Influence of salicylic acid on the growth of lettuce (Lactuca sativa var longifolia) during reduced leaf water potential

  • A.E. Bankole
  • C.E. Umebese
  • R.T. Feyisola
  • T.O. Bamise
Keywords: Water stress, Salicylic acid, Growth, Lactuca sativa


Salicylic acid (SA) a signal molecule which is responsible for inducing defense mechanisms in plants and also has a protective role in stress sensitivity. A study was conducted to determine the effect of water deficit stress on the growth of Lactuca sativa L. (Lettuce) using SA (1 mM and 3 mM) during reduced leaf water potential. Plants were subjected to 7 days drought after four weeks of growth. Stressed plants exhibited a lower leaf water potential (ψw) of -0.499 MPa as compared with the control (ψw of -0.460 MPa). Plants with lower leaf ψw exhibited reduction in almost all the parameters studied: 1 mM SA foliar treatment caused increase of 8 % in plant height and 53.16 % in plant biomass. Foliar treatment of 3 mM SA of the relative water content stimulated 13 % increase in the growth as compared to the control plant which was statistically significant at P<0.05. Overall, SA in stressed plant exhibited higher ameliorative capacity which has the beneficial role of mediating defense response in plants under stress.

Keywords: Water stress, Salicylic acid, Growth, Lactuca sativa


Journal Identifiers

eISSN: 2659-1502
print ISSN: 1119-8362