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The studies on Heat Acclimation and Heat Tolerance in Three sica Vegetable crops
Ming, Shu Ling
The objectives of this study are to evaluated heat tolerance of Chinese kale (Brassica oleracea L. var. alboglabra)、Pai-tsai( B. campestris L. var. chinensis) and mustard (B. juncea (L.) Czerniak. et Coss) by measuring electrolyte leakage of leaf tissue with conductivity method and to explored the physiological changes during 24hr of teat acclimation at 37℃. Results show the conductivity method could be significant distinguish heat tolerance in three species of Brassica crops after heat acclimation at 37℃ for 24hr; the abilities of heat tolerance could be expressed by heat killing time (HKT) at 50℃. With two hea6t tolerance and heat intolerance lines each of three vegetables crops under high temperture conditions were studies to adaptability of heat stress. After heat acclimation at (37/37℃) for 24hr and followed a continue high temperaure (40/40℃) for 9 days, the heat tolerance lines show a litter reduce in growth rate, or the same, but the heat intolerance lines significant reduce 50％∼80％. Significant positive correlation was found between HKT estimated by conductivity and relative fresh weight or relative dry weight of three Brassica vegetable crops. When the plant were grown at 32/27℃ till harvest, significant increases in the growth rate of heat tolerance lines in three Brassica vegetable crops were found. There were litte or small fractions in the water potential and photosynthesis rate in heat tolerance lines of three Brassica vegetable crops during 24 hr of heat acclimation,then recovered quickly upon deacclimation at 25/25℃. After 24hr heat acclimation, heat tolerance line in three Brassica vegetable crops, show significant increases in the amounts of soluble protein, free amino acid, nitrate and the activity of peroxidase. While the activities of nitrate reductase and glutamine synthetase maintain constant levels, the amounts of ammonia and the activity of acid phosphatase are decrease.
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