Ca and B analysisContent of Ca in shoots was analyzed according tothe method described by Thomas et al. (1967). Driedshoots were digested in hydrogen peroxide (H2O2) andsulfuric acid (H2SO4), and a flame atomic absorptionspectrophotometer (UV-1700, Shimadzo, Kyoto, Japan)was used to determine the Ca content. For B analysis,oven-dried shoots were ash-dried (600 °C for 1 h) and