SCREENING OF DIFFERENT PROMISING LINES OF Brassica napus FOR THE GRAIN SHATTERING TOLERANCE

Abstract

To evaluate ten advanced lines of rapeseeds (Brassica napus L.) against shattering tolerance, a study was carried out in split plot design in the research area of Barani Agricultural Research Institute; Chakwal, Pakistan during two rabi growing season 2011-12 & 2012-13 under rainfed conditions. Main plot was harvested in four different harvesting dates including:  HD₁ = Harvesting at physiological maturity of crop, HD₂= 10 days after the first harvesting of each advanced line, HD₃= 20 days after the first harvesting of each advanced line, HD₄= 30 days after the first harvesting of each advanced line. The difference of grain yield of each advanced line in various harvesting dates in comparison to its grain yield in first harvesting date (HD₁-HD_i) were measured as indices of shattering. Combine analysis of variance of two year revealed that all genotypes were significant different for harvesting date, harvesting date x advanced lines interaction effect and also year and its interaction effects to each studied factors. In the present investigation, the significant difference of genotypes x harvesting dates demonstrated different level of shattering of all advanced lines in different harvesting dates. The quantity of grain yield shattering loss was increased in 3^rd and 4^th harvesting dates. On the basis of shattering tolerance among all the advanced line 10CBN005 was more tolerant to shattering and 8CBN002 was relatively more susceptible to shattering.