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United States Department of Agriculture

Agricultural Research Service

Title: Relationship of Internal Heat Necrosis to Specific Gravity

Authors
item Sterrett, Rikki - VIRGINIA TECH
item Henninger, Melvin - RUTGERS UNIVERSITY
item Haynes, Kathleen

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: May 18, 1999
Publication Date: N/A

Technical Abstract: Most high specific gravity potato chipping cultivars grown in the mid-Atlantic states are susceptible to internal heat necrosis (IHN), a physiological disorder of the tuber parenchyma tissue. The purpose of this study was to investigate the relationship between susceptibility to IHN and specific gravity. Twelve clones from 33 segregating tetraploid families were evaluated for both incidence and severity of IHN and specific gravity in replicated field plots in VA in 1994 and 1997. There was a highly significant correlation between incidence and severity of IHN in 1994 (r=-0.90, P<0.01) and 1997 (r=-0.89, P<0.01). The correlation between severity of IHN and specific gravity was low in 1994 (r=0.07, P=0.05) and in 1997 (r=0.002, P=0.95). Although the incidence and severity of IHN and specific gravity was greater in families with 'Atlantic' as a parent, there was no correlation between incidence or severity of IHN in most of the families. This suggests that the increased susceptibility to IHN in segregating families with 'Atlantic' as a parent is due to some factor other than high specific gravity.

Last Modified: 9/10/2014
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