National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
In the present study, influence of cyto-nuclear interactions using Ogu CMS cytoplasm has been studied by comparing the estimates of GCA, SCA and manifestation of heterosis in euplasmic vis-à-vis in alloplasmic set of crosses. Experimental material consisted of 30 euplasmic hybrids generated by crossing 10 lines viz. PRL-2008-5, PBR-357, Maya, PRKS-28, Rohini, Sej-2, Vaibhav, EJ-22, PYR-2009-5 and PYR-2009-13 and three testers viz. IC-414317, IC-414322 and PR-2006-14. Besides, same set of lines converted into Ogu CMS background was used to develop 30 alloplasmic hybrids by crossing with three restorers (same set of testers carrying restorer gene). GCA status of parental lines in euplasmic and alloplasmic sets of crosses revealed that nicking ability of lines may or may not be influenced by the genetic and cytoplasmic background for different characters. The effect of cyto-nuclear interactions was clearly evidenced by higher frequency of crosses displaying desirable heterotic crosses in euplasmic set than in alloplasmic set for all the characters except plant height, seeds per siliqua and oil content. The effect was more pronounce for days to 50% flowering, siliquae on main raceme, primary branches, secondary branches and siliqua length for which crosses with desirable heterosis were very less in alloplasmic crosses. One cross i.e. Maya × PR-2006-14 did not show any directional change in heterosis over MP as well as BP. This revealed that combining ability and heterosis of parental lines with native cytoplasm may or may not remain intact after their conversion into CMS background. Thus, it can be inferred that assessment of combining ability and heterosis of lines converted into CMS background will have to be re-examined for identification of potential crosses for commercialization of CMS based hybrids. There also exists possibility of finding crosses with negligible or no effect of cyto-nuclear interactions due to re-establishment of harmonious interaction.
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