Tissue volume changes in black spruce phloem

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Abstract
Cell dimensions and volume changes were studied in black spruce phloem by microscopic techniques.It was found that sieve cells measure 4 mm in length and 30 μm in diameter and constitute on the average 52.2% of the volume of the inner bark. However, sieve cell volume decreases gradually from 62.8% at the cambium to 38.7% in the outer dead phloem as a result of the collapse of these elements. In contrast, the volume of longitudinal parenchyma increases from 28.7% at the cambium to 43.7% in the outer dead bark.Sclereids possessing thick and multilayered walls make up on the average 3.4% of the inner bark. Sclereid volume increases from 2.8% at the cambium to 9.6% in the outer bark. On the average, rays constitute 6.4% of the inner bark, increasing from 5.7% at the cambium to 8% in the outer bark as a result of dilation.

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