Study of 32P uptake as an indicator in screening test for drought tolerance in wheat cultivars.

摘要

In a hydroponic experiment, 8 wheat cultivars were grown under osmotically stressed (-2.5 bar, induced by 0.1 M mannitol) or unstressed conditions and the 32P uptake (uptake/unit time) was determined. The aim of the study was to relate the P uptakeunder moisture stress to drought tolerance. Drought tolerant cultivars had low P uptake under controlled (non-stress) condition. Under moisture stress, the absorption and, to a greater extent, translocation of 32P was inhibited. Inhibition of these processes was lower in cultivars more tolerant to water stress, and it is suggested that 32P uptake could be used as an indicator of drought tolerance.