Soil salinity is one of the major abiotic stress threatening food security worldwide. More than 800 million hectares of land throughout the world are salt-affected, corresponding to more than 6% of the worlds' total land area. Saline soil is defined as having a high concentration of soluble salts which will affect plant growth. Salt concentration in soil is measured by electrical conductivity. The USDA Salinity Laboratory defines a saline soil as having an EC exceed 4 dS m-1. There are many natural and human factors contributing to increased salinity of soils. Several strategies have been tested to reduce the negative impact of salt stress on crop yield. Since 2014, AVRDC The World Vegetable Center launched a further effort to upgrade grafting technology through investigation and evaluation of a new and wider range of rootstocks to be sourced from among the germplasm collections of wild and cultivated species of Solanaceae currently held in the AVRDC genebank in Shanhua, Tainan, Taiwan. Also to study the effects of tomato variety and various scion/rootstock combinations on plant tolerance to salinity stress and marketable and nutritional quality of tomato fruits. The effect of seven different rootstocks was evaluated on two tomato (Solanum lycopersicum L.) scions Results showed that grafting successful rate is the first criteria of compatibility. Vegetative growth, flowering time were delayed by grafting and salinity. Grafting and salinity also affect fruit yield and quality.
