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Target Crops
Cassava
| Maize | Rice
| Sweetpotato | Wheat
Sweetpotato - Breeding Improved, High Beta Carotene
Sweetpotato for Sub-Saharan Africa
Background
| VITAA
Parternship
Summary
Efforts to develop new sweetpotato plant types with
high dry matter and high beta- carotene for Sub-Saharan
Africa were initiated in 1996 at CIP’s headquarters
research site in Lima, Peru. More than 100 different
types of sweetpotato were used as parental material.
In all, more than 150,000 offspring were developed and
put through five seasons of recurrent selection and
evaluation. Of these, just 100 superior clones were
selected for shipment to overseas in 2002 (see list
attached). All are high yielding, high in beta-carotene
and contain sufficient dry matter to meet local taste
preferences and market standards. Because there is significant
variation among the clones, farmers will have many options
to choose from in selecting clones suited to local conditions,
taste preferences and market standards.
Technical Notes
- Because of the negative genetic linkage between
dry matter and beta-carotene content in sweetpotato,
CIP breeders used recurrent mass selection to break
the negative linkage so that high dry matter and high
beta-carotene could be combined. Parental clones were
induced to flower by grafting onto Ipomoea nil.
- All selected clones were thoroughly evaluated for
fresh yield, ß-carotene and dry matter content,
resistance to root knot nematode (Meloidogyne incognita)
and virus diseases.
- The 42 advanced clones proved to have significantly
higher fresh yield and dry matter content than the
check cultivars ("Jewel" and "Xushu
18").
Table. High dry matter and orange flesh sweetpotato
accessions selected for pathogen clean up, CIP, 2001
| Code |
Accession number |
Dry matter content
(%) |
Fresh yield (t/ha)
|
DM yield (t/ha) |
Skin
color |
Flesh
color |
|
1 |
199069.7 |
30.0 |
36.6 |
11.0 |
Creamy |
Light orange |
|
2 |
199001.16 |
30.2 |
31.3 |
10.6 |
Dark copper |
Light orange |
|
3 |
199005.9 |
30.3 |
33.2 |
10.1 |
Pink |
Light orange |
|
4 |
199024.8 |
30.5 |
35.2 |
10.7 |
Red |
Light orange |
|
5 |
199038.9 |
30.8 |
37.7 |
11.6 |
Pink |
Light orange |
|
6 |
199003.2 |
31.0 |
35.3 |
12.3 |
Light purple |
Light orange |
|
7 |
199029.3 |
31.1 |
32.9 |
10.2 |
Red |
Light orange |
|
8 |
199067.1 |
31.1 |
33.6 |
10.3 |
Creamy |
Light orange |
|
9 |
199030.4 |
31.1 |
34.4 |
10.7 |
Light purple |
Light orange |
|
10 |
199014.7 |
31.2 |
38.2 |
12.0 |
Red |
Light orange |
|
11 |
199021.7 |
31.3 |
38.3 |
11.9 |
Light purple |
Light orange |
|
12 |
199025.17 |
31.3 |
40.4 |
12.6 |
Light copper |
Light orange |
|
13 |
199035.7 |
31.7 |
41.3 |
13.1 |
Creamy |
Light orange |
|
14 |
199027.8 |
32.2 |
33.6 |
10.8 |
Red |
Light orange |
|
15 |
199034.5 |
32.4 |
31.5 |
10.2 |
Light purple |
Light orange |
|
16 |
199014.2 |
32.5 |
33.0 |
10.7 |
Red |
Light orange |
|
17 |
199001.4 |
33.0 |
30.1 |
11.2 |
Creamy |
Light orange |
|
18 |
199034.7 |
33.1 |
39.5 |
13.1 |
Red |
Light orange |
|
19 |
199016.3 |
33.3 |
33.0 |
11.0 |
Light copper |
Light orange |
|
20 |
199073.2 |
35.3 |
30.1 |
10.6 |
Creamy |
Light orange |
|
21 |
199029.2 |
35.5 |
44.2 |
15.7 |
Red |
Light orange |
|
22 |
199037.1 |
35.6 |
38.9 |
13.9 |
Creamy |
Light orange |
|
23 |
199003.5 |
35.6 |
42.4 |
17.0 |
Yellow |
Light orange |
|
24 |
199069.1 |
37.0 |
37.5 |
13.9 |
Creamy |
Light orange |
|
25 |
199020.2 |
37.5 |
34.8 |
13.0 |
Pink |
Light orange |
|
26 |
199057.4 |
37.9 |
45.8 |
17.5 |
Light purple |
Light orange |
|
27 |
199004.9 |
38.3 |
34.5 |
13.3 |
Red |
Light orange |
|
28 |
199004.2 |
38.6 |
32.8 |
14.3 |
Pink |
Light orange |
|
29 |
199033.7 |
31.1 |
31.6 |
9.8 |
Red |
Orange |
|
30 |
199020.1 |
31.2 |
32.8 |
10.3 |
Light purple |
Orange |
|
31 |
199034.16 |
31.5 |
36.3 |
11.4 |
Yellow |
Orange |
|
32 |
199034.13 |
31.6 |
30.7 |
9.7 |
Light purple |
Orange |
|
33 |
199035.2 |
32.1 |
37.3 |
11.9 |
Light copper |
Orange |
|
34 |
199062.1 |
32.5 |
52.0 |
16.9 |
Light copper |
Orange |
|
35 |
199021.5 |
33.0 |
30.3 |
10.0 |
Pink |
Orange |
|
36 |
199033.4 |
34.6 |
37.8 |
13.0 |
Red |
Orange |
|
37 |
199021.3 |
34.9 |
34.4 |
12.0 |
Light copper |
Orange |
|
38 |
199040.6 |
30.0 |
45.1 |
13.5 |
Pink |
Orange |
|
39 |
199015.12 |
31.2 |
34.3 |
10.7 |
Red |
Orange |
|
40 |
199034.12 |
32.5 |
38.1 |
12.3 |
Light purple |
Orange |
|
41 |
199004.3 |
32.6 |
34.0 |
12.5 |
Red |
Orange |
|
42 |
199024.6 |
33.0 |
37.3 |
12.3 |
Light purple |
Orange |
|
|
|
|
|
|
|
|
|
|
Mean |
32.9 |
36.2 |
12.1 |
|
|
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