Abstract:

Tomato‘Daliang 5’and hairy mutant strain‘3-071’with high density of trichome were
used as experimental materials to investigate the relationship among exogenous GA，MeJA，IAA，SA and
KT and the levels of endogenous hormones as well as the density of different types of trichome.
Exogenous hormones were sprayed once 3 days. Leaves were sampled for measuring endogenous hormone
levels and observing characteristics of trichomes under microscopy. The results showed that exogenous
GA，MeJA and IAA in both varieties of tomato enhanced the levels of endogenous GA，MeJA and IAA，but reduced the levels of endogenous SA and KT in tomato. Exogenous GA，MeJA and IAA also increased
the number of trichomes types Ⅳ，Ⅵ trichomes. The densities of trichomes types Ⅳ has most
significant effect was presented for the 0.350 mg · L-1 GA，0.200 mg · L-1 MeJA treatment comparing with
the control. The densities of trichomes types Ⅵ has most significant effect was presented for the 35.000
mg · L-1 GA，0.200 mg · L-1 MeJA treatment comparing with the control. The densities of trichomes types
Ⅳ，Ⅵ in both varieties of tomato has significant effect in gradient of concentration IAA. In addition，
exogenous KT enhanced the levels of endogenous SA and KT，whereas reduced the levels of endogenous
GA，MeJA and IAA in tomato. Exogenous SA（0.015，0.150 and 1.500 mg · L-1）reduced the levels of
endogenous GA，MeJA and IAA，but enhanced the levels of endogenous SA and KT in tomato and reduced
the densities of trichomes types Ⅰ，Ⅳ，Ⅵ and 1.500 mg · L-1 SA had the most significant effect
comparing with control and the other treatments. In conclusion，exogenous hormones could affect the
concentration of endogenous hormones so as to regulate trichome formation in tomato.

Key words: tomato, trichome, hormone