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Chilling Injury in Husk Tomato Leaves as Defined by Scanning Calorimetry by A Rascón-Chu; E Carvajal-Millán; R Garcı́a-Estrada; J.H Siller; J.J Martı́nez; V.M Guerrero; A.A Gardea is a Materials Science article available to read on EtoBox.

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Chilling injury is a common disorder to both tropical and some temperate species. Husk tomato plants (Physalis ixocarpa L.) were used to study chilling injury and de®ne temperature ranges at which such injury occurs. Greenhouse-grown `Cerro Gordo' husk tomato plants were used. Samples were taken from the ®rst true leaf of 1-month-old plants. Preliminary tests using electric conductivity (EC) were carried out to narrow a temperature range. Results indicated that 1 h exposure between 6 and 38C was enough for leaf tissue to increase ion leakage. Afterwards a differential scanning calorimetric assay was done in a range from 15 to 08C and a scanning rate of 78C h À1 . To include the effects of period and temperature exposure, a factorial experiment was carried out with exposures from 0 to 3 h at half an hour intervals, and isotherms were done at 0, 3, 6, 9, and 128C. Activity recovered (%) was estimated by comparison to activity at 258C. A highly signi®cant interaction between exposure and temperature was found, con®rming EC results. On average, exposures above 1 h and temperatures below 68C caused the lowest recovery in activity as de®ned by the algorithm Actrec (%)(97À16t2.5T)/(1À0.01

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Author

A Rascón-Chu; E Carvajal-Millán; R Garcı́a-Estrada; J.H Siller; J.J Martı́nez; V.M Guerrero; A.A Gardea

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0040-6031)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)