Four Seasons of Learning and Engaging Smallholder Farmers - icrisat
Four Seasons of Learning and Engaging Smallholder Farmers - icrisat
Four Seasons of Learning and Engaging Smallholder Farmers - icrisat
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Number <strong>of</strong> degree training students (MSc, PhD) completed or ongoing<br />
Our original milestone called for two PhD c<strong>and</strong>idates to advance in their studies <strong>and</strong> two MSc c<strong>and</strong>idates<br />
to complete their degrees. In addition to this, it was possible to give partial operational support to two<br />
other students, only one <strong>of</strong> whom finished his degree. At one time we saw the opportunity to stretch<br />
funding to include another PhD c<strong>and</strong>idate in place <strong>of</strong> one <strong>of</strong> the MSc c<strong>and</strong>idates, but that person<br />
withdrew his c<strong>and</strong>idacy when an opportunity arose to study in New Zeal<strong>and</strong>, <strong>and</strong> the funding was<br />
used for an MSc as originally planned. Degree training proved to be an excellent bridge between the<br />
TL I <strong>and</strong> TL II projects, as several theses were derived from topics directly from TL I , or closely akin to<br />
themes developed there.<br />
Degree training: scholarships<br />
Berhanu Amsalu <strong>of</strong> EIAR, Melkassa Research Center in Nazareth, Ethiopia is in his last year <strong>of</strong> PhD<br />
study at the University <strong>of</strong> Pretoria, Republic <strong>of</strong> South Africa, with expectations to finish in late 2011.<br />
Berhanu is studying aspects <strong>of</strong> nitrogen fixation in common bean under drought, looking at the activity<br />
<strong>of</strong> protease inhibitors as indicators <strong>of</strong> nodule health. It is known that as legumes come under stress,<br />
nodules degrade under the influence <strong>of</strong> proteases that break down proteins including nitrogenase. Lower<br />
protease activity (or conversely, more activity <strong>of</strong> protease inhibitors) could be an indicator <strong>of</strong> nodule<br />
health, especially under stress when fixation tends to decline. Berhanu initiated with a greenhouse<br />
study <strong>of</strong> soybean (thus, his thesis <strong>and</strong> his results could eventually be relevant for BNF <strong>of</strong> soybean under<br />
stress as well). Subsequently Berhanu continued greenhouse studies on common bean with the high<br />
nitrogen fixing line BAT 477, the poor fixer DOR 364, <strong>and</strong> their progenies. He also carried out a field<br />
trial with the same genotypes. Finally he executed a trial looking at the interaction <strong>of</strong> drought x P levels,<br />
under the hypothesis that the protease degradation <strong>of</strong> nodules is a generalized mechanism in response<br />
to stress, <strong>and</strong> that BAT 477 will show low activity <strong>of</strong> proteases under both moisture stress <strong>and</strong> low P<br />
stress. He currently is assaying protease activity to test this hypothesis.<br />
Godwill Makunde <strong>of</strong> Zimbabwe is completing one more cycle <strong>of</strong> field work in his home country, <strong>and</strong><br />
then will return to Free State University, RSA, to analyze his data <strong>and</strong> to write his thesis. He should be<br />
finishing toward the end <strong>of</strong> 2011. His university expenses have been financed by TL-II, <strong>and</strong> his research<br />
has been supported mostly by TL-I. His research involves a physiological analysis <strong>of</strong> the TL I reference<br />
collection, which is a sub-set <strong>of</strong> 202 accessions from the CIAT core collection, re-selected based on<br />
detailed molecular analysis <strong>and</strong> employing a more focused attention on race Durango from Mexico,<br />
<strong>and</strong> on Andean types. These two groups were emphasized with the philosophy that race Durango<br />
might yield new sources <strong>of</strong> drought resistance, <strong>and</strong> the Andean types were those that were most in<br />
need <strong>of</strong> improvement, <strong>and</strong> that it would be useful to take advantage <strong>of</strong> whatever variability that exists<br />
among the Andeans. Godwill will have two seasons’ data from Zimbabwe, <strong>and</strong> three seasons’ data<br />
from Colombia under varying degrees <strong>of</strong> moisture stress. Godwill himself executed the physiological<br />
sampling <strong>and</strong> analysis <strong>of</strong> the reference collection in CIAT-Colombia under intense terminal stress. He<br />
also conducted root phenotyping studies at CIAT-Colombia on selected genotypes from the reference<br />
collection. With data from several sites <strong>and</strong> seasons, Godwill will perform an analysis <strong>of</strong> association<br />
mapping using SNP data generated at UC-Davis in the group <strong>of</strong> Doug Cook. This will be the first such<br />
attempt in common bean.<br />
Felix Waweru graduated from the University <strong>of</strong> Nairobi, Kenya with an MSc degree in a study shared<br />
with TL I. Felix carried out a field phenotyping <strong>of</strong> recombinant inbred lines (RILs) <strong>of</strong> a cross <strong>of</strong> BAT 881<br />
x G21212. BAT 881 is sensitive to abiotic stress, <strong>and</strong> G21212 is relatively resistant. G21212 was first<br />
recognized as tolerant to low soil P, <strong>and</strong> subsequently it also proved to have a good response to drought<br />
<strong>and</strong> aluminum toxicity. It presents excellent remobilization <strong>of</strong> photosynthate to grain under stress, <strong>and</strong><br />
this appears to be its mechanism <strong>of</strong> multiple stress resistance. A genetic map exists for this population,<br />
<strong>and</strong> the data <strong>of</strong> Felix could help elucidate the inheritance <strong>of</strong> this trait. Felix also analyzed a regional<br />
collection <strong>of</strong> l<strong>and</strong>races <strong>and</strong> lines, compiled under TL I.<br />
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<strong>Engaging</strong> <strong>Smallholder</strong> <strong>Farmers</strong> | Tropical Legumes II Project