Selection and evaluation of pigeonpea (cajanu5 cajan (l) millsp.) genotypes for resistance to fusariuh wilt pathogen (fusariuh oxysporuh f.sp. udum) and other agronomic traits.
Abstract
Fusarium wilt caused by Fusarium udum Butler has
been identified as an important factor in YIeld
reduction of pigeonpea in maJor growing areas of Kenya.
Studies to develop varieties resistant to the Fusarium
wilt were initiated in 1983 by the University of Nairobi
pIgeonpea improvement programme using crosses between
susceptible and resistant varieties from both local and
exotic germplasm selections, while maintaining desirable
agronomic traits. Disease screening was initiated at the
Makueni sick plot and finally at both the Makueni and
Katumani sick plots and in the glass house (Kabete)
during the 1989/90 and 1990/91 seasons.
Objectives were to compare glass house and field
screening and to select genotypes from the initial
crosses that were high yielding, early maturing and
resistant/tolerant to Fusarium wilt. Selection was done
in each season since 1983 on the populations derived
from the crosses. 1989 season, 111 lines had been
selected to constitute a population. Ten (10) lines that
were resistant/tolerant to the disease and that were
also early maturing, short in height and high yielding
were finally selected in the 1990/91 season. The
selection intensity in the 1990 season at Katumani and
Makueni sick plots was 23.7% and 21.0% respectively,
with a selection response of 4.2 and 8.3 for percent
wilt mortality.
Results also showed a high and significant
correlation coefficient (r = 0.79) between the glass
house and Makueni field ratings and a low and non
significant correlation coefficient (r 0.22) between
the glass house and Katumani field ratings implying that
glass house reaction indicates field disease reaction as
long as the strain being used is similar in both cases.
A high significant correlation coefficient (r = 0.77)
was observed between the the field sick plots and a
significant correlation coefficient (r = 0.57) between
the Qlasshouse and field wilt mean ratings at both
locations.
Citation
Nyende,A.B(1991). Selection and evaluation of pigeonpea (cajanu5 cajan (l) millsp.) genotypes for resistance to fusariuh wilt pathogen (fusariuh oxysporuh f.sp. udum) and other agronomic traits.Sponsorhip
University of NairobiPublisher
Department of Plant Science and Crop Protection, University of Nairobi
Subject
pigeonpea (cajanus cajan (l) millsp.)Fusariuh wilt pathogen (fusariuh oxysporuh f.sp. udum)
Agronomic traits.
Description
Msc- Thesis