International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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Original Research Articles                      Volume : 7, Issue:6, June, 2018

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : /
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(6): 3621-3628

Studies on Frequency Distribution of Sorghum Downy Mildew Resistant BC2F1 Progenies in Maize
K. Sumathi1*, K. N. Ganesan2 and N. Senthil3
1Centre for Plant breeding and Genetics, TNAU Coimbatore, India
2Millet Breeding Station, TNAU Coimbatore, India
3Centre for Plant Molecular Biology, TNAU Coimbatore, India
*Corresponding author

The objective of this study was to investigate the distribution of progressive selection generations in order to define the maximum efficiency of increasing yield in relation to the stage of selection procedure. The present investigation was carried out at Eastern Block of the Central Farm Unit, Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India to identify the gene interaction for yield contributing characters to increase the yield. For this purpose twelve biometrical characters of five SDM resistant progenies viz., UMI 79/936-C1-3, UMI 79/936-C1-7 UMI 79/936-C1-29, UMI 79/936-C1-67 and UMI 79/936-C1-101 were used for frequency distribution studies. These studies revealed that negative skewness was observed in most of the BC2F1 progenies for days to 50% tasseling, days to 50% silking, days to maturity, plant height, ear height, cob length, cob diameter, number of rows per cob, number of grains per row, and shelling %. Therefore for these characters the presence of duplicate epistasis gene action was confirmed and the gain is faster with mild selection and rapid with intense selection. In the case of progenies viz., UMI 79/936-C1-3, UMI 79/936- C1-29 and UMI 79/936- C1-67 showed positive skewness for cob weight, 100 grain weight and grain yield per plant. The progeny UMI 79/936-C1-7 showed positive skewness for almost all the characters under study. Therefore these characters were governed by complementary gene action. The gain is slower with mild selection but is faster with intensive selection.

Keywords: Frequency distribution, Skewness, Kurtosis, Maize

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Sumathi, K., K. N. Ganesan and Senthil, N. 2018. Studies on Frequency Distribution of Sorghum Downy Mildew Resistant BC2F1 Progenies in Maize.Int.J.Curr.Microbiol.App.Sci. 7(6): 3621-3628. doi:
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