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Table 2 Vegetative development state of ‘Sonata’ plants after exposure to different temperatures and photoperiods for 5 and 10 weeks, with or without subsequent chilling for 6 weeks in the dark at 2 °C as indicated

From: Dynamics of dormancy regulation in ‘Sonata’ strawberry and its relation to flowering and runnering

Temperature Photoperiod Duration of treatment Chilling No. of leaves Petiole length No. of runners Leaf area (mm2)
(°C) (h) (weeks)  (weeks) plant−1 (cm)a plant−1 Leaf #1 Leaf #2 Leaf #3 Final leaf
6 10 5 0 18.0 ± 7.1 20.8 ± 7.5 8.4 ± 6.9 57.5 ± 2.7 105.3 ± 2.4 139.5 ± 2.6 97.8 ± 3.4
    6 17.1 ± 9.1 27.9 ± 5.7 7.8 ± 9.7 64.2 ± 3.0 112.8 ± 2.9 149.0 ± 3.4 128.5 ± 2.4
    Mean 17.5 24.4 8.1 60.8 109.1 144.2 113.1
   10 0 17.4 ± 6.4 27.4 ± 6.8 3.3 ± 8.0 32.6 ± 3.6 62.9 ± 3.1 108.9 ± 2.7 131.5 ± 3.3
    6 17.9 ± 7.5 25.6 ± 8.9 4.4 ± 9.8 50.4 ± 3.0 91.7 ± 2.7 123.0 ± 2.7 126.6 ± 2.6
    Mean 17.7 26.5 3.9 41.5 77.3 115.9 129.0
  18 5 0 15.8 ± 8.2 22.6 ± 8.0 6.3 ± 8.4 55.2 ± 3.7 108.2 ± 2.9 139.8 ± 3.9 107.2 ± 2.9
    6 15.9 ± 8.2 29.2 ± 6.6 5.8 ± 8.5 55.7 ± 3.4 106.9 ± 2.9 149.4 ± 3.0 145.7 ± 2.7
    Mean 15.9 25.9 6.1 55.5 107.5 144.6 126.4
   10 0 15.8 ± 7.6 26.3 ± 7.7 2.5 ± 8.9 32.7 ± 4.1 68.2 ± 2.5 106.2 ± 3.0 140.2 ± 3.5
    6 17.6 ± 6.5 28.6 ± 6.7 3.9 ± 9.8 56.5 ± 3.6 102.2 ± 3.5 127.8 ± 3.2 120.1 ± 2.9
    Mean 16.7 27.5 3.2 44.6 85.2 117.0 130.2
18 10 5 0 25.8 ± 8.4 22.5 ± 9.1 5.4 ± 9.6 42.9 ± 4.7 64.4 ± 3.7 78.3 ± 3.2 93.3 ± 3.5
    6 21.5 ± 6.9 18.5 ± 6.4 5.2 ± 8.7 40.9 ± 4.5 68.1 ± 3.8 89.2 ± 3.5 88.1 ± 2.5
    Mean 23.6 20.4 5.3 41.9 66.2 83.7 90.7
   10 0 28.6 ± 5.4 15.6 ± 6.5 0.0 ± 0.0 14.4 ± 7.5 20.6 ± 5.7 26.2 ± 6.6 43.0 ± 5.5
    6 24.3 ± 6.0 25.2 ± 7.2 2.3 ± 9.3 34.9 ± 3.6 70.3 ± 3.3 90.0 ± 2.7 112.4 ± 2.2
    Mean 26.4 20.4 1.2 24.6 45.4 58.1 77.7
  18 5 0 16.6 ± 9.8 17.9 ± 8.2 8.9 ± 9.8 107.8 ± 3.1 131.0 ± 2.7 124.0 ± 2.6 124.8 ± 2.9
    6 19.7 ± 7.4 13.9 ± 7.8 10.1 ± 9.9 62.2 ± 3.5 77.1 ± 3.4 91.7 ± 3.7 96.7 ± 2.8
    Mean 18.1 15.9 9.5 84.9 104.1 107.9 110.8
   10 0 34.6 ± 5.5 14.8 ± 7.8 6.8 ± 6.9 49.0 ± 5.7 56.8 ± 4.0 61.5 ± 4.2 62.0 ± 3.9
    6 31.0 ± 6.5 24.1 ± 5.9 9.4 ± 9.8 62.2 ± 2.9 89.0 ± 3.4 97.7 ± 3.2 109.6 ± 3.2
    Mean 32.8 19.1 8.1 55.6 72.2 79.6 91.2
Probability level of significance (ANOVA)
 Source of variation
  Temperature (A) 0.004 0.003 n.s n.s 0.01  < 0.001 0.004
  Photoperiod (B) n.s n.s 0.01 0.004 0.01 0.003 < 0.001
  A × B n.s 0.006 0.003 0.004 0.02 0.004 0.004
  Duration of treatment (C) < 0.001 0.04 < 0.001 < 0.001 < 0.001 < 0.001 0.006
  C × A < 0.001 n.s n.s n.s n.s n.s < 0.001
  C × B < 0.001 n.s 0.03 n.s n.s n.s 0.001
  C × A × B < 0.001 n.s n.s 0.04 n.s n.s n.s
  Chilling (D) n.s < 0.001 0.002 0.01 < 0.001 < 0.001 < 0.001
  D × A 0.01 n.s 0.03 < 0.001 0.03 n.s n.s
  D × B 0.02 n.s n.s 0.001 < 0.001 < 0.001 0.03
  D × C n.s 0.001 0.001 < 0.001 < 0.001 < 0.001 0.02
  D × A × B n.s n.s n.s 0.001 < 0.001 < 0.001 n.s
  D × A × C 0.02  < 0.001 n.s 0.002 < 0.001 < 0.001 < 0.001
  D × B × C n.s n.s n.s 0.002 0.004 n.s n.s
  D × A × B × C n.s n.s n.s n.s n.s n.s n.s
  1. Data recorded after 10 weeks of forcing at 20 °C and 20-h photoperiod. The data are the means ± SE of three replications with four plants each
  2. n.s. not significant
  3. aPetiole length of the last fully developed leaf
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CABI Agriculture and Bioscience

ISSN: 2662-4044

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