Figure 3.

TPSI1 is specifically induced under Pi starvation. Hydroponically grown tomato plants were exposed to 4°C (Cold), 37°C (Heat), desiccation (Des.), salt stress (Salt), and Pi starvation (P−) for 4 d. RNA extracted from leaves and roots was subjected to northern-blot analysis with ³²P-labeled TPSI1 cDNA fragment as the probe. The ethidium bromide stained gel below shows uniform loading of RNA samples.