Abstract Detail

Crops and Wild Relatives

Nicolao, Rodrigo [1], Bashir, Ikram [2], Marques Castro, Caroline [3], Heiden, Gustavo [4].

Assessing the role of stable and variable morphological traits on the taxonomy of wild potatoes (Solanum sect. Petota, Solanaceae).

Phenotypic plasticity observed in potato wild relatives (Solanum sect. Petota) can impact the accuracy of taxonomic circumscriptions based on some morphological traits. The environment conditions contribute to the making of phenotypes and could mask genetically based relationships. Based on these premises, we evaluated the stability and variability of some morphological characters commonly considered on the taxonomy and applied as germplasm descriptors to discriminate wild potato species and accessions. We evaluated accessions of S. chacoense (8), S. commersonii (8), and S. malmeanum (1). They were grown under two temperature conditions. Control temperature ranges from 14 to 27°C and Heat stress treatment ranges from 24 to 34°C. The photoperiod was 12 hours (7:00 am to 7:00 pm) with a light intensity of approximately 400 μmol m-2 s-1, where they remained until harvest. Experimental design in complete randomized blocks, with two repetitions. Analyzes of variance were performed with 'metan' package in RStudio. The GxE interaction effect was detected in seven of 31 characters: V3- Ratio: length of leaf/width of leaf, V8- Terminal leaflet width (cm), V9- Ratio: length of terminal leaflet/width of terminal leaflet, V12- Primary dorsal lateral leaf segment length (cm), V14- Ratio: length / width primary lateral leaflet, V16- Primary dorsal lateral leaflet petiole (mm), V21- Pedicel length (cm): from base. The GxE interaction effect was not significant (p<0.05) for the characters: V1- Leaf lenght (cm); V2- Leaf wide (cm); V4- Shaft length to the widest point on the sheet (cm); V5- Length from widest part of leaf to apex (cm); V6- Ratio: length from widest part of leaf to apex/length of leaf; V7- Terminal leaflet length (cm); V10- Axis length to the widest point of the terminal leaflet (cm); V11- Length of the terminal leaflet petiole (cm); V13- Width primary dorsal lateral segment (cm); V15- Axis length to widest point of primary dorsal leaflet (cm); V17- Number of primary lateral leaflets segments; V18- Number of secondary and tertiary lateral leaflets segments; V19- Peduncle length (cm); V20- Pedicel lenght (cm); V22- Ratio: length of pedicel from base to articulation/length of pedicel; V23- Calyx lacinia length (mm); V24- Total calyx length (mm); V25- Total calyx length (mm): lobe of calyx; V26- Width of calyx lobe base (mm); V27- Lacinia sepal length (mm); V28- Radius of apex of corolla lobe (mm); V29- Radius of apex of corolla lobe (mm): corolla base radius; 30- Width of base of corolla lobe measured at widest point (mm); V31- Anther lenght (mm). GxE was detected in many characters. This interaction implies variation among genotypes or degree of response (or both) to treatments. The first implies differences in adaptative ability among genotypes that could represent different species, last indicates that some genotypes are more plastic than others and suggests variation in adaptative strategy. The characters with non-significant (p<0.05) GxE interaction are stable and could be useful for morphological taxonomic characterization.

1 - Universidade Federal de Pelotas, Agronomy/Plant Breeding, Capão do Leão, RS, 96160-000
2 - Universidade Federal de Pelotas, Capão do Leão, RS, Brazil
3 - Embrapa, Pelotas, RS, Brazil
4 - EMPBRAPA Clima Temperado (Brazil)

Wild relatives.

Presentation Type: Oral Paper
Number: CWR1001
Abstract ID:851
Candidate for Awards:None

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