Abstract: A new male sterile material of Chinese jujube ( Ziziphus jujuba Mill. ) was identified from natural population for the first time by test of pollen vitality and number and anatomy studies. The material without normal pollen in yellow buds was named Male Sterile 1 of Chinese jujube (JMS1). Microspore massed
and became disaggregated after tetrads during pollen development of JMS1. Then anthers became emp ty, or only pollen vestiges remained in yellow bud. So the pollen became abortive after tetrads. Hypertrophy and hyperplasia of tapetum at tetrads stage were related to pollen abortion. In view of itsmiddle fertility of embryo, big fruit, and early mature, JMS1 could be used as a worthful female parent in the hybridization breeding of Chinese jujube.

Key words: Chinese jujube, Male sterility, Germplasm, Pollen