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Question

According to Steward's starch hydrolysis theory, which one of the following is the principal reason for the opening of stomata during day time?

Efflux of

K^{+}

ions from guard cells under the influence of ABA hormone.

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Photosynthetic utilization of

C O_{2}

in guard cell.

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Influx of

K^{+}

ions into guard cells under the influence of ABA hormone.

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Conversion of sugar into starch in guard cell.

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Solution

The correct option is B Photosynthetic utilization of $C O_{2}$ in guard cell.
Starch hydrolysis theory is the classical theory for stomatal opening and closing. It was originally proposed by Sayre, 1923. According to this theory, guard cells contain starch, which is hydrolysed to form glucose under high pH caused due to reduced carbon dioxide concentration. The carbon dioxide concentration is reduced due to the process of photosynthesis. Glucose increases the osmotic concentration and hence, DPD of guard cells. The latter absorb water from epidermal cells, swell up and open the stomatal pore.

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