Studies on inter-specific cross incompatibility of Jacarandaoriginated in tropical region

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We attempted interspecific crossing between J. mimosifoliaand J. cuspidifolia. A relatively high frequency of fruit set was observed in crosses of J. mimosifoliax J. cuspidifolia, whereas very little fruit set was observed in the reciprocal cross (J. cuspidifoliax J. mimosifolia). Based on microscopic observations, pollen tubes penetrated the style and reached the ovary in crosses of J. mimosifoliax J. cuspidifolia. On the other hand, few pollen tubes reached the ovary in J. cuspidifoliax J. mimosifolia crosses. Thus, it seems that pollen tube penetration was restricted in pistils somehow in this cross combination and few fertile seeds were obtained as a result.