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Title : Coordinator's report 1997/98 National Wheat Research Program Material Type: printed text Authors: Ashok Mudwari, Author Pagination: p. 1-8 Languages : English (eng) Link for e-copy: http://elibrary.narc.gov.np/?r=2738 Coordinator's report 1997/98 National Wheat Research Program [printed text] / Ashok Mudwari, Author . - [s.d.] . - p. 1-8.
Languages : English (eng)
Link for e-copy: http://elibrary.narc.gov.np/?r=2738 Genetic Diversity in Nepalese Wheat Cultivars Based on Agro-Morphological Traits and Coefficients of Parentage / Joshi, Bal K. in Nepal Agriculture Research Journal, Vol. 5 (2004)
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
Title : Wheat Genetic Resources in Nepal Material Type: printed text Authors: Joshi, Bal K., Author ; Ashok Mudwari, Author ; Madan P. Bhatta, Author Publication Date: 2006 Article on page: 1-9 p. Languages : English (eng) Keywords: Ancestor, landrace, origin, wheat gene pool Abstract: Genetic diversity must be maintained and utilized for sustainable agriculture development. The
amount of genetic diversity in the country depends on the number and diversity of the original
ancestors involved in the creation of a germplasm pool, wild relatives and existing landraces.
The objective of this research was to study the diversity of wheat gene pool present in the
Nepalese bread wheat cultivars and landraces that could help for developing conservation and
utilization strategy effectively. We examined the pedigrees of 35 Nepalese wheat cultivars and
surveyed the literature for distribution of landraces and wild relatives of wheat. Cultivated
landraces of spring and winter type, wild landraces and diploid species of wheat are found in
Nepal. There are 35 improved wheat cultivars, 540 landraces and 10 wild relatives of wheat.
Crosses between winter and spring wheat gene pools are far more common and offer a new
source of diversity. Mexico, India and Nepal are the origin countries for 35 cultivars. In Nepal
four cultivars were bred and developed using foreign landraces and maximum number of
cultivars was developed in Mexico. Lerma 52, first improved cereal variety to be released in the
history of cereal breeding in Nepal was released in 1960. A total of 89 ancestors originated in 22
different countries were used to develop these cultivars. Highest number of ancestors was from
India. Ancestors of both aestivum and durum species having winter, spring and intermediate
growth habit indicated the collection of wide gene pool. Most of the ancestors were aestivum
(76.40%) and spring growth habit (57.31%). Modern varieties are replacing the landraces and
improved old varieties resulted in the genetic erosion. Therefore, in situ, on farm and ex situ
conservations are necessary for maintaining these genetic variations. Unutilization of local
landraces in breeding program may be the major factor that causes to accelerate the genetic
erosion. Gene pool from these landraces along with international gene pool could make towards
success in developing high yielding cultivars with wide adaptability. In this study, cultivars and
landraces surveyed represent a wide range of variation for different areas of origin and
adaptation.Link for e-copy: http://elibrary.narc.gov.np/?r=40
in Nepal Agriculture Research Journal > Vol. 7 (2006) . - 1-9 p.[article] Wheat Genetic Resources in Nepal [printed text] / Joshi, Bal K., Author ; Ashok Mudwari, Author ; Madan P. Bhatta, Author . - 2006 . - 1-9 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 7 (2006) . - 1-9 p.
Keywords: Ancestor, landrace, origin, wheat gene pool Abstract: Genetic diversity must be maintained and utilized for sustainable agriculture development. The
amount of genetic diversity in the country depends on the number and diversity of the original
ancestors involved in the creation of a germplasm pool, wild relatives and existing landraces.
The objective of this research was to study the diversity of wheat gene pool present in the
Nepalese bread wheat cultivars and landraces that could help for developing conservation and
utilization strategy effectively. We examined the pedigrees of 35 Nepalese wheat cultivars and
surveyed the literature for distribution of landraces and wild relatives of wheat. Cultivated
landraces of spring and winter type, wild landraces and diploid species of wheat are found in
Nepal. There are 35 improved wheat cultivars, 540 landraces and 10 wild relatives of wheat.
Crosses between winter and spring wheat gene pools are far more common and offer a new
source of diversity. Mexico, India and Nepal are the origin countries for 35 cultivars. In Nepal
four cultivars were bred and developed using foreign landraces and maximum number of
cultivars was developed in Mexico. Lerma 52, first improved cereal variety to be released in the
history of cereal breeding in Nepal was released in 1960. A total of 89 ancestors originated in 22
different countries were used to develop these cultivars. Highest number of ancestors was from
India. Ancestors of both aestivum and durum species having winter, spring and intermediate
growth habit indicated the collection of wide gene pool. Most of the ancestors were aestivum
(76.40%) and spring growth habit (57.31%). Modern varieties are replacing the landraces and
improved old varieties resulted in the genetic erosion. Therefore, in situ, on farm and ex situ
conservations are necessary for maintaining these genetic variations. Unutilization of local
landraces in breeding program may be the major factor that causes to accelerate the genetic
erosion. Gene pool from these landraces along with international gene pool could make towards
success in developing high yielding cultivars with wide adaptability. In this study, cultivars and
landraces surveyed represent a wide range of variation for different areas of origin and
adaptation.Link for e-copy: http://elibrary.narc.gov.np/?r=40
