positive tolerance
4.A positive mental attitude is the right mental attitude in any given situation and is most often composed of the plus characteristics symbolized by such words as"faith," "integrity," "hope," "optimism," "courage" "initiative," "generosity," "tolerance," "tact," "kindliness," and "good common sense."
5.Under 300 mmol L -1 NaCl stress, the content of Na + increased, the contents of K +, chlorophyll(chl) and K +/Na + ratio decreased in the leaves of two barley varieties differing in salt tolerance. The positive correlation between glutathion(GSH) content and K +/Na + ratio as chlorophyll content was significant.

