Root growth, Yield and Yield Components of Tomato under Drought Stress

Drought stress is one of the main problems regarding agricultural productions throughout the world، especially in arid and semi-arid regions like Iran. Manyresearchers studies various effects of drough stress on root and shoot parts of crop. But، there is not more information about root growth of tomato. In this study، the effect of drought stress on root growth، yield and yield components of tomato was investigated under greenhouse conditions. The experimental design was a randomized block design with four irrigation treatments comprising 100%، 80%، 60% and 40% of water requirement in three replications. Fruit weight، diameter and quantity، dry weight of shoot part، root volume، wet weight of root، dry weight of root and root length were measured at the end of growing season. Generally، drought stress had significant effect (p<0. 01) on yield، yield components and root attributes of tomato. Themaximum fruit weight (602. 53 g)، fruit quantity (9. 33)، diameter (4. 86 cm)، dry weight of shoot part (127. 64 g)، root volume (0. 38 L)، wet weight of root (268. 97 g)، dry weight of root (24. 25 g)، root length (239386 cm) and root area (33860 cm2) was corresponded to 100% water requirement treatment. In general، the results showed. The root volumehadmaximum correlated with yield and yield components of tomato.