Genetics of resistance to sterility mosaic disease in pigeonpea

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Doctoral Thesis / Dissertation from the year 1996 in the subject Agrarian Studies, Andhra University (Andhra Pradesh Agricultural University), course: Ph.D, language: English, abstract: Investigations on genetics of resistance to sterility mosaic (SM) disease in pigeonpea were carried out (1993-96) at ICRISAT Asia Center, Patancheru, India, to determine the inheritance of resistance for three different isolates of pigeonpea sterility mosaic pathogen and to study the combining ability of few resistant and tolerant lines.In this direction, available lines (resistant/tolerant) were screened against two isolates of the SM pathogen. Breakdown of resistance was noticed in several lines, against isolate 2 of the pathogen. However, few lines resistant and tolerant to both the isolates were identified.Inheritance of resistance and tolerance, in few of these lines was investigated. Screening was carried out in pots, using leaf-stapling technique for isolates 1 and 3 and infector-hedge, forisolate 2. Observations in F, and segregating generations indicated the recessive nature of resistance and role of two independent non-allelic genes for isolates 1 and 3. Resistance against these isolates appeared to be dependent on the presence of recessive alleles, at least at one of the loci. However, against isolate 2, resistance was observed recessive in some crosses and dominant in other crosses. Further, disease reaction for isolate 2, appeared to be governed by two independent non-allelic genes, with at least three multiple alleles, at one of the loci.Combining ability studies of the resistant, tolerant and susceptible lines, included in the inheritance studies, were carried out with line x tester mating design, involving two male steriles and eleven pollen parents. The analysis of variance revealed significant differences for parents, hybrids, parents vs. hybrids and males, for all characters studied. Pre-ponderance of non-additive gene action was recorded for yield and all yield component characters studied.ICP MS288 female was found to be a good combiner for early maturity, dwarf and compact growth habit while ICP MS3783 tolerant to isolate 1 of pigeonpea sterility mosaic pathogen and wilt disease was better combiner for seed yield, pods per plant, test weight, primary and secondary branches. Among the males, LRG 30 recorded high general combining ability, for seed yield and majority of yield components. The sterility mosaic resistant parents were however, poor combiners for yield and majority of the component characters.

Weniger Details

Born at Gudur of Nellore District in Andhra Pradesh of India on 16.06.1968 and recieved formal school and matriculation education at Hyderabad, Andhra Pradesh, India. Completed graduation, post-graduation and doctorate from Acharya N G Ranga Agricultural University of Andhra Pradesh, India from 1985-1996. Worked on comparision of breeding methods in sesame for Masters Research during 1989-1991 and Genetics of resistance to sterility mosaic disease in pigeonpea for doctoral research during 1992-1996. Carried out the Doctoral Research at International Institute of Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, India from 1993 to 1996 and has published several national and international publications in peer reviewed journals. Served as Research Associate in Sunflower and Sorghum Crop Improvement Programs for a short period at Hyderabad. Joined the Teaching and Research Faculty of Acharya N G Ranga Agricultural University, Hyderabad, Andhra Pradesh, India in 1998 as Assistant Professor and was involved in development of gallmidge resistant varieties in paddy and was responsible for the development and release of three gallmidge resistant varieties and two brown plant hopper resistant varieities in paddy for the state of Andhra Pradesh from 1998 to 2008. Had also worked extensively on hybrid rice and had brought out several publications including a manual and text book on hybrid rice during this period. Had worked on sugarcane crop improvement from 2008 to 2013 and has been associated with the development of several popular sugarcane varieities. Had also worked in extension and was closely associated with answering of queries of farmers on various agricultural problems. Was involved in teaching of Under-graduate and post-graduate students of Genetics and Plant Breeding Department from 2014 in addition to guiding of post-graduate students for their Master's Research and thesis work. Has 75 research publications in addition to several presentations in national and international symposiums/conferences along with several rice varieties and books, manuals et.c to his credit. Was also awarded ICRISAT Ph.D Thesis scholarship and the prestigious Council of Scientific and Industrial Research (CSIR) Research Associateship in addition to 20th Century Young Scientist Award during 2000 and Best Scientist Award during 2006.