Genetic Analysis of Different Amylose Levels in Rice<sup>1</sup>

Kumar, Ish; Khush, G. S.

doi:10.2135/cropsci1987.0011183x002700060016x

Cited by 46 publications

(28 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is directly associated with volume expansion and water absorption during cooking and with hardness, whiteness and dullness of cooked rice. Genetic studies have indicated that the nonwaxy trait dominates over the waxy trait (Kumar and Khush, 1987). Among nonwaxy parents, high amylose is completely dominant over low or intermediate amylose, and intermediate is dominant over low (Kumar and Khush, 1987).…”

Section: Discussionmentioning

confidence: 99%

“…Genetic studies have indicated that the nonwaxy trait dominates over the waxy trait (Kumar and Khush, 1987). Among nonwaxy parents, high amylose is completely dominant over low or intermediate amylose, and intermediate is dominant over low (Kumar and Khush, 1987). The statistical results pertaining to amylose content of different rice variants are presented in Table 2.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Identification of introgressed alien chromosome segments associated with grain quality in Oryza rufipogon x MR219 advanced breeding lines using SSR markers

Fasahat

Muhammad

Abdullah³

et al. 2012

Genet. Mol. Res.

View full text Add to dashboard Cite

ABSTRACT. A limited backcross procedure was utilized to introgress genes associated with grain quality traits from Oryza rufipogon (Accession No. IRGC 105491), a wild rice from Malaysia, to the cultivated rice O. sativa cv. MR219, a popular high yielding Malaysian rice cultivar. A set of 10 BC 2 F 7 progenies were selected based on the field performance and phenotypic appearance in BC 2 F 5 and BC 2 F 6 generations, which initially started with 266 progenies in the BC 2 F 2 generation. These 10 advanced breeding lines are similar to each other but differ in several important grain quality traits, which can be traced to O. rufipogon introgressions. Phenotyping and genotyping of BC 2 F 7 variants were considered for QTL analysis. The introgressed lines did not show any significant changes compared to the recurrent parent MR219 for the traits grain density and milled rice percentage. All 10 progenies showed significantly higher head rice percentages (70-88%) than the recurrent parent ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 11 (3): 3534-3546 (2012) Introgression segments in advanced breeding lines 3535 MR219. Variants G13 and G15 had higher amylose contents than MR219. All variants were analyzed using polymorphic SSR markers. Of the 34 SSR markers, only 18 showed introgression from O. rufipogon for chromosomes 1, 2, 3, 5, 6, 8, 10, and 11. Graphical genotypes were prepared for each variant, and association between the introgression regions and the traits that increased grain quality was visualized. Based on marker trait association, some of the QTLs are stable across environments and genetic backgrounds and could be used universally.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Identification of introgressed alien chromosome segments associated with grain quality in Oryza rufipogon x MR219 advanced breeding lines using SSR markers

Fasahat

Muhammad

Abdullah³

et al. 2012

Genet. Mol. Res.

View full text Add to dashboard Cite

show abstract

“…It is known to vary from virtually 0 to about 30 per cent in the cultivars around the world. Unlike other cereals, people of various regions prefer to eat certain types of rice (Kumar & Khush, 1987). This obviously means that precise levels of amylose have to be bred into new varieties to satisfy local preferences.…”

Section: Introductionmentioning

confidence: 99%

Genetical control of amylose content in selected crosses of indica rice

1993

Self Cite

View full text Add to dashboard Cite

Models of Pooni et al. (1992) were employed to investigate the genetic control of amylose content in 10 rice crosses produced by the pairwise crossing of five varieties representing almost the whole range of amylose levels from 0 to 28 per cent. Analyses of the first-degree statistics revealed an important role of the additive and the dominance effects in determining the genetic variability in all the crosses. Epistasis and cytoplasmic effects were also observed to contribute significantly to the variability among the generation means of most crosses. Dominance was generally towards the higher score and its effects were enhanced by a complementary dominance x dominance interaction in several sets of basic generations.The predominantly additive nature of the genetic variability was further revealed by the analyses of second-degree statistics. Component D was detected significant in all the crosses while components H1 and H2 were non-significant throughout. Significance of the covariance components F' and F", however, showed indirectly that dominance contributed significantly to variability at the variance level. Higher levels of transgression and considerable increases in the phenotypic ranges displayed by the segregating generations of various crosses, also pointed to their potency for yielding superior recombinants with diverse levels of amylose.

show abstract

“…The range of amylose contents for the waxy varieties measured in Table 2 fell within the very low amylose class (Kumar & Khush, 1987). Based on these results, it is easy to conclude that waxy rice grains do have some amount of amylose molecules despite the absence of GBSSI expression within the grains of these varieties.…”

Section: The Molecules Of Amylosementioning

confidence: 68%

“…It is measured in breeding programs as soon as heterozygosity is minimised and is the first tool used in the selection process for eating quality. Rice varieties are classified into high (>25%), intermediate (20 -25%), low (10 -19%), very low (3 -9%), or waxy (0 -2%) amylose classes (Kumar & Khush, 1987).…”

Section: Amylose Contentmentioning

confidence: 99%