Analysis of QTLs for panicle exsertion and its relationship with yield and yield-related traits in rice (Oryza sativa L.)

Abstract

ABSTRACT. Panicle exsertion (PE) is an important morphological trait that is closely associated with spikelet fertility and grain yield. To understand the genetic basis of PE and its relationships with yield and yield-related traits, a recombinant inbred population consisting of 240 lines derived from a cross between an Indica cultivar 'Kasalath' and a Japonica germplasm 'TD70', was studied over two years. PE was significantly correlated with plant height, heading date (HD), panicle length (PL), and panicle characteristics such as primary branch number, spikelet number per panicle, and spikelet density, but showed poor correlation with yield components. Based on linkage mapping of 141 SSR markers, a total of 38 quantitative trait loci (QTLs) were located for 12 investigated traits, with the contribution varying from 6.51 to 8.61%. Among these, four QTL clusters were identified on chromosomes 1, 2, 3, and 6, suggesting the existence of pleiotropic alleles. In some intervals, two loci for PE were collocated with several traits, which is consistent with the correlations observed with phenotypic variations. The PE QTLs with 'Kasalath' alleles and without pleiotropic effects would be valuable for the improvement of PE in 'TD70' and in other rice varieties.

Assessment of Agro-morphological Characters among Complete Panicle Emergence Mutants of Samba Mahsuri (BPT-5204)

“…Similar results were also reported by Shishir Sharma et al [44] and [48,49]. Current study reveals that DFF had a highly significantly negative correlation with CPE, which was similar to the results reported by [39,21,22]. However, in this current study we found that DFF had significantly negative correlation with PH, TGW, FLL and FLW.…”

“…58, before and after planting, respectively and, at ICRISAT Patancheru Hyderabad. Complete panicle emergence in mutants was measured at the time of maturity from the base of panicle to the tip of the last spikelet Zhan, Chengfang et al [21] and Zhao, C. F. et al [22]. The mutant lines panicle internodes were emerged completely from the flag leaf.…”

“…Complete panicle exsertion was measured in centimeters at the maturity stage of the plant. Complete panicle exsertion was measured from the flag leaf to the panicle base using a ruler Zhan Chengfang, et al [21] and Zhao, C. F. et al [22]. Grain length and breadth of CPE mutants was measured with a vernier caliper Hailiang Mao.…”

“…Correlation studies for a number of agronomic traits with panicle exsertion (PE) have been reported by Yang et al [42] and Hori et al [31]. Earlier researchers reveal that the panicle exsertion was positively correlated with PH, PL, and TGW [39,21,22]. It implies that PE plays a crucial role in the regulation of grain weight.…”

Morphological diversity of panicle traits in Kam fragrant glutinous rice (Oryza sativa)

“…The panicle traits are the most intuitive and representative rice plant part that is utilized in determining its identity and genetic diversity, as well as in estimating rice yield and quality (Chen et al 2001;Ma et al 2006;Wu et al 2016). Therefore, the characterization of rice panicle traits in relation to agricultural production and genetic diversity has long been an important research topic (Zhou et al 2003;Wang et al 2007;Zhou et al 2014;Zhao et al 2016;Adriani et al 2016). As the study of genetic diversity of morphological traits can directly provide information on germplasm richness and provide important information for farmers or breeders especially when the resource population is large, using morphological traits to study genetic diversity is considered as a very simple and economical approach.…”