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Radicle Length and Osmotic Stress Affect the Chilling Sensitivity of Cucumber Radicles

Mann Laboratory, Dep. of Plant Sciences, Univ. of California, Davis CA 95616-8631

View larger version (15K): [in a new window]   Fig. 1. Effect of radicle length at the time of chilling on the percentage inhibition of subsequent radicle elongation compared with nonchilled controls. The percentage above each shaded bar is the percentage reduction from the nonchilled control for that radicle length. The vertical line atop each bar represents ± SE (n = 6).

View larger version (33K): [in a new window]   Fig. 2. Elongation of (A) 1-mm-long and (B) 10-mm-long cucumber radicles during continuous exposure to various concentrations of aqueous mannitol solutions at 25°C. The vertical line associated with each mean represents ± SE (n = 12).

View larger version (19K): [in a new window]   Fig. 3. Length of cucumber radicles initially at the 1- or 10-mm length after 96 h in various concentrations of aqueous mannitol solutions at 25°C. The vertical bar represents the 5% LSD value. An exponential curve was fitted to the data from 0.0 to 0.6 M mannitol. The dashed line is the extension of the exponential curve to 1.0 M mannitol.

View larger version (45K): [in a new window]   Fig. 4. Elongation of 1- and 10-mm-long cucumber radicles after they were either held in 0.3 or 0.6 M mannitol for 0.2 or 24 h at 25°C before being grown at 25°C for 72 h or chilled at 2.5°C for 72 h and then held at 25°C for 72 h. Lengths were adjusted so that 0 represents the length of the radicle when they were moved into 25°C for 72 h of elongation. The portion of the bar above 0 is the elongation that occurred during the final 72 h at 25°C. The solid portion of the bar below 0 is the initial radicle length, while the open bar is the elongation that occurred during the mannitol treatment. The vertical line atop each bar represents ± SE (n = 12).

View larger version (19K): [in a new window]   Fig. 5. Effect of radicle length when chilled on the chilling-induced inhibition of subsequent radicle elongation. Points are identified by the radicle length at the beginning of the experiment (1, 10, 20, or 30 mm in length) and the mannitol concentration to which they were exposed before chilling (0.3, 0.5, 0.6 M; control is 0 M). Points were calculated from data presented in Fig. 4, and other data. Curve of the form CL = Co (1 – e–KL) fitted to data points (Co = 100, K = 0.12, L = radicle length when chilled) had an r of 0.96.

View larger version (20K): [in a new window]   Fig. 6. Relation between the rate of respiration and prior mannitol treatment. Respiration was measured after 1- or 10-mm-long radicles were exposed to 0.0, 0.3, 0.5, or 0.6 M mannitol for 24 h at 25°C. The vertical line atop each represents ± SE (n = 6).