Effects of Growth Duration on Grain Yield and Quality in Rice (Oryza sativa L.)

High-yielding rice cultivars with good processing quality and rich in nutrition suitable to a changing climate are of particular importance for future rice-based food production. Here, seven Rwandan rice cultivars were grown in a climate chamber of the biotron facility at the Swedish University of Agricultural Sciences, to be evaluated for their grain yield, nutritional composition, and dough mixing properties. Two different levels of inorganic fertilizer were applied weekly from the seedling stage until flowering. Significant differences for grain yield and quality attributes were found between cultivars. Jyambere showed significantly the highest yield while Ingwizabukungu, Nemeyubutaka, and Jyambere were high in mineral elements content. Ndamirabahinzi and Mpembuke had the highest levels of TPC and TAC. Generally, the lower fertilizer dose resulted in a better performance of the cultivars for both yield and quality attributes. Significantly higher content of Fe, Ca, and Ba was found in grains from the moderate fertilizer dose, whereas K, Na, P, S, Zn, Cd, and Pb increased in grains from the higher fertilizer dose. The cultivar Ndamirabahinzi showed less variability of evaluated characters across fertilizer doses. The results from this study may be used for rice breeding of cultivars with high yield and good grain quality.

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Genetic Variability And Character Associations In Irrigated Rice (Oryza Sativa L)

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v23i2.9321 ◽

1970 ◽

Vol 23 (2) ◽

pp. 23-28 ◽

Cited By ~ 3

Author(s):

S Ghosal ◽

PL Biswas ◽

M Khatun ◽

S Khatun

Keyword(s):

Oryza Sativa ◽

Genetic Variability ◽

Grain Yield ◽

Oryza Sativa L ◽

Grain Weight ◽

Path Coefficient ◽

Genetic Advance ◽

Thousand Grain Weight ◽

Growth Duration ◽

Irrigated Rice

Eighteen advanced breeding lines were evaluated for yield and yield contributing characters to observe their variability, associations and direct and indirect effect on yield during Boro season, 2009. All the tested characters showed significant variation. Effective tillers/m2 and spikelet sterility (%) had high genotypic variance, high heritability, high genetic advance and high genotypic coefficient of variation. Effective tillers/m2, panicle length (cm), thousand grain weight (g) and growth duration (days) showed significant positive association with grain yield. Path coefficient analysis also revealed that effective tillers/m2, thousand grain weight (g) and growth duration (days) had higher direct effects on yield (t/ha). All together with the genetic variability, correlation and path analysis revealed that effective tillers/m2, thousand grain weight (g) and growth duration (days) are the most important yield components in rice. Therefore, from the present study it could be suggested that emphasize should be given on these characters for the selection of genotypes for higher grain yield in irrigated rice. Keywords: Rice (Oryza sativa L.); GCV; PCV; heritability; genetic advance; correlationDOI: http://dx.doi.org/10.3329/bjpbg.v23i2.9321 Bangladesh J. Pl. Breed. Genet., 23(2): 23-27, 2010

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Studies on Genetic Variability of Grain Yield and Quality in F2 and F3 Generations of Aromatic Rice (Oryza sativa L.)

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2020/v39i1030631 ◽

2020 ◽

pp. 86-91

Author(s):

L. Krishna ◽

Y. Chandra Mohan ◽

C. H. Surender Raju ◽

D. Bhadru

Keyword(s):

Grain Yield ◽

Oryza Sativa L ◽

Selection Response ◽

Yield And Quality ◽

Head Rice ◽

High Heritability ◽

High Selection ◽

Grain Yield And Quality ◽

F2 Generation ◽

1000 Grain Weight

The present investigation was carried out for yield and quality related traits in the F2 and F3 populations of twenty eight rice cross combinations developed from five aromatic (Pusa 1121, Improved Pusa Basmati, Basmati 370, Sumathi and RNR 2354) and three non-aromatic (BPT 5204, Akshyadhan and NLR 145) parents. In F2 generation, among the yield characters, the highest values of phenotypic co-efficient of variation (PCV) and genotypic co-efficient of variation (GCV) were recorded for the number of filled grains/panicle followed by grain yield per plant while the lowest values were recorded for days to 50% flowering. However, for the grain quality characters the highest PCV and GCV values were recorded for head rice recovery and lowest for kernel breadth. In F3 population, higher magnitudes of PCV and GCV were recorded for the number of filled grains/panicle and panicle weight, indicating greater scope of obtaining high selection response for these traits. High heritability in narrow sense along with medium to high genetic advance was noticed for the traits like days to 50% flowering, 1000 grain weight and the kernel traits.

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