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This article in AJ

  1. Vol. 73 No. 3, p. 423-426
    Received: July 21, 1980

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Freezing Cold-tolerant Parental Clones of Sugarcane1

  1. P. Y. P. Tai2



Sugarcane (a complex hybrid of Saccharum spp.) deteriorates after freezing damage. Efforts have been made to introduce the cold tolerance of S. spontaneum L. into commercial types. Six cold-tolerant clones of F1 (commercial cultivar ✕ S. spontaneum) and BC1 progenies were used to evaluate the deterioration of Sugarcane after artificial freezing and to compare the deterioration characteristics of their crusher juice quality with those of two commercial cultivars. The characteristics of juice quality studied were pH, titratable acidity, percent sucrose, percent purity, and kg of sugar per metric ton of cane. Stalks were exposed to −4.4 to −5.0 C for 6 hours. Samples were ground at Week 0 (immediately after harvest) and at 1, 2, and 3 weeks after freezing. The juice of fresh cane, Week 0, of the six cold-tolerant clones had higher pH and titratable acidity and lower percent sucrose, percent jurity, and kg of sugar per metric ton of cane than did that of either commercial cultivar (‘CP 57-526’ or ‘CP 63-588’). Low positive correlations between titratable acidity measurements made at the start and end of various time periods after freezing of sugarcane stalk samples indicate that the deterioration hi titratable acidity between sampling dates was either independent or associated in a loose manner. Titratable acidity for all six cold-tolerant clones increased relatively slowly during the first 2 weeks after freezing. Titratable acidity after freezing is more indicative of cold damage than is percent sucrose, and selecton of clones for cold tolerance might be made more rapidly if titratable acidity were used as the selection criterion.

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