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Heterosis for Yield and Yield Components in Rice / Joshi, Bal K. in Nepal Agriculture Research Journal, Vol. 4 (2000/2001)
[article]
Title : Heterosis for Yield and Yield Components in Rice Material Type: printed text Authors: Joshi, Bal K., Author Publication Date: 2000 Article on page: 6-13 p. Languages : English (eng) Keywords: F1, heterobeltiosis, hybrid vigor, Oryza sativa, standard heterosis Abstract: It is important to know the degree and direction of hybrid vigor for its commercial exploitation.
Heterobeltiosis and standard heterosis were studied in 14 crosses between rice (Oryza sativa L.)
cultivars (improved and landraces) and three wild aborted male sterile parents. These crosses
showed marked variations in the expression of heterobeltiosis and standard heterosis for yield and
yield components. Grain yield manifested highly significant heterobeltiosis and standard heterosis
in five crosses. Heterobeltiosis ranging from –55 to 139% and standard heterosis from –11 to
369% were observed. Highest heterotic effect among the yield components was for panicle
number plant-1 followed by spikelet number and panicle length. With appropriate choice of
parental lines, it is possible to develop F1 rice hybrid possessing distinct yield superiority over the
best-inbred lines.Link for e-copy: http://elibrary.narc.gov.np/?r=86
in Nepal Agriculture Research Journal > Vol. 4 (2000/2001) . - 6-13 p.[article] Heterosis for Yield and Yield Components in Rice [printed text] / Joshi, Bal K., Author . - 2000 . - 6-13 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 4 (2000/2001) . - 6-13 p.
Keywords: F1, heterobeltiosis, hybrid vigor, Oryza sativa, standard heterosis Abstract: It is important to know the degree and direction of hybrid vigor for its commercial exploitation.
Heterobeltiosis and standard heterosis were studied in 14 crosses between rice (Oryza sativa L.)
cultivars (improved and landraces) and three wild aborted male sterile parents. These crosses
showed marked variations in the expression of heterobeltiosis and standard heterosis for yield and
yield components. Grain yield manifested highly significant heterobeltiosis and standard heterosis
in five crosses. Heterobeltiosis ranging from –55 to 139% and standard heterosis from –11 to
369% were observed. Highest heterotic effect among the yield components was for panicle
number plant-1 followed by spikelet number and panicle length. With appropriate choice of
parental lines, it is possible to develop F1 rice hybrid possessing distinct yield superiority over the
best-inbred lines.Link for e-copy: http://elibrary.narc.gov.np/?r=86 Evaluation of Common Nepalese Rice Cultivars Against Rice Root Knot Nematode / Deepak Sharma Paudyal in Nepal Agriculture Research Journal, Vol. 5 (2004)
[article]
Title : Evaluation of Common Nepalese Rice Cultivars Against Rice Root Knot Nematode Material Type: printed text Authors: Deepak Sharma Paudyal, Author ; Ramesh R. Pokharel, Author ; Sundar M. Shrestha, Author ; G.B. Khatri Chhetri, Author Publication Date: 2004 Article on page: 33-36 p Languages : English (eng) Keywords: Meloidogyne graminicola, Oryza sativa, resistant sources Abstract: Twelve commonly cultivated rice cultivars viz. Radha-7, Ghaiya-2, Rampur Masuli,
Bindeshwari, Makawanpur-1, Sabitri, Janaki, Chaite-2, Radha-9, Radha-4, Chaite-6 and Masuli were
tested against rice root knot nematode (Meloidogyne graminicola) in sick soil under greenhouse
condition. Resistance screening of the cultivars was done based on the
reproducibility of M. graminicola to IR-29 susceptible check and disease intensity grade was
classified on the basis of root knot index. All the cultivars were susceptible to M. graminicola
except Masuli and Chaite-6, which were moderately resistant. Ghaiya-2 and Janaki were even more
susceptible than IR-29 and these cultivars can be used as susceptible check instead of IR-
29. Since the common cultivars were susceptible to M. graminicola, it is necessary to screen more
rice cultivars to explore resistant sources against root knot nematode of rice.Link for e-copy: http://elibrary.narc.gov.np/?r=76
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 33-36 p[article] Evaluation of Common Nepalese Rice Cultivars Against Rice Root Knot Nematode [printed text] / Deepak Sharma Paudyal, Author ; Ramesh R. Pokharel, Author ; Sundar M. Shrestha, Author ; G.B. Khatri Chhetri, Author . - 2004 . - 33-36 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 33-36 p
Keywords: Meloidogyne graminicola, Oryza sativa, resistant sources Abstract: Twelve commonly cultivated rice cultivars viz. Radha-7, Ghaiya-2, Rampur Masuli,
Bindeshwari, Makawanpur-1, Sabitri, Janaki, Chaite-2, Radha-9, Radha-4, Chaite-6 and Masuli were
tested against rice root knot nematode (Meloidogyne graminicola) in sick soil under greenhouse
condition. Resistance screening of the cultivars was done based on the
reproducibility of M. graminicola to IR-29 susceptible check and disease intensity grade was
classified on the basis of root knot index. All the cultivars were susceptible to M. graminicola
except Masuli and Chaite-6, which were moderately resistant. Ghaiya-2 and Janaki were even more
susceptible than IR-29 and these cultivars can be used as susceptible check instead of IR-
29. Since the common cultivars were susceptible to M. graminicola, it is necessary to screen more
rice cultivars to explore resistant sources against root knot nematode of rice.Link for e-copy: http://elibrary.narc.gov.np/?r=76