Heterosis In Rice Under Phosphorus Stress

Seven parental rice varieties, 3 exotic and 4 indigenous, involved in a diallel cross, revealed heterosis for grain yield components and root and shoot characters, under phosphorus stress conditions of northeastern hill region of India, Pawnbuh, an indigenous cultivar, revealed unidirectional dominance in respect of flag leaf area/plant, good grains/panicle, panicle weight, and grain yield/plant. Further, Pawnbuh in combination with Khonorullo, another local cultivar, gave the highest positive heterosis for grain yield/plant.