Genetic base of paddy rice cultivars of Southern Brazil

Abstract

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Genetic characterization and population structure of Indian rice cultivars and wild genotypes using core set markers

“…Early maturing varieties viz, Rasi and Tulasi with a common pedigree in their breeding grouped in a sub cluster with a similarity index of more than 67 % (Ravidra Babu et al 2015 ). Similarly the study on genetic diversity of Venezuelan cultivars by Herrera et al 2008 and diversity of Brazilian rice cultivars by Raimondi et al 2014 , demonstrated the narrow genetic base of the cultivars developed in their respective countries which can lead to genetic vulnerability to any emerging stress conditions.…”

“…Many researchers evaluated genetic diversity of Indian rice germplasm using other SSRs, but SSRs from UCGM have not been used for studying diversity previously (Saini et al 2004 ; Jain et al 2004 ; Ram et al 2007 ; Sundaram et al 2008 ; Kumar et al 2010 ; Sivaranjani et al 2010 ; Vanniarajan et al 2012 ; Yadav et al 2013 ). Studies were also conducted globally on classifying rice genotypes based on their genetic diversity and population structure using molecular markers (Garris et al 2005 ; Zhao et al 2010 ; Jin et al 2010 ; Li et al 2010 ; Zhang et al 2011 ; Wang et al 2014 ; Raimondi et al 2014 ; Shinada et al 2014 ). Most of the diversity studies in rice mainly focused on clustering within cultivated rice group and only few studies were reported using accessions from wild rice species in diversity analysis (Ni et al 2002 ; Ravi et al 2003 ; Caicedo et al 2007 ; Ram et al 2007 ).…”

<i>Oryza</i> Wild Species: An Alternative for Rice Breeding under Abiotic Stress Conditions

“…In Latin America, the genetic basis of rice is considered narrow, and genetic vulnerability occurs when an organism lacks genes or alleles to tolerate determined environmental or biological stress, which leads to crop vulnerability [64].…”

Is the genetic variability of elite rice in southern Brazil really disappearing?

“…more than 80% of all Brazilian rice (SOSBAI 2018). In fact, studies have reported evidence for the gradual narrowing of the genetic variability among the elite cultivars grown in southern Brazil (Rangel et al 1996, Raimondi et al 2014, Rabelo et al 2015, Streck et al 2018, Streck et al 2019. However, it is important to emphasize that these studies may have applied datasets and methods with somehow restricted efficiency to evaluate the genetic variability.…”