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