Mineral Ion Contents, Solute Release and Aspects of Ion Transport in Embryos from Germinating Low and High Vigour Wheat (Triticum aestivum)

Both low and high vigour seed lots were more than 90% viable when germinated at 25 °C. The tissue weights and the contents of mineral ions and glycinebetaine in the ungerminated embryos were the same for each lot. The release of K+ and phosphate ions from isolated embryos into aqueous media were also the same. These similarities remained for at least 36 h of germination. At 48 h the coleoptiles of the low vigour embryos were about 20% shorter and their fresh weight was about 30% less than those of the high vigour embryos. These differences were reduced again to about 10% at 72 h. In contrast to these differences, H+ efflux and 86Rb+ uptake by isolated embryos were up to 50% slower in low vigour embryos compared with the high vigour ones. The difference was maximal at 24 h of germination and appeared to depend upon the anion presented and the pH of the incubation medium. The H+/86Rb+ exchange ratio was not, however, changed in low vigour embryos compared with high vigour ones.

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