eprintid: 10163
rev_number: 10
eprint_status: archive
userid: 1305
dir: disk0/00/01/01/63
datestamp: 2017-08-30 10:48:23
lastmod: 2017-08-30 10:49:12
status_changed: 2017-08-30 10:48:23
type: article
metadata_visibility: show
creators_name: Mvuyekure, S M
creators_name: Sibiya, J
creators_name: Derera, J
creators_name: Nzungize, J
creators_name: Nkima, G
icrisatcreators_name: Nzungize, J
affiliation: African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal (Pietermaritzburg)
affiliation: Rwanda Agriculture Board (Kigali)
affiliation: ICRISAT (Bamako)
country: South Africa
country: Rwanda
country: Mali
title: Genetic analysis of mechanisms associated with inheritance of resistance to sheath rot of rice
ispublished: pub
subjects: G1
subjects: S2021
subjects: s2.13
divisions: CRPS1
full_text_status: public
keywords: Rice, genetic analysis, genetic mechanisms, breeding investigations, gene action controlling inheritance, rice production, breeding gains
note: The Alliance for Green Revolution in Africa (AGRA), African Center
for Crop Improvement (ACCI) and University of KwaZulu-Natal are
gratefully acknowledged for funding and supervising this study. Special
thanks go also to Rwanda Agriculture Board (RAB) for facilitating
this study in one way or another.
abstract: Understanding genetic mechanisms controlling inheritance of disease resistance traits is essential in breeding investigations targeting development of resistant genotypes. Using North Carolina design II, 32 F1 hybrids were generated by crossing eight susceptible to four resistant parents and submitted for field evaluation. The analysis of general and specific combining ability (GCA and SCA) indicated involvement of additive and non-additive gene action controlling inheritance of horizontal resistance to sheath rot of rice. High GCA/SCA ratio and high heritability estimates revealed additive effects and were more predominant than none additive ones. The level of dominance indicated dominant genes was more important than recessive genes. Estimates of GCA and SCA analysis suggested that crop improvement programmes should be directed towards selection of superior parents or good combiners, emphasizing on GCA. As far as source of resistance is concerned, most promising genotypes were Cyicaro, Yunertian and Yunkeng. The predominance of additive genetic effects together with the relevance of dominant genes suggested possibilities of improving the resistance by introgression of resistance genes through recurrent selection coupled with phenotypic selection.
date: 2017
date_type: published
publication: Plant Breeding
volume: 136
number: 4
publisher: Wiley
pagerange: 509-515
id_number: 10.1111/pbr.12492
refereed: TRUE
issn: 01799541
official_url: http://dx.doi.org/10.1111/pbr.12492
related_url_url: https://scholar.google.co.in/scholar?q=Genetic+analysis+of+mechanisms+associated+with+inheritance+of+resistance+to+sheath+rot+of+rice&btnG=&hl=en&as_sdt=0%2C5
related_url_type: pub
funders: The Alliance for Green Revolution in Africa (AGRA); African Center for Crop Improvement (ACCI); University of KwaZulu-Natal
citation:   Mvuyekure, S M and Sibiya, J and Derera, J and Nzungize, J and Nkima, G  (2017) Genetic analysis of mechanisms associated with inheritance of resistance to sheath rot of rice.  Plant Breeding, 136 (4).  pp. 509-515.  ISSN 01799541     
document_url: http://oar.icrisat.org/10163/1/pbr12492.pdf