The Reduction of pH and recovery prom chlorosis in Fe‐stressed sorghum seedlings: The principal role of adventitious roots

Abstract

Sorghum (Sorghum vulgare Pers. cv. CSH‐5) seedlings were grown in complete nutrient medium and Fe‐stress was induced by transferring to minus Fe medium, in such a way that the seminal and adventitious roots were separately placed in two containers. It was found that the pH of the medium was reduced to 3.5 by the adventitious roots, and not by the seminal roots. It is suggested that the “signal” from the chlorotic leaves was transmitted to the adventitious roots and not to the seminal roots. Further, the adventitious roots have the capacity to produce the “reductants”.

Key words:

• Fe‐stress
• chlorosis
• “reductants”
• sorghum
• adventitious roots
• seminal roots