Chilling sensitivity of photosynthetic oil-seedlings. 2. Cucurbitaceae
1990
Bradow, J.M.
Seed germination and seedling emergence are particularly sensitive to low temperatures in oil-seed genera in which lipids are the main seed storage material, e.g. cotton, corn, cucumber, and watermelon. Growth of photosynthetic seedlings of oil-seed genera is also significantly affected by suboptimal temperatures. A photosynthetic seedling growth system used to demonstrate suboptimal temperature stress effects in cotton was modified to monitor the effects of temperatures from 10 to 35 degrees C upon the roots and aerial portions of cucumber, cantaloupe, and watermelon seedlings. Non-destructive measurements of fresh weights and the relative water contents of the roots and shoots of seedlings grown at 30 degrees C and at non-optimal temperatures, as well as chilled seedlings returned to 30 degrees C for one day, indicated significant intra-generic differences in temperature sensitivity and relative root and shoot water status of both the chilled seedlings and those recovering from thermal stress. The capacity to return to normal water status and resume growth differed between and within species and was correlated with recommendations for chilling tolerance.
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