Abstract
<span>The European globeflower was shown to be highly self‐incompatible by flower bagging experiments, however, a very small degree of selfing was observed in natural populations. The present study is an attempt to evaluate the level of self-incompatibility (SI) in three <em>Trollius europaeus</em> populations from different sites of Poland and to assess a degree of cross-compatibility (CC) between these populations. The SI and CC of the globeflower populations were evaluated based on the pollen germination index (PGI). The observations of pollen grains germination and pollen tubes penetration were made in pistils after self- and diallel cross-pollination of globeflower plants. The pollination combinations which had the PGI equal or higher than 2 were regarded as compatible. Generally, the PGI after self-pollination of all globeflower population was over 2, indicating that they are self-compatible. Also, in two globeflower populations after cross-pollination the PGI was higher than 2 showing that there was cross-compatibility between plants of these two populations. However, the third population, from Biedrusko, was fully cross-incompatible.</span>
Highlights
According to East [1], the number of self-incompatible species among flowering plants is amounted to at least 3000
Gametophytic self-incompatibility system exists in the Ranunculaceae family and from data received by Lundqvist et al [8] it is suggested that three or even four S-loci are governing self-incompatibility
The plant material used for this study consisted of pistils after self- and diallel cross-pollination of globeflower (Trollius europaeus L. ssp. europaeus) plants from three populations located in Greater Poland, i.e., Biedrusko (B), Łobżenica (Ł), and Uścikowo (U) (Fig. 1, Tab. 1)
Summary
According to East [1], the number of self-incompatible species among flowering plants is amounted to at least 3000. This number was confirmed by Brewbaker [2]. Based on his observations concerning 600 genera, he concluded that self-incompatibility was present in 71 families from over 250 genera. Some data existing in the literature [3,4,5] suggest that seeds of globeflower are set mostly by cross-pollination, but under some environmental conditions, e.g., long-lasting wet weather, the seeds can be formed by self-pollination [6,7]. Gametophytic self-incompatibility system exists in the Ranunculaceae family and from data received by Lundqvist et al [8] it is suggested that three or even four S-loci are governing self-incompatibility
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