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Drought-resistance in Pelargonium zonale

F. A. AMER and W. T. WILLIAMS
Annals of Botany
New Series, Vol. 22, No. 87 (JULY 1958), pp. 369-379
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42907435
Page Count: 13
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Drought-resistance in Pelargonium zonale
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Abstract

The small persistent leaves produced by Pelargonium when water is withheld have been investigated in respect of their production, structure, carbohydrate changes, and transpiration characteristics. It is concluded that these leaves show no special adaptations, but are merely normal leaves arrested in an immature condition. Their survival during drought is attributed to the incomplete vacuolation of the cells, and the findings are consistent with Iljin's views on the importance of mechanical protoplasmic damage, caused by excessive shrinking, in drought-injury.

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