Details

Autor(en) / Beteiligte

• Matesanz, S
• Ramos-Muñoz, M
• Moncalvillo, B
• Rubio Teso, M L
• García de Dionisio, S L
• Romero, J
• Iriondo, J M
• Castilla, Antonio

Titel

Plasticity to drought and ecotypic differentiation in populations of a crop wild relative

Ist Teil von

• AoB plants, 2020-04, Vol.12 (2), p.plaa006-plaa006

Ort / Verlag

US: Oxford University Press

Erscheinungsjahr

2020

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Abstract Populations of widely distributed species often exhibit geographic variation in functional traits in response to environmental heterogeneity. Such trait variation may be the result of different adaptive mechanisms, including genetically based differentiation, phenotypic plasticity or a combination of both. Disentangling the genetic and environmental components of trait variation may be particularly interesting in crop wild relatives, since they may provide unique reservoirs of genetic diversity for crop improvement. In this study, we assessed ecotypic differentiation and patterns of plasticity to drought in populations of Lupinus angustifolius, a Mediterranean crop wild relative, from two climatically distinct regions in the Iberian Peninsula. Using an outdoor common garden, we compared phenotypic responses of inbred maternal families to two ecologically meaningful water availability treatments (drought and high-moisture). We measured 18 different functional traits related to growth, morphology, phenology and reproduction. Plants in the drought treatment grew less, had lower leaf chlorophyll content and photochemical efficiency, but also reproduced faster, produced larger seeds and altered leaflet morphology through increased leaflet thickness, higher leaflet dry matter content and lower specific leaf area. We also found significant differences between regions that likely reflect adaptation to climatically distinct environments, with populations from the south showing a faster onset of reproduction, higher leaf thickness and higher seed size, consistent with the drier conditions experienced in southern sites. Plasticity to drought was in most cases in the same direction as quantitative genetic differentiation (i.e. cogradient variation), providing evidence of the adaptive value of the plastic change. Our results show that both genetic differentiation and plasticity can generate adaptive phenotypic variation in L. angustifolius, and help to identify potentially valuable genetic resources to incorporate into breeding programmes. We assessed adaptive differentiation and phenotypic plasticity in populations of Lupinus angustifolius, a Mediterranean crop wild relative, from two regions in the Iberian Peninsula. We compared how plants from different populations responded to two water availability treatments, drought and high-moisture, and measured several functional traits. Plants in the drought treatment reproduced faster, produced larger seeds and showed changes in leaf morphology, consistent with adaptive plasticity. Significant differences between regions likely reflect adaptation of the southern populations to their drier environment. We conclude that both genetic differentiation and plasticity can contribute to the adaptation of L. angustifolius to different water availability environments, and help to identify valuable genetic resources for breeding.