The Role of PpNAC187 in Pear Drought and Salt Stress

The hard-end of pear fruit might be a disorder of the environmental abiotic stress, which is mainly caused by the reduced water intake of the fruit resulting from climate drought. To explore the factors that cause fruit hard-end, two rootstocks of Pyrus betulaefolia and P. bretschneideri with different root absorptive capacity of water and nutrients were used as base stock of ‘Whangkeumbae’ ( P. pyrifolia ) pear fruit. The results showed that the incidence of hard-end fruit in ‘Whangkeumbae’ pear trees using rootstock with lower rate of water absorptive increased, indicating that this physiological disorder was related with water deficiency. PpNAC187 was selected from RNA-Seq carried out on the calyx end of with and without the hard-end symptom of different rootstocks. The transgenic tobacco overexpressing PpNAC187 showed higher tolerance with drought and salt stress, which might suggest that PpNAC187 acts an important role during the hard-end occurring caused by drought or salt stress.