Author(s):

Suraj Kumar Hitaishi, SC Vimal and Amit Kumar Chaudhary

Abstract: Heterosis and inbreeding depression studies in rice were carried out on seventeen characters against two crosses: Cross I (NDRK 5004 × NUD 3) and Cross II (PANT 10 X IR 28) at Student’s Instructional Farm of Acharya Narendra Deva University of Agriculture and Technology, Narendra Nagar (Kumarganj), Ayodhya-224229 (U.P.), India. Heterosis of F1 hybrids over Standard parent and better parent varied from character to characters in the two crosses. Significant positive heterosis was observed for harvest index and grain yield per plant in both the crosses. Highest inbreeding depression was observed for grain yield per plant and lowest for biological yield per plant in Cross I. While highest inbreeding depression was observed for harvest index and lowest for leaf nitrogen in Cross II. Grain yield per plant in Cross I and spikelet per panicle in Cross II recorded high level of heterosis and inbreeding depression. Significance of dominance gene effects and epistatic interactions for most of the traits in six crosses indicated that exploitation of heterosis through hybrid varieties appears to be a potential alternative. The positive and significant heterobeltiosis was noted for panicle length and grain yield per plant in sodic conditions. Above studies suggested that for crop improvement it would be desirable to follow different selection methods/breeding methods to be improve varieties and yield also.

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