Final version of Tropical Legumes II Project Report for Phase 1 - icrisat

Mozambique
Table 5-9a: Quantities (kg) of good quality cowpea seed produced at three locations in Mozambique in 2010
Genotype
Location
Nampula Namialo Sussundenga Total
IT-18 700 520 650 1,870
IT00K-126-3 500 150 300 950
IT97K-1069-6 400 250 140 790
IT-16 950 720 - 1,670
IT98K-390-2 150 140 - 290
Total 2,700 1,780 1,090 5,570
Tanzania
Table 5-9b: Quantities (kg) of seed of the selected lines multiplied by participating farmers in Tanzania, 2010
Cowpea line Iringa Dodoma Bahi Kongwa Total
Uhominyi Mpunguzi Ilindi Mbande
IT00K-1263 70 220 857 40 1187
IT99K-1122 90 - 1040 20 1150
Evaluation of breeding lines for resistance to bacterial blight and viruses
All the cowpea lines which seeds were multiplied and shared with NARS colleagues were tested in
order to ascertain their resistance to bacterial blight and viruses in the greenhouse at Ibadan. The results
showed that some of the lines are resistant to bacterial blight as well as virus diseases (see Table 5-10).
Thirteen of the 50 breeding lines from IITA which included IT00K-1263, IT99K-1060, IT99K-1122 and
IT99K-1111-1 were highly resistant to bacterial blight, an important cowpea disease. The local line
Danila which is drought tolerant also showed high level of resistance to the disease.
Table 5-10: Responses of some improved cowpea breeding lines to Cowpea aphid-borne mosaic virus;
(CABMV), Cowpea mild mottle virus (CPMMV) and Cowpea mottle virus (CPMoV)
*Genotype response to:
Genotype
CPMoV CABMV CPMMV
IT98K-133-1-1 Early R R R
IT99K-1122 Early R HS R
IT98K-390-2 Striga R MR R
IT98K-1092-1 Striga R MR R
IT97K-1069-6 Medium R MR R
IT04K-405-5 Dual R R MR
IT00K-901-5 Early MR MR R
IT98K-412-13 Dual MR MR R
IT97K-819-118 Striga MR S MR
IT99K-1060 Early S MR MR
IT99K-573-1-1 Striga R R R
*R = resistant (symptom score 0 to 1); MR = moderately resistant (symptom score 2); S = susceptible (symptom score 4); HS = highly
susceptible (symptom score 5)
Evaluation for phosphorus-use efficiency
Greenhouse potted soil (a mixture of subsoil and acid-washed sand) experiment was conducted to
evaluate variation in phosphorus use and response efficiency. Nodulation generally varied among
genotypes and so was the response to phosphorus application. Nodulation was highest in dual purpose
lines such as IT98K-166-44 but response to phosphorus application was higher in IT89KD-288
than IT98K-166-44. There were highly significant (P≤0.001) genotype, phosphorus and genotype
phosphorus effects on the utilization of P for shoot development. The genotype IT89KD-288 was the
Progress of Phase 1
99