Gene Action and Heterosis for Yield and Associated Traits in Indica and Tropical Japonica Crosses of Rice (Oryza sativa L.) Involving Wide Compatibility Gene(s)

Heterosis Studies for Various Morphological Traits of Rice under Drought Conditions

“…None of the cross combination recorded significant heterosis for all the traits simultaneously. These results are in agreement with the findings of Alam et al, (2004); Rashid et al, (2007); Parihar and Pathak (2008); Neelam et al, (2009); Kumar et al, (2010); Najeeb et al, (2011) and Dwivedi and Pandey (2012). Most of the crosses which showed significant and positive heterosis for grain yield also showed significant and positive heterosis for most of the yield attributing characters.…”

“…These findings are in close agreement with the various workers who reported a standard heterosis of more than 20 per cent for grain yield increase over standard variety. Annadhurai and Nadarajan (2001), Janardhanam et al, (2001), , Datt and Mani (2004), Bhandarker et al, (2005), Malini et al, (2006), Eradasappa et al, (2007), Parihar and Pathak (2008), Venkatesan et al, (2008), Roy et al, (2009), Kumar et al, (2010), Tiwari et al, (2011) and Kumar et al,(2012), Dwivedi and Pandey, (2012).…”

Heterosis for Grain Yield and Its Component Traits in Rice

“…Significant negative heterosis were found in four hybrids over mid parent (IR58025A x Manupriya, IR58025A x Swarnaprabha, UPRI95-17A x Remya and IR58025A x Varsha), better parent (CRMS32A x Remya, CRMS32A x Kanakom, CRMS31A x Kanakom, IR58025A x Manupriya) and standard check (CRMS32A x Kanakom, IR58025A x Manupriya, CRMS31A x Kanakom, CRMS32A x Remya). Expression of significant negative heterosis for plant height was reported by Tiwary et al, (2011), Aditya Kumar et al, (2012) and Dwivedi and Pandey (2012).…”

Heterosis analysis in relation to drought tolerance in rice land races and their genotypes

“…Hence it is excel the hybrids excel the standard variety in many number aspects. Earlier workers Dwivedi and Pandey (2012) and Manonmani and Fazlullah Khan (2003) reported the presence of non-additive gene action for grain yield and most of the yield contributing and drought tolerant traits in the hybrids resulted in high amount of vigour in F1 indicating the possibility of augmenting yield and drought tolerance by exploiting heterosis. These hybrids may be utilized for future breeding program for development of drought tolerance lines.…”

“…About 45% of the world's rice is cultivated in rainfed ecosystems (IRRI, 2002). Drought is the most important source of climate-related risk for rice production in rainfed areas (Dwivedi and Pandey, 2012). The increasing threat from water shortage and drought in many rice-growing areas of Asia, particularly the rainfed areas, has posed a great challenge to rice breeders to develop drought tolerant and/or water-saving rice cultivars (Zhao et al, 2008).…”