strong. One reason for trait variability in seed-produced cultivars could be the inbreeding barriers that exist in Echinacea germplasm ( Ault, 2006 ). Although poorly understood in Echinacea , one such barrier is assumed to be self-incompatibility (SI
adequate cropping ( Waite, 1894 ). Self-fertilization in pear is prevented by a gametophytic self-incompatibility system ( de Nettancourt, 2001 ) and pear cultivars are generally considered self-incompatible ( Crane and Lewis, 1942 ; Sanzol and Herrero
-sterility mainly occurs as a result of self-incompatibility (SI) and EID ( Sage et al., 2006 ). Three types of SI occur in flowering plants: homomorphic sporophytic SI, homomorphic gametophytic SI, and heteromorphic SI ( Gibbs, 2014 ). In sporophytic SI, the
Low seed set has been reported following self-pollinations of flowering dogwood (Cornus florida L.). The objective of this study was to verify the presence of self-incompatibility in C. florida. `Cherokee Princess' stigmas and styles were collected 1, 2, 4, 8, 12, 24, 48, and 72 hours after cross- and self-pollinations, stained with aniline blue and observed using a fluorescence microscope. Pollen germinated freely following self-pollinations, but self-pollen tubes grew slower than those resulting from cross-pollinations. By 48 hours after cross-pollination, pollen tubes had reached the bottom of the style while pollen tubes in self-pollinated flowers had only penetrated the upper third of the style. Evidence of reduced pollen tube growth rate in self-pollinations of `Cherokee Chief' and `Cherokee Brave' was also obtained. This study provides evidence of a gametophytic self-incompatibity system in C. florida. It was also determined that stigmas of C. florida `Cherokee Princess' are receptive to pollen from 1 day prior to anthesis to 1 day after anthesis.
( Vaccinium angustifolium ), and hexaploid rabbiteye blueberry [ Vaccinium ashei ( Rowland et al., 2012 )]. Most cultivars are self-incompatible ( Chavez and Lyrene, 2009 ; Ehlenfeldt and Kramer, 2012 ; Miller et al., 2011 ; Yang et al., 2017 ). Self-incompatibility
Self-incompatibility is a genetic mechanism that exists in flowering plants to prevent a plant from being pollinated by its own pollen and to promote cross-pollination. Gametophytic SI (GSI), one form of SI, has been extensively studied and S
Abstract
Seven self-incompatibility (S) alleles (S2, S13, S15, S18, S24, S39 , and S51 ) were identified in various hybrids and breeding lines of broccoli [Brassica oleracea L. (Botrytis group)]. The international S. allele collection of Brassica oleracea at the National Vegetable Research Station was used to assure standardized identification.
Self-incompatibility in angiosperms is known as a mechanism for preventing self-fertilization and promoting outcross pollination by arresting pollen tube growth. One of the SI systems, RNase-mediated gametophytic SI (GSI), is based on the
Self-incompatibility was investigated in sour cherry (Prunus cerasus L.) by examining pollen growth in the pistil by use of ultraviolet fluorescence microscopy following self- and cross-pollination. The sour cherry cultivars Tschernokorka and Crisana exhibit pollen tube inhibition in the style characteristic of gametophytic self-incompatibility. `Meteor' and `Montmorency' appear to be partially self-incompatible, with few self-pollen tubes reaching the ovary. Several hybrid seedlings from crosses between self-compatible cultivars were self-incompatible, suggesting that these self-compatible parental cultivars carry self-incompatibility alleles.
maintain heredity and variation ( Fujii et al. 2016 ; Wu et al. 2018 ). Collectively, these mechanisms are referred to as self-incompatibility (SI), which ensures plant populations’ survival in a complex and changeable environment ( Wu et al. 2018 ). In