Genetic components and Vr–Wr graphical analysis using a diallel set of crosses involved biotic stress tolerance parents in rice

Gunasekaran, Karthika; Rajeswari, S.; Govintharaj, Ponnaiah; Robin, S.

doi:10.1007/s42535-020-00122-9

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…For the additive-dominant effect, the characters CA, WC, WHO, and BG were significant (Table 3). It is noteworthy that, for all results of allelic and epistatic interactions, the characters CL, CW, and WHO were in agreement with the results that El-Abd et al (2008), Hassan et al (2011), Sultan et al (2014, Gunasekaran et al (2020), andLingaiah et al (2020) previously reported. They stated that the additive gene effect (a) is important for grain quality characters; it is the only parameter that shows significance for all variables analyzed in both crosses and influences the genetic control of characters related to the attributes of rice grain quality (CA, WC, VW, CL, CW, CL/CW, WHO, and BG).…”

Section: Gene Action Complete Modelsupporting

confidence: 92%

Gene action and genetic parameters of characters related to rice grain quality

Facchinello¹,

Carvalho

Streck

et al. 2021

Agronomy Journal

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Information about gene action, heritability, heredity, and potential gain estimated by selecting these characters is scarce. This study aims to estimate genetic parameters related to physical attributes of rice (Oryza sativa L.) grain quality. The crosses “BR/IRGA 409″ × “BRS Bojuru” and their reciprocal were performed, obtaining F1 and F2 generations and backcrosses (BC1 and BC2). After obtaining seeds, the experiment was conducted following a completely randomized design with replications determined by the total number of plants of each generation. Total chalky area (CA), white core (WC), vitreous whiteness (VW), caryopsis length (CL), caryopsis width (CW), caryopsis length × width (CL/CW), percentage of whole grains (WHO), and broken grains (BG) were evaluated. The experiment analyzed means and variances and genetic parameters of generations based on a complete model and additive‐dominant model. The physical attributes are inherited quantitatively, and the main genetic effect is the additive. However, there is a great environmental influence on the characters studied. The BR/IRGA 409 × BRS Bojuru cross makes it possible to obtain a greater genetic gain in the selection of chalky grain characters (CA, WC, and VW) as they express a narrower heritability, whereas BRS Bojuru × BR/IRGA 409 makes it possible to obtain a greater genetic gain in the selection of CL, CW, CL/CW, WHO, and BG. Parent plants affect the type of gene action. A gene action of partial dominance, overdominance, and complete dominance occurred among the physical attributes of grain quality.

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Section: Gene Action Complete Modelsupporting

confidence: 92%

Gene action and genetic parameters of characters related to rice grain quality

Facchinello¹,

Carvalho

Streck

et al. 2021

Agronomy Journal

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“…The traits with more additive components can be fixed in the early generation. The previous studies made by Bassuony and Zsembeli (2021) and Gunasekaran et al (2020) supported the results on the role of both additive and non-additive genetic components essential for determining the number of filled grains per panicle.…”

Section: Resultssupporting

confidence: 68%

“…Hayman's diallel analysis provides all the valuable genetic information viz., additive and dominance variances, over dominance effect, the proportion of dominant and recessive alleles in parents, group of genes governing a trait, heritability and presents graphical visualization using variance-covariance (Vr-Wr) graph. Hayman's diallel analysis was previously applied for yield related traits (Satheeshkumar et al, 2021), flag leaf characters (Bassuony and Zsembeli, 2021), biotic stress tolerance (Gunasekaran et al, 2020), rice quality parameters (Bano and Singh, 2019;Hasanalideh et al, 2019) and salinity tolerance (Souleymane et al, 2017) in rice. Grain number per panicle and other panicle and yield related traits need more valuation using Hayman's diallel approach for understanding about the influence of various genetic parameters which will in turn increase the grain yield.…”

Section: Introductionmentioning

confidence: 99%

Assessment of genetic components and heterotic potential for panicle and yield related traits in rice (Oryza sativa L.)

2022

EJPB

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Rice (Oryza sativa L.) is the staple food crop and it is cultivated under diverse ecological conditions. Understanding genetic effects and identifying superior hybrids are important steps in rice breeding to enhance yield. Six parents with varying numbers of grains per panicle were subjected to full diallel mating. Hayman's graphical approach was applied to compute various genetic parameters and better parental, mid parental and standard heterosis for panicle and yield related traits. The results revealed that, grain yield per plant and panicle related traits were governed by both additive and non-additive effects but the additive component was predominant for the number of filled grains per panicle and non-additive for grain yield per plant. The number of spikelets per panicle, the number of filled grains per panicle and the number of primary branches per panicle were mainly governed by recessive alleles present in the parents. The overdominance effect was found in the number of productive tillers, flag leaf area, panicle length, the number of primary branches per panicle, length of primary branches, thousand grain weight and grain yield per plant. The Vr-Wr graph depicted that the number of spikelets per panicle, the number of filled grains per panicle and the number of secondary branches per panicle were governed by partial dominance and grain yield per plant had over dominance effect and the low grain number parents, IET 28835 and ADT (R) 48 possessed more number of dominant alleles than other parents for all these traits. The promising cross combination BPT 5204 × CB12132 and its reciprocal hybrid exhibited high mid parental and standard heterosis for important panicle traits were adjudged as promising hybrids.

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“…Moreover, the degree of dominance scores was greater than unity (>1), indicating that all of the characters were dominant. As shown in the studies, dominant gene action was identified for days to 50% flowering, effective tillers plant -1 , and biological yield (Verma and Srivastawa, 2004), panicle length and 1000grain weight (Li et al, 2010), plant height (Mirarab andAhmadikhah, 2010), maturity period, effective tillers plant -1 , panicle length, spikelet fertility, and test weight (Gramaje et al, 2020) and days to 50% flowering, 1000-grain weight, effective tillers plant -1 and panicle length (Gunasekaran et al, 2020). Ganapati et al (2020) also reported dominant effects for the plant height, filled grain panicle -1 , grains panicle -1 and yield hill -1 , yield tiller -1 , and 1000grain weight.…”

Section: Estimation Of Genetic Componentsmentioning

confidence: 99%

Combining Ability and Heterotic Studies in Aromatic Rice Through Line by Tester Analysis

ISLAM¹,

GALIB²,

AKAND³

et al. 2022

SABRAOJBG

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Estimating combining ability helps to evaluate genotypes and determine the nature and degree of gene activities. This study aimed to identify the best parental genotypes and superior hybrids of aromatic rice using a line × tester mating design. Five CMS (cytoplasmic male sterility) lines and four testers of local and exotic origins of aromatic rice were studied in this experiment. The unweighted pair group method with arithmetic mean (UPGMA) cluster analysis revealed genetic variability among the studied CMS and restorer lines. The analysis of variance showed that parental lines, testers, and their line by testers populations had enough genetic variability. Five out of 20 hybrids found positive heterosis for grain yield, and the hybrid BRRI1A × BUdhan2R had the maximum heterosis. In terms of the agronomic traits evaluated, specific combining ability (SCA) effects were higher than general combining ability (GCA) effects. Genotypes IR58025A, BRRI1A, and BUdhan2R were identified as superior parents based on their performances for yield traits and GCA effects in the desired direction. IR58025A × BUdhan2R and BRRI1A × BUdhan2R were chosen as promising genotypes due to their highest grain yield, heterosis, and desirable SCA. Low ratios of σ2gca/σ2sca and (σ2D/σ2A)1/2, and low to high estimations of narrow-sense heritability indicated that both additive and non-additive gene effects predominated in the inheritance of the studied traits. Pearson's correlation showed that among the 10 studied traits, grain yield plant-1 was highly significant and positively correlated with flag leaf area, spikelet fertility (%), and filled grains panicle-1, as well as, significant and negatively correlated with days to flowering and days to maturity. Superior parental genotypes and hybrids that have been identified can be employed as donor parents to improve the grain yield in aromatic rice.

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Genetic components and Vr–Wr graphical analysis using a diallel set of crosses involved biotic stress tolerance parents in rice

Cited by 6 publications

References 6 publications

Gene action and genetic parameters of characters related to rice grain quality

Gene action and genetic parameters of characters related to rice grain quality

Assessment of genetic components and heterotic potential for panicle and yield related traits in rice (Oryza sativa L.)

Combining Ability and Heterotic Studies in Aromatic Rice Through Line by Tester Analysis

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