Identification of suitable parents and temperatures for breeding Potato virus Y (PVY) and Potato virus X (PVX) resistant potatoes
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Date
2011Author
Onditi, JO.
Njoroge, Kiarie.
Shibairo, Solomon I.
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Mixed infection of Potato virus Y (PVY) and Potato virus X (PVX) together with other potato
viruses have the potential of causing yield losses of up to 80 % in the major varieties grown in
Kenya. In search for suitable resistant parents and a favourable temperature range for cross
breeding, seven virus resistant potato genotypes from International Potato Centre (CIP), Lima
Peru were test crossed (progeny tested) with one local PVY and PVX susceptible cultivar (Tigoni)
under low (11-18◦C), medium (18-27◦C) and high temperatures (28-34◦C) at the Kenya
Agricultural Research Institute (KARI), Tigoni. Low temperature range of (11-18◦C) with the
highest percentage (43%) of successful crosses was identified as the most favourable for cross
breeding. Among the seven CIP clones tested, CIP395196.4 gave the highest percentage (98 %)
of resistant progenies and was found to have multiplex Ry Ry Ry ry / Ry Ry Ry Ry genes for
PVY and PVX resistance. This type of parent was the most suitable for cross breeding because it
produced significantly (P=0.05) 100% resistant progenies when crossed with a susceptible
cultivar hence eliminating the need (cost and labour) for preliminary seedling screening.
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