Stomatal movement and potassium transport in epidermal strips ofZea mays: The effect of CO2

✍ Scribed by C. K. Pallaghy

• Book ID: 104756629
• Publisher: Springer-Verlag
• Year: 1971
• Tongue: English
• Weight: 866 KB
• Volume: 101
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00398115

✦ Synopsis

The correlation between stomatal action and potassium movement in the epidermis of Zea mays was examined in isolated epidermal strips floated on distilled water. Stomatal opening in the isolated epidermis is reversible in response to alternate periods of light or darkness, and is always correlated with a shift in the potassium content of the guard cells. K accumulates in guard cells during stomatal opening, and moves from the guard cells into the subsidiary cells during rapid stomatal closure. When epidermal strips are illuminated in normal air, as against C02-free air, the stomata do not open and there is a virtually complete depletion of K from the stomatal apparatus. In darkness C02-eontaining air inhibits stomatM opening and K accumulation in guard cells, but does not lead to a depletion of K from the stomata as observed in the light.