Promising allelopathic rice lines derived from the recombinant inbred lines of nongan/sathi cross Junaedi A., Chozin M. A., Lontoh A. P., Salam Md. A.1, Lee S. B.2, Kim K. H.3, Kim E. H.3, Chung I. M.3,* Department of Agronomy and Horticulture, Bogor Agricultural University, IPB Darmaga, Bogor, Indonesia-16680 1Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh 2National Institute of Crop Science, RDA, Suwon, 441–857, Republic of Korea 3Department of Applied Life Science, College of Life and Environmental Science, Konkuk University, Seoul143–701, Republic of Korea * Correspondence author: E-Mail: imcim@konkuk.ac.kr
Online published on 7 November, 2012. Abstract Rice plants that exhibit allelopathic behavior represent potential options for sustainable weed management. Previous studies have shown that the Sathi rice variety (an indica-type) shows high allelopathic potential (HAP), whereas the Nongan rice variety (a japonica-type) shows low allelopathic potential (LAP). Hence, in this study, we assessed the F6 and F7 generations of 180 recombinant inbred lines (RILs) derived from crossing Nongan/Sathi planted in Seoul, Korea. A laboratory assessment (double pots allelopathy bioassay) and a field assessment (rice ratoon interplanting barnyardgrass seedling) were used to screen the allelopathic potential of the rice cross. Both methods used barnyardgrass (Echinochloa crus-galli Beauv. var. frumentaceae) as a plant (weed) indicator to evaluate how rice suppressed plant growth. The results indicated that some prospective lines have HAP, exhibiting high suppression of barnyardgrass height and shoot dry-weight. Further selection for desired agronomical characteristics was performed for F8 RILs in the field in Korea, with some selected F9 lines exhibiting HAP and LAP during repeated planting in Bogor, Indonesia. The allelopathic potential of the Nongan/Sathi rice cross was confirmed on F10 RILs by evaluating agronomic performance. Through this multi-generation work, some promising lines derived from japonica and indica rice-types exhibiting high and low allelopathic traits, may be used in closely monitored agronomic field trials. Top Keywords Allelopathy, barnyardgrass, breeding, Echinochloa crusgalli, low input, rice, screening, sustainable weed management. Top |