Genetical studies on allelopathic activity and yield component in some lines of hybrid rice against barnyardgrass weed under Nitrogen stress

Twenty three hybrids were used to know the relationship between rice varieties and weeds (barnyardgrass) under two different nitrogen (N) levels in hydroponics. Some crosses had higher percentage for allelopathic activity as follow; IR69625A × Rikuto Norin 22, IR69625A × Giza 179 and IR69625A × HR 195 and their values were 87, 85 and 85 %, respectively. The varieties Rikuto Norin22, Giza 179 and HR 195 exhibited the highest activity against E. crus-galli during two seasons 2014 and 2015. These results showed highly genetic effect for these traits while the environmental effect is not significant. The additive and dominance genetic variances could be important in the inheritance of allelopathic characters. Rice variety Giza 179 showed high allelopathic activity to suppress grow of barnyardgrass at low N level in culture solution. Although rice variety Giza 179 has restoring fertility but it also exhibited high allelopathic activity under field conditions. Low nutrient growth levels also increased allelopathic activity and allelochemicals (momilactone B) concentrations in rice seedlings. Momilactone B secrate and increase in the culture media through growing barnyardgrass and rice together. We recommended to cultivate the hybrid IR69625A x Giza 179 to increase yield and allelopathic activity.

Author(s): El Shamey EAZ

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