@article{Faehnrich.2020,

title = {Towards pollen sterility in German chamomile (Matricaria chamomilla L.) - conventional breeding approaches of cytoplasmic/genic male sterility and chemical emasculation},

author = {B. Faehnrich and J. Huber and S. Wagner and C. Franz and B. Fraust and M. Wehrle and J. Ruzicka and J. Novak and L. Otto },

url = {https://onlinelibrary.wiley.com/doi/full/10.1111/pbr.12859},

doi = {https://doi.org/10.1111/pbr.12859},

year  = {2020},

date = {2020-09-03},

urldate = {2020-09-03},

journal = {Plant Breeding},

volume = {136},

abstract = {Pollen sterility (PS) in mother lines is crucial for hybrid crossings in plant breeding. 21 di-- (2x) and tetraploid (4x) accessions of the hermaphroditic chamomile were screened for spontaneous, thermic or gametocide induced PS. Two crossing trials with the diploid accessions 'Bona' (BON) and 'Hungary 2' (HUN2) should specify maternally inherited cytoplasmic male sterility (CMS). Progeny thereof showed increased PS. BON as mother (BH) entailed means of 30 and 22% PS, versus 8% and 20% after reciprocal crossings. Backcrosses of BH with HUN2 in paternal and maternal direction revealed increasing mean PS (24% and 32%), without verification of CMS. A split plot design of 100 individuals treated with four chemical gametocides analyzed PS, seed set, germination rate and whole plant damage. Tri--iodobenzoic acid caused the highest PS (43%). Progeny of two plants (2x, 4x) with degenerated anthers without pollen, showed 100% PS either in tetraploid F1 and F2 (4% and 11%) or in diploid F2 and F3 (26% and 23%). High temperature (30/28°C day/night) decreased the male fertility to some extent.},

keywords = {CMS, gametocide, hybrid breeding, male sterility, Matricaria chamomilla, pollen},

pubstate = {published},

tppubtype = {article}

}