Nanophosphorus Fertilizer Stimulates Growth and Photosynthetic Activity and Improves P Status in Rice

الملخص EN

The efficiency of nanoparticles covered with type A gel and loaded with KH2PO4, as a source of P, was evaluated on growth, phosphorus concentration and accumulation, and photosynthesis-related parameters in rice plants (Oryza sativa L.

ssp.

indica) cv.

Morelos A-2010, under greenhouse conditions.

Plants were treated for 14 days with P concentrations equivalent to 50 and 100% of those established in the Yoshida nutrient solution.

Sources of P were KH2PO4, nano-KH2PO4, and nano-KH2PO4 with trypsin; control treatments were distilled water and nanoparticles with type A gel.

The solutions were renewed every 7 d.

Rice plants exhibited differential P absorption in function of the P source tested.

P supplied by KH2PO4 had a higher uptake rate than P supplied by nano-KH2PO4, alone or with trypsin.

Nevertheless, nano-KH2PO4 promoted higher physiological efficiency for P in both roots and shoots, which consequently induced higher biomass accumulation in these organs.

P concentration in shoots, as well as P accumulation in shoots and roots, were positively correlated with the photosynthetic rate.

Also, nano-KH2PO4 increased instant water use efficiency in rice plants.