Table 5 Effect of growth regulators and thermal regimes on number of sympodial branches per plant and boll weight (g) in field conditions during 2012 and 2013.

From: Exogenously applied growth regulators protect the cotton crop from heat-induced injury by modulating plant defense mechanism

Thermal regimes

Regulators

Fiber strength (g/tex) 2012

Fiber strength (g/tex) 2013

No. of sympodial branches (2012)

No. of sympodial branches (2013)

Boll weight (g) 2012

Boll weight (g) 2013

April

Control

27.5 b ± 2.6

25.2 b ± 2.4

19.1 b ± 1.23

20.0 b ± 142

3.4 b ± 0.30

3.6 b ± 3.4

H2O2 (30 ppm)

31.5 a ± 3.0

30.1 a ± 2.9

22.4 a ± 1.64

23.1 a ± 1.81

3.9 a ± 0.36

4.2 a ± 4.0

SA (70 ppm)

26.7 b ± 2.4

23.2 b ± 2.0

18.6 b ± 1.39

19.5 b ± 1.48

3.2 b ± 0.31

3.4 b ± 3.1

MLE (30 times diluted)

31.6 a ± 2.9

28.8 a ± 2.6

21.8 a ± 1.51

22.7 a ± 1.70

3.8 a ± 0.37

4.1 a ± 3.9

ASA (70 ppm)

31.2 a ± 2.8

28.8 a ± 2.5

21.7 a ± 1.43

22.6 a ± 1.59

3.9 a ± 0.38

4.2 a ± 4.2

May

Control

23.1 b ± 2.1

29.9 a ± 2.8

15.3 b ± 0.81

16.2 b ± 0.83

2.8 b ± 0.25

2.9 b ± 2.7

H2O2 (30 ppm)

28.2 a ± 2.7

30.6 a ± 2.7

18.0 a ± 1.33

19.1 a ± 1.28

3.3 a ± 0.29

3.4 a ± 3.2

SA (70 ppm)

22.1 b ± 2.0

30.1 a ± 2.6

15.4 b ± 0.82

16.5 b ± 0.84

2.9 b ± 0.26

2.9 b ± 2.6

MLE (30 times diluted)

28.1 a ± 2.6

28.7 a ± 2.4

17.9 a ± 1.34

18.9 a ± 1.31

3.3 a ± 0.32

3.5 a ± 3.1

ASA (70 ppm)

28.0 a ± 2.5

28.8 a ± 2.5

18.1 a ± 1.08

19.0 a ± 1.07

3.4 a ± 0.31

3.4 a ± 3.0

June

Control

29.6 a ± 2.9

29.3 a ± 2.8

12.4 a ± 1.38

12.8 a ± 0.74

2.5 a ± 0.22

2.6 a ± 2.5

H2O2 (30 ppm)

28.7 a ± 2.7

30.4 a ± 2.9

12.2 a ± 1.70

12.7 a ± 0.87

2.4 a ± 0.20

2.6 a ± 2.4

SA (70 ppm)

29.4 a ± 2.5

30.6 a ± 3.0

13.3 a ± 089

13.8 a ± 0.96

2.5 a ± 0.23

2.7 a ± 2.3

MLE (30 times diluted)

29.3 a ± 2.8

30.0 a ± 2.7

12.1 a ± 0.83

12.6 a ± 1.01

2.4 a ± 0.22

2.5 a ± 2.2

ASA (70 ppm)

27.2 a ± 2.4

29.2 a ± 2.5

12.3 a ± 0.70

12.8 a ± 0.87

2.4 a ± 0.21

2.5 a ± 2.4

LSD

3.46

2.02

2.14

2.04

0.37

0.41

  1. Mean of three replications (n = 3) ± SE and variants having same alphabets are not statistically significant at P˂ 0.05. Main factors and interaction are significant at P˂ 0.01. By using the LSD of the interaction between growth regulators and thermal regimes, lettering is done separately for each thermal regime.
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