Longitudinal variation in DNA of onion bulb epidermal nuclei.

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Abstract
Feulgen DNA of inner epidermal onion nuclei ranged from 1 .times. at the base of the onion bulb to 3.6 .times. at the equator to 1.8 .times. at the apex. This was compared to unpublished interference microscopy data which showed corresponding changes in nuclear area (cross section) from 1 .times. to 2.7 .times. to 2.0 .times., nuclear dry mass per unit area from 1 .times. to 1.5 .times. to 1.4 .times., and total nuclear dry mass from 1 .times. to 4.2 .times. to 2.8x from base to equator to apex, respectively. A regression of each of these 3 characteristics against relative DNA indicated that within the range of values given above, the interferometric characteristics reached maximum or stabilized as DNA reached high levels and continued to increase. Apparently nuclei tend to increase in these characteristics during plant development and these increases seem to be related to cell, organ, and plant size, age and location.

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