White Paper: Perspective on Creeping Bentgrass, Agrostis stolonifera L.

MacBryde, Bruce

doi:10.13140/rg.2.2.35537.33124

Cited by 1 publication

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“…Naturally occurring intraspecific, interspecific, and intergeneric (most commonly with Polypogon ssp.) hybrids have been identified (MacBryde 2006). Some of the hybrids are sufficiently common to have been given a scientific name; for example, the hybrid A.…”

Section: Creeping Bentgrass Reproductive Biologymentioning

confidence: 99%

Transfer of resistance alleles from herbicide-resistant to susceptible grass weeds via pollen-mediated gene flow

et al. 2021

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The objective of this paper was to review the reproductive biology, herbicide-resistant (HR) biotypes, pollen-mediated gene flow (PMGF), and potential for transfer of alleles from HR to susceptible grass weeds including barnyardgrass, creeping bentgrass, Italian ryegrass, johnsongrass, rigid (annual) ryegrass, and wild oats. The widespread occurrence of HR grass weeds is at least partly due to PMGF, particularly in obligate outcrossing species such as rigid ryegrass. Creeping bentgrass, a wind-pollinated turfgrass species, can efficiently disseminate herbicide resistance alleles via PMGF and movement of seeds and stolons. The genus Agrostis contains about 200 species, many of which are sexually compatible and produce naturally occurring hybrids as well as producing hybrids with species in the genus Polypogon. The self-incompatibility, extremely high outcrossing rate, and wind pollination in Italian ryegrass clearly point to PMGF as a major mechanism by which herbicide resistance alleles can spread across agricultural landscapes, resulting in abundant genetic variation within populations and low genetic differentiation among populations. Italian ryegrass can readily hybridize with perennial ryegrass and rigid ryegrass due to their similarity in chromosome numbers (2n=14), resulting in interspecific gene exchange. Johnsongrass, barnyardgrass, and wild oats are self-pollinated species, so the potential for PMGF is relatively low and limited to short distances; however, seeds can easily shatter upon maturity before crop harvest, leading to wider dispersal. The occurrence of PMGF in reviewed grass weed species, even at a low rate is greater than that of spontaneous mutations conferring herbicide resistance in weeds and thus can contribute to the spread of herbicide resistance alleles. This review indicates that the transfer of herbicide resistance alleles occurs under field conditions at varying levels depending on the grass weed species.

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Section: Creeping Bentgrass Reproductive Biologymentioning

confidence: 99%