To Improve the Effectiveness of Anti-secession and Anti-osmosis in Ideological Field of Xinjiang Higher Vocational Colleges under the Guidance of Scientific Outlook on Development

The source structure of students in Xinjiang higher vocational colleges is complicated; most of the students have multi-variant ideologies and weak self-control ability. Under such background, the struggle of anti-cession and anti-osmosis in the ideological field of Xinjiang higher vocational colleges will become more severe. As the domestic and foreign hostile forces conduct more and more osmosis means in the ideological field of Xinjiang higher vocational colleges and the situations become more and more complicated, the splittism of Xinjiang nations gradually escalates. They have not only made some violent and terrorist activities in the society, but also used the religion to split and permeate the students in higher vocational colleges and some teenagers. Higher vocational colleges are the main export to transmit talents to the nation and the society, so we have to pay enough attention to ideological cultivation and education of students.

Na^+ and Water Uptake in Relation to the Radial Reflection Coefficient of Root in Arrowleaf Saltbush Under Salt Stress

The response of halophyte arrowleaf saltbush （Atriplex triangularis Willd） plants to a gradient of salt stress were investigated with hydroponically cultured seedlings. Under salt stress, both the Na^＋ uptake into root xylem and negative pressures in xylem vessels increased with the elevation of salinity （up to 500 mol/m^3） in the root environment. However, the increment in negative pressures in root xylem far from matches the decrease in the osmotic potential of the root bathing solutions, even when the osmotic potential of xylem sap is taken into consideration. The total water potential of xylem sap in arrowleaf saltbush roots was close to the osmotic potential of root bathing solutions when the salt stress was low, but a progressively increased gap between the water potential of xylem sap and the osmotic potential of root bathing solutions was observed when the salinity in the root environment was enhanced. The maximum gap was 1.4 MPa at a salinity level of 500 mol/m^3 without apparent dehydration of the tested plants. This discrepancy could not be explained with the current theories in plant physiology. The radial reflection coefficient of root in arrowleaf saltbush decreased with the enhanced salt stress was and accompanied by an increase in the Na^＋ uptake into xylem sap. However, the relative Na^＋ in xylem exudates based on the corresponding NaCl concentration in the root bathing solutions showed a tendency of decrease. The results showed that the reduction in the radial reflection coefficient of roots in the arrowleaf saltbush did not lead to a mass influx of NaCl into xylem when the radial reflection coefficient of the root was considerably small; and that arrowleaf saltbush could use small xylem pressures to counterbalance the salt stresses, either with the uptake of large amounts of salt, or with the development of xylem pressures dangerously negative. This strategy could be one of the mechanisms behind the high resistance of arrowleaf saltbush plants to salt stress.