Abstract: Parents of Indica hybrid rice,“TeA”,“Peiai64S” and “9311”,were sprayed with MeJA(methyl jasmonate) and MeJA+BA(6-benzyl adenine) before spikelet opening,with natural water as the control treatment and response of the rice to the treatments analyzed.MeJA and MeJA+BA significantly improve spikelet opening time and concentration degree,and shorten opening duration of “TeA”and “Peiai64S”.MeJA and MeJA+BA also has some effects on “9311”spikelet opening time and duration.Both MeJA and MeJA+BA have similar tendencies in effect on opening time and duration.MeJA decreases spikelet opening angle and the distance between opened spiklet tips of the three parent hybrids while MeJA+BA slightly increases such effects on the above arameters.On the whole,MeJA and MeJA+BA have no significant effects on plant height,flag leaf length,and exposed panicle length of the three parent rice.