Rice hydroponic fluid (Cock et al, 1976) was used for
planting rice seedlings which were treated with
different kinds of phytohormones after four weeks.
The concentrations of cytokinins, kinetin (KT), NPA
(auxin inhibitor, N-1-naphthylphalamic acid) and indole-
3-acetic acid (IAA) solutions were 100 ȝmol/L. The
concentration of GR24 (stigolactones) solution was 5
ȝmol/L. P-deficiency was achieved by treating plants
without phosphate in hydroponic fluid. Then, we sampled
the rice seedlings at 1, 4 and 18 h after treatment,
respectively. The seedlings were used to extract RNA
and perform quantitative real-time PCR (RT-qPCR)
for analyzing expression levels of the candidate genes
OsMAX1a and OsMAX1e. The RT-qPCR reactions
were prepared using iQ SYBR Green Supermix (BioRad).
For each reaction, 0.3 ȝmol/L of each primer and 1 ȝL
of 10-fold diluted template cDNA were used. The
amplification was detected using BioRad RT-qPCR
detection system and thermocycler. The expression
data were the average of three replicates. that OsMAX1a and OsMAX1e expressed stably in the
roots and stems of rice. Besides, the expression of
OsMAX1a was higher in roots than in stems, and the
expression of OsMAX1e was very stable in both roots
and stems (Fig. 2). However, OsMAX1b, OsMAX1c
and OsMAX1d only had weak or unstable expression
in the roots and stems. Thus, it is concluded that the
expression patterns of OsMAX1a and OsMAX1e are
closer to AtMAX1. Therefore, OsMAX1a and OsMAX1e
were target objects in subsequent studies