Morphological Characterization of sweetpotato Germplasm Collection
The International Potato Center (CIP) conserves one of the largest collections of sweetpotato germplasm as public good under the International Treaty on Plant Genetic Resources for Food and Agriculture (ITPGRFA) with 5,620 accessions maintained in vitro. The sweetpotato germplasm is available for distribution to requestors for research, education, and plant breeding purposes. This material has been characterized using 30 standard morphological descriptors according to published descriptors for sweetpotato (CIP, AVRDC and IBPGR, 1991).
The morphological characterization has been carried out at the San Ramon experimental station in the department of Junin - Perú at 800 m altitude.
Cluster analysis of the morphological data was performed with NTSYS-pc software, version 1.70 (Rohlf 1992) based on the simple matching coefficient and the unweighted pair-group method using an arithmetic average (UPGMA).
El Centro Internacional de la Papa (CIP) conserva una de las mayores colecciones de germoplasma de camote como bien público bajo el Tratado Internacional sobre los Recursos Fitogenéticos para la Alimentación y la Agricultura (TIRFAA) con 5,620 accesiones de camote conservadas in vitro. El germoplasma de camote está disponible para distribución a diferentes solicitantes con fines de investigación, educación, y fitomejoramiento Este material se ha caracterizado con 30 descriptores morfológicos estándar para camote según CIP, AVRDC e IBPGR (1991).
La caracterización morfológica se realiza en la estación experimental de San Ramon en el departamento de Junin – Perú a 800 m.s.n.m..
El análisis de conglomerados de los datos morfológicos se realizó con el programa NTSYS-pc, versión 1.70 (Rohlf 1992) basado en el coeficiente de coincidencia simple y el método de grupos de pares no ponderados utilizando un promedio aritmético (UPGMA).
Apxial leaf vein pigmentation
Describe the most frequent expression of the distribution of anthocyanin (purple) pigmentation shown in the veins of the leaves lower surface
Mature leaf size
Length from the basal lobes to the tip of the leaves. Record the average expression of at least 3 leaves located in the middle section of the vine.
Leaf lobe number
Most leaves of sweet potato have two basal lobes and they should not be counted. Record the predominant number of the lateral and central leaf lobes observed on the leaves located in the middle of section of the vine.
Generally sweet potatoes have 1,3,5,7 or 9 leaf lobes. If the leaf has no lateral lobes but shows a central tooth this number is 1. If the apical portion of the leaf is totally rounded this number is 0.
Distribution of the anthocyanin (purple) pigmentation in the petioles of leaves. Indicate the most predominant colour first
Average petiol length, from the base to the insertion with the blade, of at least 3 leaves in the middle portion of the main vine.
Immature leaf colour
Describe the overall foliage colour considering the colour of the fully expanded immature leaves of several plants. The variegation in leaf colour due to virus symptoms should not be recorded.
Mature leaf colour
Describe the overall foliage colour considering the colour of the fully expanded mature leaves of several plants. The variegation in leaf colour due to virus symptoms should not be recorded.
Storage root shape
Storage root outline shown in longitudinal section.
Ability of vines to climb adjacent stakes placed in those accessions showing twining characters
Vine internode diameter
Average diameter of at least three internodes located in the middle section of the vine.
Length of the main vines
Predominant vine colour
Anthocyanine (purple pigmentation) present in the vines beside the green colour. The predominant colour should be evaluated considering the whole vine from base to tip.
Vine tip pubescence
Degree of hairiness of immature leaves recorded at the apex of the vines
Vine internode length
Average length of at least three internodes located in the middle section of the vine.
Secondary vine colour
Anthocyanine (purple pigmentation) present in the vines beside the green colour. The predominant colour should be evaluated considering the whole vine from base to tip. The secondary colour is more easily evaluated using younger vines.
Storage root formation
Arrangement of the storage roots on the underground stems.
Latex production in storage roots
Amount of latex observed after cross sectioning medium-sized storage roots
Oxidation in storage roots
Amount of browning due to oxidation observed 5-10 seconds after storage roots are cut in cross. Sepicify in reference or reference cultivar
List of accessions included in the dataset