The dynamic model of aperture behavior in leaf stomata of intact transpiring plants under constant environmental conditions is considered. The model is based on the supposed existence of feed-forward relations in the water-transport system: the decrease in root resistance – reduction in the capillary tension in the leaf apoplast – enlargement of the stomatal aperture. In parallel, there is a positive feedback relation: enlargement of the stomatal aperture – enhancement of transpiration – increase in the viscous flow through the root – intensified supply of dissolved oxygen to the respiratory centers of the root symplasm – elevation of turgor and the decrease in root resistance. Under the fulfillment of nonstringent physical requirementship, this system is capable of generating auto-oscillations with a period of 20–80 min. The model describes the relationship between the frequency–amplitude characteristics of auto-oscillations and the main parameters of the water-transport system in plants. In particular, the model presents a clue to one of the most intriguing phenomenon: the moistening of the root environment increases the frequency of auto-oscillations in some cases and reduces this frequency in others.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 8, 2004
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