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Table 26 continued<br />
Institution Location Entries<br />
Department of Agriculture Lalitpur, Nepal 8<br />
University of Ibadan Ibadan, Nigeria 84<br />
Ministry of Agriculture & Natural Resources Jos, Nigeria 13<br />
University of Philippines Laguna, Philippines 408<br />
University of Puerto Rico Mayaguez, Puerto Rico 100<br />
Agricultural Research Station<br />
Maha Illuppallama,<br />
24<br />
Sri Lanka<br />
Hudeiba Research Station El-Damer, Sudan 8<br />
Masalato Christian Education Centre Dodoma, Tanzania 50<br />
Agricultural Research Station, Bangkhen Bangkok, Thailand 2<br />
Tabk 27. Number of seeds per pod and 100-seed weight of early maturing and check cultivars of<br />
pigeonpea.<br />
Seeds per pod<br />
100-seed weight<br />
Checks & Selections Range Mean Range Mean<br />
PANT, A-3 (1)<br />
Selections 3.5-4.2<br />
P<strong>RA</strong>BHAT (2)<br />
Selections 3.3-5.1<br />
UPAS-120 (3)<br />
Selections 3.0-5.3<br />
(no) (no) (g) (g)<br />
3.4<br />
4.0 9.0-15.6<br />
3.4<br />
4.1 -<br />
3.6<br />
4.1 7.8-15.4<br />
8.7<br />
10.1<br />
6.3<br />
10.7<br />
7.7<br />
11.1<br />
the male-sterility factor in population breeding,<br />
and grew a population involving crosses of the<br />
sterile with 14 parent lines. We compared the<br />
pod-set on sterile plants (resulting from insect<br />
pollination) and found 49 percent of 3 735 tagged<br />
buds set pods on male-sterile plants compared<br />
with 58 percent of 2120 buds tagged on normal<br />
fertile plants in the same population. (These buds<br />
were all tagged at the peak of flowering, and the<br />
percent pod-set is considerably higher than the<br />
observed pod-set over the entire flowering<br />
period.)<br />
Under conditions at ICR1SAT Center it appears<br />
that pollination of the steriles is sufficient<br />
for them to be useful in population breeding. We<br />
are expanding our studies of natural crossing on<br />
the steriles to determine their possible usefulness<br />
in large-scale crossing bf specific genotypes.<br />
Rhizobium P o p u l a t i o n s i n S o i l<br />
We are using the soil dilution-plant infection<br />
method of counting cowpea-type rhizobia using<br />
Siratro (Macroptilium atropurpureum) as the test<br />
plant. When 160 strains isolated from pigeonpea<br />
nodules were tested, most nodulated Siratro -<br />
although 14 percent were slow to do so. A small-
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