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Genetic Base of Wheat Cultivars Recommended in Nepal / Umesh R. Rosyara in Nepal Agriculture Research Journal, Vol. 6 (2005)
[article]
Title : Genetic Base of Wheat Cultivars Recommended in Nepal Material Type: printed text Authors: Umesh R. Rosyara, Author ; Joshi, Bal K., Author Publication Date: 2005 Article on page: 1-9 p. Languages : English (eng) Keywords: Coefficient of parentage, diversity, Triticum aestivum, wheat breeding Abstract: Plant breeding success is dependent, in part, upon the genetic diversity found within genetic
resources. The genetic base of wheat (Triticum aestivum L.) cultivars recommended in Nepal is not
well characterized. Therefore this study was carried out to quantify the genetic base of Nepalese
wheat cultivars by coefficient of parentage (COP). Analysis of pedigree information was based on
International Wheat Information System of the International Center for Maize and Wheat
Improvement (CIMMYT), which consists of WCOP for calculation of COP and WPDEND for
generating Mendelgram with contribution of ancestors to the cultivar if fully expanded. One
hundred eighteen ancestors from 23 countries were identified in the pedigree of 24 recommended
Nepalese cultivars. Of these, 32 ancestors contributed at least 1% each to the genetic base of
Nepalese cultivars, with a total contribution of 79%. Ancestors originating from USA contributed
19.8% of the genes, India 11.2%, Japan 9.5%, Argentina 7.5%, Kenya 7.5% Australia 6.2%, Brazil
5.6%, Canada 5.5%, Italy 4.1% and remaining from other countries. At 30% similarity, 18 clusters
were formed with largest cluster of five members. None of Nepalese landraces were traced in the
pedigree of these cultivars. Relatively large amount of diversity in Nepalese cultivars exits based on
their genetic background although small number of cultivars is recommended for cultivation.Link for e-copy: http://elibrary.narc.gov.np/?r=55
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 1-9 p.[article] Genetic Base of Wheat Cultivars Recommended in Nepal [printed text] / Umesh R. Rosyara, Author ; Joshi, Bal K., Author . - 2005 . - 1-9 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 1-9 p.
Keywords: Coefficient of parentage, diversity, Triticum aestivum, wheat breeding Abstract: Plant breeding success is dependent, in part, upon the genetic diversity found within genetic
resources. The genetic base of wheat (Triticum aestivum L.) cultivars recommended in Nepal is not
well characterized. Therefore this study was carried out to quantify the genetic base of Nepalese
wheat cultivars by coefficient of parentage (COP). Analysis of pedigree information was based on
International Wheat Information System of the International Center for Maize and Wheat
Improvement (CIMMYT), which consists of WCOP for calculation of COP and WPDEND for
generating Mendelgram with contribution of ancestors to the cultivar if fully expanded. One
hundred eighteen ancestors from 23 countries were identified in the pedigree of 24 recommended
Nepalese cultivars. Of these, 32 ancestors contributed at least 1% each to the genetic base of
Nepalese cultivars, with a total contribution of 79%. Ancestors originating from USA contributed
19.8% of the genes, India 11.2%, Japan 9.5%, Argentina 7.5%, Kenya 7.5% Australia 6.2%, Brazil
5.6%, Canada 5.5%, Italy 4.1% and remaining from other countries. At 30% similarity, 18 clusters
were formed with largest cluster of five members. None of Nepalese landraces were traced in the
pedigree of these cultivars. Relatively large amount of diversity in Nepalese cultivars exits based on
their genetic background although small number of cultivars is recommended for cultivation.Link for e-copy: http://elibrary.narc.gov.np/?r=55 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)
[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 Pollen and Spikelet Analysis in F1 Rice Hybrids and their Parents / Joshi, Bal K. in Nepal Agriculture Research Journal, Vol. 8 (2007)
[article]
Title : Pollen and Spikelet Analysis in F1 Rice Hybrids and their Parents Material Type: printed text Authors: Joshi, Bal K., Author ; Laxmi P. Subedi, Author ; Santa B. Gurung, Author Publication Date: 2007 Article on page: 120-126 p General note: Research note Languages : English (eng) Keywords: Correlation, F1 rice, pollen category, regression coefficient Abstract: Pollen analysis can be used to discriminate between different species, identify possible
interspecies hybrids, identify restorer and maintainer lines, useful to study genetics of
restorer gene, interaction between chromosome and cytoplasm and relationship between
parents. Pollen abortion system of male sterility is an important tool in hybrid rice
production and spikelet is the major yield components. Nine improved cultivars, six
landraces and three wild aborted cytoplasmic-genetic male sterile (CMS) lines were used to
analyze pollen and spikelet in F1 rice hybrids and their parents. The frequency of pollen
categories and its relationship to spikelet fertility were investigated. Pollen sterility of the
F1s was determined by staining pollen grains in 1% potassium iodide-iodine (I-KI) solution.
Spikelet fertility was determined by counting the total number of seed set in proportion to
the total number of spikelets. Correlation and regression coefficients for some traits were
computed. In hybrids, pollen fertility ranged from 0.5 to 82% and spikelet fertility from 0 to
87%. Pollen fertility varied from 28 to 97%, while spikelet fertility from 73 to 91% in pollen
parents. The highest and the lowest percentages of pollen fertility were found in Chaite-6
and Chiunde cultivars respectively. Spikelet fertility percentage varied widely among
hybrids and many hybrids had lower spikelet fertility percentage than their parents.
Therefore, it is of practical importance to understand the causes of high spikelet sterility in
hybrids for possible increase in spikelet fertility. Highly significant positive correlation was
found between stained round fertile (SRF) pollen and spikelet fertility. The positive value of
correlation and regression coefficient on SRF and spikelet fertility were found between F1
and mid parent, and F1 and male parent. High fertility of cross may be due to the presence of
a wide compatibility gene or restorer genes in the cultivar. Lower pollen and spikelet
fertility of the crosses was attributed to effect of the genetic background of the tester parent.Link for e-copy: http://elibrary.narc.gov.np/?r=37
in Nepal Agriculture Research Journal > Vol. 8 (2007) . - 120-126 p[article] Pollen and Spikelet Analysis in F1 Rice Hybrids and their Parents [printed text] / Joshi, Bal K., Author ; Laxmi P. Subedi, Author ; Santa B. Gurung, Author . - 2007 . - 120-126 p.
Research note
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 8 (2007) . - 120-126 p
Keywords: Correlation, F1 rice, pollen category, regression coefficient Abstract: Pollen analysis can be used to discriminate between different species, identify possible
interspecies hybrids, identify restorer and maintainer lines, useful to study genetics of
restorer gene, interaction between chromosome and cytoplasm and relationship between
parents. Pollen abortion system of male sterility is an important tool in hybrid rice
production and spikelet is the major yield components. Nine improved cultivars, six
landraces and three wild aborted cytoplasmic-genetic male sterile (CMS) lines were used to
analyze pollen and spikelet in F1 rice hybrids and their parents. The frequency of pollen
categories and its relationship to spikelet fertility were investigated. Pollen sterility of the
F1s was determined by staining pollen grains in 1% potassium iodide-iodine (I-KI) solution.
Spikelet fertility was determined by counting the total number of seed set in proportion to
the total number of spikelets. Correlation and regression coefficients for some traits were
computed. In hybrids, pollen fertility ranged from 0.5 to 82% and spikelet fertility from 0 to
87%. Pollen fertility varied from 28 to 97%, while spikelet fertility from 73 to 91% in pollen
parents. The highest and the lowest percentages of pollen fertility were found in Chaite-6
and Chiunde cultivars respectively. Spikelet fertility percentage varied widely among
hybrids and many hybrids had lower spikelet fertility percentage than their parents.
Therefore, it is of practical importance to understand the causes of high spikelet sterility in
hybrids for possible increase in spikelet fertility. Highly significant positive correlation was
found between stained round fertile (SRF) pollen and spikelet fertility. The positive value of
correlation and regression coefficient on SRF and spikelet fertility were found between F1
and mid parent, and F1 and male parent. High fertility of cross may be due to the presence of
a wide compatibility gene or restorer genes in the cultivar. Lower pollen and spikelet
fertility of the crosses was attributed to effect of the genetic background of the tester parent.Link for e-copy: http://elibrary.narc.gov.np/?r=37 Modeling of soil organic matter content from world view-2 sensor in Nayavelhani VDC of Nawalparasi District, Nepal / Vaidya, S.N.
in Proceedings of the Second National Soil Fertility Research Workshop, 24-25 March, 2015. Soil Science Division, NARC, Khumaltar, Lalitpur, Nepal / Krishna B. Karki
Title : Modeling of soil organic matter content from world view-2 sensor in Nayavelhani VDC of Nawalparasi District, Nepal Material Type: printed text Authors: Vaidya, S.N., Author ; K Sah, Author Pagination: 403-411 p. Languages : English (eng) Keywords: Digital number, World View-2, coefficient of the estimator, correlation, soil organic matter content. Abstract: Soil organic matter (SOM) is one of the fundamental soil properties affecting productivity of crops by controlling nutrient budgets in agricultural production systems. Visual and qualitative interpretation of air-photos is still the base of mapping of SOM as most common method. Quantitative estimation of soil organic matter content (SOM) is essential when there is scanty of soil test laboratories, its strong spatial dependence and its measurement is a time and labor-consuming procedure and emerging geographical science information technology. In the present attempt, soil organic matter content is modeled by using airborne world view-2 reflective remote sensing methodology and it was tested in Nayavelhani (62.31 sq.km) VDC of Nawalparasi district of Nepal………………….
Link for e-copy: http://elibrary.narc.gov.np/?r=2244 Modeling of soil organic matter content from world view-2 sensor in Nayavelhani VDC of Nawalparasi District, Nepal [printed text] / Vaidya, S.N., Author ; K Sah, Author . - [s.d.] . - 403-411 p.
in Proceedings of the Second National Soil Fertility Research Workshop, 24-25 March, 2015. Soil Science Division, NARC, Khumaltar, Lalitpur, Nepal / Krishna B. Karki
Languages : English (eng)
Keywords: Digital number, World View-2, coefficient of the estimator, correlation, soil organic matter content. Abstract: Soil organic matter (SOM) is one of the fundamental soil properties affecting productivity of crops by controlling nutrient budgets in agricultural production systems. Visual and qualitative interpretation of air-photos is still the base of mapping of SOM as most common method. Quantitative estimation of soil organic matter content (SOM) is essential when there is scanty of soil test laboratories, its strong spatial dependence and its measurement is a time and labor-consuming procedure and emerging geographical science information technology. In the present attempt, soil organic matter content is modeled by using airborne world view-2 reflective remote sensing methodology and it was tested in Nayavelhani (62.31 sq.km) VDC of Nawalparasi district of Nepal………………….
Link for e-copy: http://elibrary.narc.gov.np/?r=2244 E-copies
http://nkcs.org.np/narc/dl/?r=2244URL Stability Analysis Of Grain Yield,Its Components And Quality Parameters Of Bread Wheat(Triticum Aestivum L.)Genotypes Under rainfed And Late Sown Conditions / R.B Yadav
Title : Stability Analysis Of Grain Yield,Its Components And Quality Parameters Of Bread Wheat(Triticum Aestivum L.)Genotypes Under rainfed And Late Sown Conditions Material Type: printed text Authors: R.B Yadav, Author Publisher: New Delhi : Indian Agricultural Research Institute Publication Date: 2003 Pagination: 112 p. Languages : English (eng) Keywords: wheat; grain yield and it's components; plant height; protein content; path coefficient analysis Link for e-copy: http://elibrary.narc.gov.np/?r=3230 Stability Analysis Of Grain Yield,Its Components And Quality Parameters Of Bread Wheat(Triticum Aestivum L.)Genotypes Under rainfed And Late Sown Conditions [printed text] / R.B Yadav, Author . - New Delhi : Indian Agricultural Research Institute, 2003 . - 112 p.
Languages : English (eng)
Keywords: wheat; grain yield and it's components; plant height; protein content; path coefficient analysis Link for e-copy: http://elibrary.narc.gov.np/?r=3230 Copies (1)
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