Abstract
This study was conducted to evaluate the growth and yield stability of cassava mosaic disease (CMD) resistant breeding populations clones against early drought. Field trials were planted using 200 CMD resistant clones and 7 local landraces in a randomised complete block design with 3 replicates at the International Institute of Tropical Agriculture (IITA) station, Sendusu in Namulonge (Central Uganda) during the second rains of 2006 (2006B) and the first rains of 2007 (2007A). The 2007A crop suffered from drought stress in the first 4 months after planting (MAP). Data were taken on the leaf lobe length and width at 6 MAP and plant height at 12 MAP. Harvest was done at 12 MAP during which the number of storage roots per plant and storage root yield were recorded. Data were analysed using the Mann-Whitney U test to compare crop performance between the 2 seasons. The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per plant and higher storage root yield than the 2007A crop. There was no significant difference in the leaf lobe width. In this experiment, it was observed that the CMD resistant breeding clones were susceptible to early drought and thus it was recommended that selections should be done for higher water use efficiency. Key words: Abscisic acid, Manihot esculenta Crantz, Stomatal conductance, water use efficiency, Uganda.
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Claims 7
Claim · model-written summary
Leaf lobes were significantly longer in the 2006B crop than in the drought-stressed 2007A crop.
- Taxon
- cassava
Manihot esculentae0 - Treatment
- drought stresse1
- Outcome
- leaf lobese2
- Direction
- longere2
- Value
- P<0.01e2
- Comparator
- 2007A crope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e1“The 2007A crop suffered from drought stress in the first 4 months after planting”
e2“The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per plant and higher storage root yield than the 2007A crop”
Claim · model-written summary
Plants were significantly taller in the 2006B crop than in the drought-stressed 2007A crop.
- Taxon
- cassavaManihot esculentae0
- Treatment
- drought stresse1
- Outcome
- plant heightse2
- Direction
- tallere2
- Value
- P<0.01e2
- Comparator
- 2007A crope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e1“The 2007A crop suffered from drought stress in the first 4 months after planting”
e2“The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per plant and higher storage root yield than the 2007A crop”
Claim · model-written summary
Number of storage roots per plant was significantly higher in the 2006B crop than in the drought-stressed 2007A crop.
- Taxon
- cassavaManihot esculentae0
- Treatment
- drought stresse1
- Outcome
- number of storage roots per plante2
- Direction
- highere2
- Value
- P<0.01e2
- Comparator
- 2007A crope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e1“The 2007A crop suffered from drought stress in the first 4 months after planting”
e2“The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per plant and higher storage root yield than the 2007A crop”
Claim · model-written summary
Storage root yield was significantly higher in the 2006B crop than in the drought-stressed 2007A crop.
- Taxon
- cassavaManihot esculentae0
- Treatment
- drought stresse1
- Outcome
- storage root yielde2
- Direction
- highere2
- Value
- P<0.01e2
- Comparator
- 2007A crope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e1“The 2007A crop suffered from drought stress in the first 4 months after planting”
e2“The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per plant and higher storage root yield than the 2007A crop”
Claim · model-written summary
Leaf lobe width did not differ significantly between the seasons.
- Taxon
- cassavaManihot esculentae0
- Treatment
- drought stresse1
- Outcome
- leaf lobe widthe3
- Direction
- no significant differencee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e1“The 2007A crop suffered from drought stress in the first 4 months after planting”
e3“There was no significant difference in the leaf lobe width”
Claim · model-written summary
CMD-resistant breeding clones were susceptible to early drought.
- Taxon
- cassavaManihot esculentae0
- Treatment
- early droughte4
- Outcome
- susceptible to early droughte4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e4“it was observed that the CMD resistant breeding clones were susceptible to early drought”
Claim · model-written summary
Selection of cassava clones should be done for higher water use efficiency.
- Taxon
- cassavaManihot esculentae0
- Outcome
- water use efficiencye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava mosaic disease (CMD) resistant breeding populations clones”
e5“selections should be done for higher water use efficiency”
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