Depositing capacity of winter wheat stem segments under natural drought during grain filling in Ukrainian forest steppe conditions

Drought is a major abiotic factor adversely affecting wheat productivity. Water deficit reduces significantly photosynthesis and hence the remobilization of stored assimilate reserves from stem becomes important sources for grain filling. We assessed ability different internodes leaf sheaths to deposit remobilize reserve assimilates as well their role in yield formation 6 winter varieties under drought conditions during period The dry weight content water-soluble carbohydrates matter main shoot was determined at anthesis, beginning milk ripeness full ripeness. total amount segments calculated product specific segment its mass. remobilized each estimated difference between appropriate values anthesis or maximum accumulation reached early most productive Kyivska 17 Horodnytsia had largest all internodes. Depositing capacity second third (counting top) higher compared others has significant effect on productivity studied. Despite variability strong genotype x year interaction relationships depositing traits productivity, mainly tight correlations were found with per spike. obtained data suggests that deposited an contributing filling arid more detailed studies individual can be useful development breeding tools further genetic improvement.