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Bulletin of the National Research Centre

Table 1 Effect of GA3 and melatonin on vegetative growth of two artichoke cultivars 70 DAT during the two growing seasons of 2017/2018 and 2018/2019

From: Response of two seed-grown artichoke cultivars to GA3 and melatonin treatments

Treatments

Plant height, cm

Leaf No. /plant

Leaf area, cm2

Leaf fresh W, g

Leaf dry W, g

Chlorophyll SPAD

First season (2017/2018)

 Cultivars

  Imperial Star (IS)

52.1 a

12.3 a

475 a

106.5 a

14.6 a

46.3 a

  Romanesco (R)

48.9 b

11.3 b

457 b

93.8 b

11.9 b

44.3 b

 Foliar application

  Melatonin

50.2 b

12.2 a

468 a

101.3 b

13.6 a

45.8 b

  GA3

52.2 a

13.2 a

471 a

102.8 a

13.7 a

47.0 a

  Control

49.2 b

10.2 b

458 b

96.8 c

12.6 b

43.3 c

 Interactions

  IS

Melatonin

52.0 a

12.7 a

478 a

107.1 a

15.1 a

46.7 a

GA3

54.0 a

13.7 a

483 a

109.9 a

15.2 a

48.0 a

Control

50.3 a

12.7 a

464 b

102.4 b

13.6 b

44.3 a

  R

Melatonin

48.3 a

11.7 a

458bc

95.6 c

12.1 c

45.0 a

GA3

50.3 a

12.7 a

460bc

95.7 c

12.1 c

46.0 a

Control

48.0 a

9.7 a

453 c

90.2 d

11.1 d

42.3 a

Second season (2018/2019)

 Cultivars

  Imperial Star (IS)

47.0 a

11.1 a

465 a

102.0 a

14.8 a

45.0 a

  Romanesco (R)

45.4 b

9.9 b

451 b

93.8 b

12.9 b

43.8 b

 Foliar application

  Melatonin

46.0ab

10.5ab

460 a

101.3 a

14.1 a

43.8 b

  GA3

48.3 a

11.2 a

462 a

102.8 a

13.9 a

47.3 a

  Control

44.3 b

9.8 b

453 b

96.8 b

12.5 b

42.0 b

 Interactions

  IS

Melatonin

46.7 b

11.3 a

466 b

102.0 a

15.4 a

44.7 a

GA3

49.3 a

12.0 a

473 a

101.7 a

14.5ab

48.0 a

Control

45.0 c

10.0 a

457 c

101.2 a

14.3 b

42.3 a

  R

Melatonin

45.3 c

9.7 a

453 cd

96.3 b

12.8 c

43.0 a

GA3

47.3 b

10.3 a

451d

97.3 b

13.2 c

46.7 a

Control

43.7 d

9.7 a

448 d

92.7 c

12.7 c

41.7 a

  1. Means within each column within main effects and interactions followed by the same letter are not significantly different at P < 5%
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