Abstract
Roots of one year old grape cvs. Concord, White Riesling, Grenache and Semillon were frozen to 0, -5, -10, -15 and -20°C in a programmable freezer. The tops were protected from cold by insulating them. For survival test, 4 plants of each cv. were planted in the greenhouse and their growth observed. Differential thermal analysis (DTA), using a computer attached to a programmable freezer was performed on roots. To aid in the interpretation of DTA, triphenyltetrazolium chloride (TTC) was performed. Hardiness determinations were based on DTA, TTC and the survival tests. DTA patterns representing exothermic response showed an exotherm associated with extracellular free water in tissue which appeared at about the same temperature range for all cvs. This is not associated with hardiness. Additional minor exotherms related to hardiness appeared at lower temperatures than the extracellular water exotherm. Their location differed from one cv. to another. Based on these tests, Concord roots appear to be hardier than other cvs. with important but minor differences in the hardiness of other cvs.
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Claims 6
Claim · model-written summary
In grape roots, the DTA exotherm associated with extracellular free water appeared at about the same temperature range for all cultivars.
Verbatim
e0“DTA patterns representing exothermic response showed an exotherm associated with extracellular free water in tissue which appeared at about the same temperature range for all cvs”
e1“grape”
Claim · model-written summary
The extracellular water exotherm is not associated with hardiness.
Verbatim
e0“This is not associated with hardiness”
e1“grape”
Claim · model-written summary
Additional minor exotherms related to hardiness appeared at lower temperatures than the extracellular water exotherm.
Verbatim
e0“Additional minor exotherms related to hardiness appeared at lower temperatures than the extracellular water exotherm”
e1“grape”
Claim · model-written summary
The location of the hardiness-related minor exotherms differed from one cultivar to another.
Verbatim
e0“Their location differed from one cv. to another”
e1“grape”
Claim · model-written summary
Concord roots appear hardier than the roots of the other cultivars.
Verbatim
e0“Concord roots appear to be hardier than other cvs.”
e1“grape”
Claim · model-written summary
The other cultivars showed important but minor differences in root hardiness.
Verbatim
e0“important but minor differences in the hardiness of other cvs”
e1“grape”