Spontaneous hybrids between naturalised populations of pak choi (Brassica rapa var. chinensis) and wild turnip (B. rapa var. oleifera) from near Ashburton, Canterbury, New Zealand.

摘要

Natural intraspecific hybrids between Brassica rapa var. chinensis, B. chinensis and B. rapa var. oleifera, B. campestris are documented and analysed from a single wild population near Ashburton, Canterbury, New Zealand. Principal Component Analysis of 13 leaf morphological characters identified putative F1 hybrids that are intermediate between the parents. A second group of plants that are highly variable probably represent F2 and/or backcross hybrids. The putative parents and the hybrid plants all had high percentages of pollen stainability, indicative of normal meiosis. Flow cytometry data are consistent with the hybrid plants being derived from intraspecific B. rapa crosses. This study has shown that closely related intraspecific taxa in Brassica can form natural hybrid populations in New Zealand and, therefore, gene flow between such closely related taxa can readily occur..