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Resistance in sorghum to shoot fly Atherigona soccata: Evidence for the source of leaf surface wetness
Authors:S SIVARAMAKRISHNAN  P SOMAN  K F NWANZE  Y V R REDDY  D R BUTLER
Institution:International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India;*Farm Division, M/s Valli Textile Mill, Venkateswarapuram, Sattur 626 203, Tamil Nadu, India
Abstract:Leaf surface wetness (LSW) of the central whorl leaf of sorghum seedlings has been associated with susceptibility to shoot fly. Previous physical and physiological evidence suggested that LSW originates from the plant. This was confirmed by radioactive labelling methods using tritium and carbon-14. Tritiated water applied to the soil of potted seedlings was translocated to the surface of the whorl leaf. There were significant differences in the amount of tritiated water collected from susceptible (CSH 5) and resistant (IS 18551) genotypes. Studies with carbon-14 labelling of sorghum seedlings indicated the presence of (small amounts of) solutes in the surface water that may affect larval movement and survival.
Keywords:Shoot fly  sorghum  leaf surface wetness  radiolabelling
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