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Articles by N. Puppala
Total Records ( 2 ) for N. Puppala
  N. Singkham , S. Jogloy , T. Kesmala , P. Swatsitang , P. Jaisil , N. Puppala and A. Patanothai
  Oleic acid in peanut oil increases shelf-life and kernel quality. Heritability for oleic acid is important for predicting selection progress. The aims of this study were to estimate the heritability of oleic acid content by parent-offspring regression and to determine the correlation among oil characters. The data were collected in the F2 and F3 generations derived from the crosses between two high-oleic peanuts (SunOleic 97R and Georgia-02C) and a low oleic peanut (KKU 1). The F2 populations were planted in the rainy season (2008) and the F3 populations derived from the F2 populations were planted in the dry season (2008/09) at Khon Kean University. Heritability estimates in narrow sense were intermediate to high for oleic and linoleic acids (0.63-0.72 and 0.57-0.72, respectively). Heritability estimates for % oil were low in all populations. Significant and negative correlation was observed between oleic and linoleic acids (r = -0.98). The high heritability for oleic acid in this study indicated that selection for high oleic acid in peanut was effective in the F2 generation.
  S. L. Dwivedi , N. Puppala , H. D. Upadhyaya , N. Manivannan and S. Singh
  Crop improvement and the dissection of complex genetic traits require germplasm diversity. A core collection is a gateway for the use of diverse accessions with beneficial traits in applied breeding programs. Valencia germplasm consisting of 630 peanut (Arachis hypogaea L. ssp. fastigiata var. fastigiata) accessions from the USDA collection and a check cultivar, New Mexico Valencia C, were evaluated for 26 descriptors in an augmented design for two seasons. The accessions were stratified by country of origin, and data on morphological and agronomic descriptors were used for clustering following Ward's method. About 10% or a minimum of one accession from each cluster and region were selected to develop core subset of 77 accessions. Comparison of means between the core subset and the entire collection indicated that the genetic variation available for these traits in the entire collection has been preserved in the core subset. The similarity in correlation coefficients in the entire collection and core subset suggests that this core subset has preserved most of the coadapted gene complexes controlling these associations. Peanut breeders engaged in improving the genetic potential of Valencia peanuts will find this core subset useful in cultivar development.
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