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A Pinpunch Apparatus for Quantifying the Growth Rate Distribution in Monocot Leaves

Systems Ecol. Res. Group, San Diego State Univ., San Diego, CA 92182
Dep. of Soil Sci., Univ. of Wisconsin, Madison, WI 53706

^* Corresponding author.

The expansion of monocot leaves in the field is needed to understand the effects of various treatments on plant growth. A pinpunch method (sample destructive) is described that measures the growth rate distribution of the leaf. This method uses a surplus chart recorder, a linear potentiometer, and a data logger. Three sources of error are described in detail and data is presented that compares relative growth rate of plants with differing total water potentials. The relative growth rate as a function of distance from the node of the expanding leaf, can be determined.

Received for publication March 30, 1988.