Table 2 Changes in the starch content in iceberg lettuce plants caused by treatments with different concentrations of putrescine and chitosan–putrescine nanocomposite (Put 1 mM–1 mM putrescine; Ch–Put 1 mM–1 mM chitosan–putrescine nanocomposite; Put 2.5 mM–2.5 mM putrescine; Ch–Put 2.5 mM–2.5 mM chitosan–putrescine nanocomposite; deionized water served as a control—Control) at two temperatures (4 °C and 20 °C).

From: Exogenously applied putrescine and chitosan–putrescine nanocomposite alleviate the negative effects of chilling stress on iceberg lettuce seedlings

Treatments

Starch (µM/g fw)

20 °C

4 °C

Control

8.310 ± 0.459a

5.693 ± 0.107a

Put 1 mM

5.317 ± 0.716a

7.529 ± 2.261a

Ch–Put 1 mM

5.051 ± 0.641a

7.607 ± 2.062a

Put 2.5 mM

5.920 ± 1.145a

6.406 ± 0.243a

Ch–Put 2.5 mM

5.596 ± 0.051a

5.763 ± 0.101a

  1. Different letters for a particular parameter indicate significant differences according to Fisher’s LSD test (p ≤ 0.05). The values presented here are the means ± SEs (n = 3).
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