[article] 
inNepal Agriculture Research Journal > Vol. 5 (2004) . - 7-17 p

Title :	Genetic Diversity in Nepalese Wheat Cultivars Based on Agro-Morphological Traits and Coefficients of Parentage
Material Type:	printed text
Authors:	Joshi, Bal K., Author ; Ashok Mudwari, Author ; Bhatta, M.R., Author
Publication Date:	2004
Article on page:	7-17 p
Languages :	English (eng)
Keywords:	Agromorphological  traits,  coefficient  of  parentage,  genetic  diversity,  Nepalese  wheat  cultivars
Abstract:	Genetic diversity between parents is necessary to derive transgenic segregants from a cross. Coefficient of parentage (COP) and agromorphological traits (AMT) can be used to estimate diversity among cultivars. The pedigrees of 26 bread wheat cultivars were traced back to 77 ancestors and computed coefficient of parentage for all pair-wise combinations. All the cultivars used in the pedigree analysis were evaluated for six agromorphological traits in the National Wheat Research Programme (NWRP), Bhairahawa, Nepal in 1996. Six quantitative variables were used to compute dissimilarity distance matrix. Cluster and principal components analyses were performed on the matrix of COP and AMT values. COP matrix and the matrix based on agromorphological traits were compared. Mexico, India and Nepal were countries of the origin for 26 cultivars. A total of 77 ancestors originated from 22 different countries were used to develop these cultivars. Most of the ancestors were aestivum (80.52%) and spring growth habit (64.94%). Maximum dissimilarity was between RR 21 and Annapurna 3 and the most closely related pair was Rohini and BL 1022 based on the AMT. The mean of COP for all cultivars was 0.159 0.256. The highest COP was between Annapurna 3 and Annapurna 2. Other more closely related pairs based on COP were Kalyansona and Annapurna 2, Pasang Lhamu and Annapurna 3, UP 262 and RR 21, Vaskar and Kalyansona, NL 297 and BL 1473, Pasang Lhamu and Annapurna 1. Completely unrelated pairs were L 52 and HD 1982, L 52 and Kalyansona, LR 64 and Kalyansona, Kalyansona and HD 1982, PI and Kalyansona, PI and L 52, RR 21 and HD 1982, RR 21 and Kalyansona, RR 21 and PI. Fifteen ancestors were present in at least about 65% of the cultivars. 17 ancestors had been used more frequently. Five and six clusters were formed based on AMT and COP, respectively. Correlation coefficient between COP and AMT was 0.18 (P = 0.0168). Cultivars surveyed represent a wide range of variation for different areas of origin and adaptation. This genetic variation may be useful for further improvement of wheat and it is necessary to conserve them.
Link for e-copy:	http://elibrary.narc.gov.np/?r=72

[article] Genetic Diversity in Nepalese Wheat Cultivars Based on Agro-Morphological Traits and Coefficients of Parentage [printed text] / Joshi, Bal K., Author ; Ashok Mudwari, Author ; Bhatta, M.R., Author . - 2004 . - 7-17 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 7-17 p

Keywords:	Agromorphological  traits,  coefficient  of  parentage,  genetic  diversity,  Nepalese  wheat  cultivars
Abstract:	Genetic diversity between parents is necessary to derive transgenic segregants from a cross. Coefficient of parentage (COP) and agromorphological traits (AMT) can be used to estimate diversity among cultivars. The pedigrees of 26 bread wheat cultivars were traced back to 77 ancestors and computed coefficient of parentage for all pair-wise combinations. All the cultivars used in the pedigree analysis were evaluated for six agromorphological traits in the National Wheat Research Programme (NWRP), Bhairahawa, Nepal in 1996. Six quantitative variables were used to compute dissimilarity distance matrix. Cluster and principal components analyses were performed on the matrix of COP and AMT values. COP matrix and the matrix based on agromorphological traits were compared. Mexico, India and Nepal were countries of the origin for 26 cultivars. A total of 77 ancestors originated from 22 different countries were used to develop these cultivars. Most of the ancestors were aestivum (80.52%) and spring growth habit (64.94%). Maximum dissimilarity was between RR 21 and Annapurna 3 and the most closely related pair was Rohini and BL 1022 based on the AMT. The mean of COP for all cultivars was 0.159 0.256. The highest COP was between Annapurna 3 and Annapurna 2. Other more closely related pairs based on COP were Kalyansona and Annapurna 2, Pasang Lhamu and Annapurna 3, UP 262 and RR 21, Vaskar and Kalyansona, NL 297 and BL 1473, Pasang Lhamu and Annapurna 1. Completely unrelated pairs were L 52 and HD 1982, L 52 and Kalyansona, LR 64 and Kalyansona, Kalyansona and HD 1982, PI and Kalyansona, PI and L 52, RR 21 and HD 1982, RR 21 and Kalyansona, RR 21 and PI. Fifteen ancestors were present in at least about 65% of the cultivars. 17 ancestors had been used more frequently. Five and six clusters were formed based on AMT and COP, respectively. Correlation coefficient between COP and AMT was 0.18 (P = 0.0168). Cultivars surveyed represent a wide range of variation for different areas of origin and adaptation. This genetic variation may be useful for further improvement of wheat and it is necessary to conserve them.
Link for e-copy:	http://elibrary.narc.gov.np/?r=72