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The study of potassium ion rubidium 86 ion transport and compartmentation in roots of potassium deficiency tolerant rice cultivar

Xie S P.; Ni J S.; Li G F.

Acta Phytophysiologica Sinica 15(4): 377-381

1989


Accession: 007938228

In order to compare the mechanisms of K+(86Rb+) transport in and absorption by cultivars of indica rice tolerant and sensitive to potassium deficiency, the fluxes and the compartmentation of potassium in rice roots were studied. The results showed that potassium deficiency tolerant cultivar indica rice 73-07, with much higher Joc and Jcx as well as Koc and Kcx than those of potassium deficiency sensitive cultivar indica rice 80-66 (Table 1 and Table 3) was more efficient in K+(86Rb+) absorption and transport, although the two parameters related with tonoplast (KCV and KVC) had only little difference. The values of QC and QV in roots of indica rice 73-07 were also higher than those of indica rice 80-66. Taking K+(86Rb+) transport to shoot into account, tc/2 of indica rice 73-07 was only half of that of indica rice 80-66 (Table 2), which indicated that K+ (86Rb+) in the cytoplasm of roots of the former variety turned over more quickly than that of the latter. All the studied characteristics of indica rice 73-07 are favorable to the absorption of potassium by its roots from low potassium medium, which may account for its tolerance to potassium deficiency.

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