西亞試劑：OsPT2， a phosphate transporter， is involved in the active u

OsPT2， a phosphate transporter， is involved in the active uptake of selenite in rice

Lianhe Zhang1，*， Bin Hu2，3,Wei Li1， Ronghui Che2，3， Kun Deng1， Hua Li2，3， Feiyan Yu1， Hongqing Ling4， Youjun Li1， Chengcai Chu2，3，*

Selenite is a predominant form of selenium (Se) available to plants， especially in anaerobic soils， but the molecular mechanism of selenite uptake by plants is not well understood.

ltn1， a rice mutant previously shown to have increased phosphate (Pi) uptake， was found to exhibit higher selenite uptake than the wild-type in both concentration- and time-dependent selenite uptake assays. Respiratory inhibitors significantly inhibited selenite uptake in the wildtype and the ltn1 mutant， indicating that selenite uptake was coupled with H+ and energy-dependent. Selenite uptake was greatly enhanced under Pi-starvation conditions， suggesting that Pi transporters are involved in selenite uptake.

OsPT2， the most abundantly expressed Pi transporter in the roots， is also significantly up-regulated in ltn1 and dramatically induced by Pi starvation. OsPT2-overexpressing and knockdown plants displayed significantly increased and decreased rates of selenite uptake， respectively， suggesting that OsPT2 plays a crucial role in selenite uptake. Se content in rice grains also increased significantly in OsPT2-overexpressing plants.

These data strongly demonstrate that selenite and Pi share similar uptake mechanisms and that OsPT2 is involved in selenite uptake， which provides a potential strategy for breeding Se-enriched rice varieties.

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