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Different flooding responses in Rorippa amphibia and Rorippa sylvestris , and their modes of expression in F 1 hybrids
Author(s) -
Stift Marc,
Luttikhuizen Pieternella C.,
Visser Eric J.W.,
Van Tienderen Peter H.
Publication year - 2008
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2008.02547.x
Subject(s) - biology , hybrid , introgression , botany , gene , genetics
Summary• The river floodplain species Rorippa amphibia , Rorippa sylvestris , and their hybrid Rorippa × anceps were studied here, with the aim of identifying potential species differences with respect to flooding tolerance, and of assessing their expression in F 1 hybrids. • Parents and their F 1 hybrids were subjected to three flooding treatments mimicking natural conditions, and growth‐related and leaf morphological traits were compared. • In contrast to R. sylvestris , R. amphibia responded to waterlogging by forming specialized roots, and its growth was not reduced. These traits were dominantly expressed in hybrids. Both species and the hybrids established shoot growth over 2 wk of complete submergence. Only in R. sylvestris was this not at the expense of root biomass, suggesting that R. sylvestris can photosynthesize underwater. Rorippa sylvestris also showed a hyponastic response. Hybrids were intermediate to the parents in this respect. • This study shows that phenotypic expression of parental traits in F 1 hybrids is mostly additive, but can also be dominant. This suggests that a large overlap in habitat use of parents and hybrids is likely. If such an overlap occurs, the main evolutionary consequences of hybridization in Rorippa will be the introgression of genes, as the hybrids are fully fertile.