Spikelet movements, anther extrusion and pollen production in wheat cultivars with contrasting tendencies to cleistogamy

BMC Plant Biology

Bożena Denisow¹  Barbara Łotocka²  Urszula Zajączkowska³  Alicja Dołkin-Lewko³  Monika Rakoczy-Trojanowska⁴ 

[1] Department of Botany and Plant Physiology, University of Life Sciences in Lublin, 15 Akademicka Street, 20-950, Lublin, Poland;Department of Botany, Institute of Biology, Warsaw University of Life Sciences – SGGW, 159 Nowoursynowska Street, 02-776, Warszawa, Poland;Department of Forest Botany, Institute of Forest Sciences, Warsaw University of Life Sciences – SGGW, 159 Nowoursynowska Street, 02-776, Warszawa, Poland;Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences –SGGW, 159 Nowoursynowska Street, 02-776, Warszawa, Poland;

关键词: Cleistogamy;    Dacanto;    Flower opening;    Lemma kinetics;    Spikelet anatomy;    Piko;    Pollen dispersion;    Triticum aestivum;    Wheat breeding;   

DOI  :  10.1186/s12870-021-02917-7

来源: Springer

【 摘 要 】

BackgroundCleistogamic flowers are a main barrier in pollen dispersal for cross-pollination necessary in wheat hybrid breeding. The aim of our study was to gain new knowledge on the biology of wheat flowering, in particular on the differences between the cleisto- and chasmogamic forms which has certainly cognitive significance, but it can also be used in practice when seeking a female and male ideotypes for cross hybridization.ResultsWe characterized the most significant features defining the flowering specificity in two wheat cultivars with contrasting tendency to cleistogamy: Piko (chasmogamous) and Dacanto (cleistogamous). In the field observations we assessed diurnal pattern of anther extrusion and anther extrusion capacity. For the first time we adapted the time lapse method for measuring kinetics of the spikelet movement and 3-D image correlation technique for the non-invasive measurements of potential deformations of the spikelet lemmas. We found that the two cultivars differ in the potential of pollen dispersion for-cross-pollination and in the spikelet kinetics. We also described some anatomical traits that can have potential functional role in floret opening. None of the cultivars showed any symptoms of lemma surface deformation.ConclusionsThe cleistogamic and chasmogamic wheat cultivars differ significantly in the potential for pollen dispersion for cross-pollination, which is mainly related to anther extrusion capacity. Although none of these features differentiated the cultivars clearly, we assume, based on spikelet kinetics and the lack of lemmas surface deformation, that the water transport and turgor of cells is essential for the floret opening and anther extrusion in wheat. The search for parental ideotype should be supported by marker assisted selection, e.g. based of polymorphisms in genes related to aquaporin biosynthesis.

【 授权许可】

CC BY