drought-resistance,and of important significance in plant physiology of the desert. | HuaCong Ci XingDong lie Rong Li Wei Wu PingPing Xue YuBao Gao HaLin Zhao | 2010 | Research in Cold and Arid Regions2010，2，2： | 3 |
| 2 | Effect of salt stress on the expression of NHX-type Na^+/H^+ antiporters in Populus euphratica and P.pruinosa calli显示文摘Populus euphratica and Populus pruinosa,sister species in the Turanga Section(Salicaceae),growing in semi-arid saline areas are known for their high salinity tolerance.In this study,by combining growth level with Na+and K+contents,the expression level of vacuolar Na+/H+antiporters was investigated for NaCl-induced changes in P.euphratica and P.pruinosa calli.Compared to P.euphratica,P.pruinosa calli grew well in 200 mM NaCl stress from 14 to 21 days.Increasing the stressed time caused an increase in Na+content concomitant with a decrease in K+content in P.euphratica calli,whereas,with the presence of 200 mM NaCl,K+content has a less increase in 14 and 21 days than in 7 days which was detected in P.pruinosa calli.The transcript levels of six genes coding for NHX-type Na+/H+antiporters suggest that vacuolar NHX1–NHX6 antiporters play important roles in responding to salt stress in P.pruinosa.Our data suggest that there exists a higher salt tolerance for P.pruinosa than P.euphratica at the cellular level,Na+avoidance or accumulation is observed in cellular compartments,and that expression of NHX antiporters is linked to the accumulator phenotype. | LiHua Hu YuXia Wu | 2014 | Research in Cold and Arid Regions2014，6，1： | 0 |
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