外源MeJA和BR对番茄种子萌发及幼根生长的影响

以番茄‘新红49号’种子为试验材料，研究不同浓度梯度的外源茉莉酸甲酯（Methyl jasmonate，MeJA）和油菜素内酯（Brassinolide，BR）对番茄种子萌发的影响。研究结果表明:与对照组相比，5×10-5 μmol/L的MeJA处理对种子的萌发最佳，5×10-6 μmol/L的MeJA对根长有促进作用，但抑制芽的生长；1×10-5 μmol/L的BR处理下种子萌发率最高，且此浓度显著促进根和芽生长；激素混合处理中，MeJA浓度为5×10-4 μmol/L和BR为1×10-5 μmol/L处理对种子萌发促进效果最为明显，且5×10-4 μmol/L MeJA和1×10-5 μmol/L BR对根和芽长具有促进作用。研究可知，单激素处理对种子萌发和根长、芽长促进效果优于双激素处理，因此，适当浓度的MeJA和BR对番茄种子萌发具有促进作用。 

Effects of Exogenous MeJA and BR on Tomato Seed Germination and Root Growth

Using tomato ‘Xinhong 49’ seeds as experimental materials，effects of different concentration gradients of exogenous methyl jasmonate（MeJA）and brassinolide（BR）on germination of tomato seeds were studied.Results showed that:compared with control group，5×10-5 μmol/L MeJA treatment had the best effect on seed germination，and 5×10-6 μmol/L MeJA promoted root growth，but inhibited growth of buds；under the BR treatment of 1×10-5 μmol/L，germination rate of seeds was the highest，and this concentration significantly promoted growth of roots and buds；in hormone mixed treatment，concentration of MeJA 5×10-4 μmol/L and BR 1×10-5 μmol/L treatment had the most obvious effect on seed germination，and 5×10-4 μmol/L MeJA and 1×10-5 μmol/L BR could promote growth of roots and buds.Research showed that single hormone treatment has better effect on seed germination，root growth and bud growth than dual hormone treatment.Therefore，MeJA and BR at appropriate concentrations could promote tomato seed germination.