Abstract
Abstract Wild species are valuable resources in prebreeding programmes for broadening the genetic base and to identify novel genetic variants. In this study we used advanced backcross introgression lines (BILs) generated from Swarna/Oryza nivara cross. Fifteen BILs were evaluated for three seasons (kharif 2014, rabi 2015 and kharif 2015) for seedling vigour and yield related traits. Among these, seven BILs showed significantly higher yield over Swarna. G × E interaction analysis for yield traits in three environments showed that BILs 166-2-9S, 166-2-3S, 166-23S, 166-9S, 166S and 166-32S were stable with high means for different yield traits. BIL166-9S showed high seedling vigour and thousand grain weight (TGW) and BIL166-30S had high grain number in all three environments. BIL248S (DRR Dhan40) showed high single plant yield (SPY) and spikelet fertility (SPF) in both kharif seasons. Trait correlation showed significant positive correlation of panicle length with SPY and TGW. Days to fifty percent flowering (DFF) was significantly associated with thousand grain weight (TGW). Significant correlation was also observed between vigour traits and yield. In addition, seed germination percentage showed significant correlation with plant height and tiller number. Root length was associated with SPY and TGW. Molecular screening to detect the presence of yield related QTLs revealed that high yielding BILs 166-2-9S, 166-9S and 166-21S showed O. nivara alleles for two yield enhancing QTLs qyldp2.1 (RM250-RM535) and qyldp9.1 (RM434-RM257) reported previously. These stable BILs are useful in rice improvement and to fine map QTL/genes for seedling vigour and yield.
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