What is Proton Transport Concept in Stomata?

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Levitt in 1974 has proposed a synthetic theory on the mechanism of stomatal movement taking all earlier observations into account. The observed facts are:

(a) During opening of stoma, starch disappears from the guard cells.

(b) Photoactive opening is dependent on the chloroplast of the guard cells.

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(c) Low C02 concentration causes stomatal opening.

(d) High pH in guard cells cause stomatal opening.

(e) There is a direct relation between K+ accumulation and stoinatal opening.

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