Inheritance of Phosphorus use Efficiency and Resistance to Anthracnose in Selected Sorghum Genotypes Grown in the Acid Soils of Western Kenya
Abstract
186 words
The acid soils of Western Kenya where most of the sorghum is
grown have very low available phosphorus, and thus cannot
support optimal sorghum productivity. In addition, foliar
anthracnose (Colletotrichum sublineolum L.) also reduces
sorghum yield. Inorganic phosphorus fertiliser supplementation
is not economically viable for resource constrained farmers in
these areas. Since both problems tend to occur together, there
is need for varieties that carry both anthracnose resistance and
high phosphorus use efficiency (PUE). This study seeks to
determine the mode of inheritance to PUE and resistance to
anthracnose to support breeding for multiple stress tolerance in
sorghum. Crosses were made between parents contrasting for
the two traits and genetic analysis conducted on F2 progeny for
both traits. Recombinant F2 populations were screened at Sega,
a low P site in Western Kenya for PUE and at Kibos, a disease
hotspot for anthracnose reaction. It is expected that some
families/recombinants will be recovered that are PUE and
resistant to anthracnose. Such lines will be advanced to develop
varieties with multiple stress tolerance to both stresses. Such
varieties will have potential for cultivation in western Kenya
and Uganda
Subjects
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