Table II.

Within-plant mobility of foliar-applied10B

Line10B Excess in Top Leaf10B Excess in Seed
S1156.4  ± 9.4156  ± 25
SR11.4  ± 1.10.3  ± 1.1
A43.5  ± 1.2−1.2  ± 1.5

Isotopically enriched boric acid (99.43% 10B:0.57%11B) was applied to three mature leaves of each tobacco line. B mobility was determined as a percentage of 10B atom excess (ratio of 10B/11B in treatment minus ratio of 10B/11B in control × 100). Experimental details are as described in Table I.