Exogenous application of JA enhanced resistance of date palmto
Foa. Indeed, in the absence of JA treatment, 30% of the seedlings of
the resistant cultivar BSTN and 72% of the susceptible JHL died four
weeks after Foa inoculation. In contrast, pre-treatment with JA
three weeks before Foa infection, led to a reduction of plant
mortality by 17 and 40% in cultivars BSTN and JHL, respectively.
Treatment of date palm seedlings by JA at a concentration of 50 mM
led to the mortality of a 5–6% of seedlings