Fig. 5.

Growth and P concentration of bean hairy roots at two P levels. (A) Photograph of bean hairy roots grown at two P levels. Scale bars=1cm. (B) Fresh weight of bean hairy roots at two P levels. (C) P concentration in bean hairy roots. Bean hairy roots were grown in media containing 0 μM (–P) or 1.25mM (+P) KH₂PO₄ for 14 d. THe fresh weight and P concentration were measured. Each bar is the mean of four replicates with the standard error. Asterisks represent significant differences between overexpressing PvSPX and CK for the same trait in t-tests. *0.01<P≤0.05; **P≤0.01. OX1 and OX2 indicate two transgenic bean hairy root lines overexpressing PvSPX1, PvSPX2, or PvSPX3. CK1 and CK2 indicate the two transgenic lines transformed with the empty vector.