תפריט נגישות
ניגודיות עדינהניגודיות גבוהה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם תפריט נגישותניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםFour selected NaCl-tolerant cell lines of Sour orange (Citrus aurantium) were compared with the nonselected cell line in their growth and internal ion content of Na+, K+, and Cl− when exposed to increasing NaCl concentrations. No difference was found among the various NaCl-tolerant cell lines in Na+ and Cl− uptake, and all these cell lines took up similar or even larger amounts of Na+ and Cl− than the NaCl-sensitive cell line. Exposure of cells of NaCl-sensitive and NaCl-tolerant lines to equal external concentrations of NaCl, resulted in a greater loss of K+ from the NaCl-sensitive cell line. This observation leads to the conclusion that growth and ability to retain high levels of internal K+ are correlated. Exposure of the NaCl-tolerant cell lines to salts other than NaCl resulted in even greater tolerance to Na2SO4, but rather poor tolerance to K+ introduced as either K2SO4 or KCl; the latter has a stronger inhibitory effect. The NaCl-sensitive cell line proved to be more sensitive to replacement of Na+ by K+. Analyses of internal Na+, K+, and Cl− concentrations failed to identify any particular internal ion concentration which could serve as a reliable marker for salt tolerance.
Four selected NaCl-tolerant cell lines of Sour orange (Citrus aurantium) were compared with the nonselected cell line in their growth and internal ion content of Na+, K+, and Cl− when exposed to increasing NaCl concentrations. No difference was found among the various NaCl-tolerant cell lines in Na+ and Cl− uptake, and all these cell lines took up similar or even larger amounts of Na+ and Cl− than the NaCl-sensitive cell line. Exposure of cells of NaCl-sensitive and NaCl-tolerant lines to equal external concentrations of NaCl, resulted in a greater loss of K+ from the NaCl-sensitive cell line. This observation leads to the conclusion that growth and ability to retain high levels of internal K+ are correlated. Exposure of the NaCl-tolerant cell lines to salts other than NaCl resulted in even greater tolerance to Na2SO4, but rather poor tolerance to K+ introduced as either K2SO4 or KCl; the latter has a stronger inhibitory effect. The NaCl-sensitive cell line proved to be more sensitive to replacement of Na+ by K+. Analyses of internal Na+, K+, and Cl− concentrations failed to identify any particular internal ion concentration which could serve as a reliable marker for salt tolerance.
