‘Grasslands Coronet’ perennial ryegrass (Lolium perenneL.)—a dwarf ryegrass bred for sports fields

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Abstract
‘Grasslands Coronet’ is a 28-parent synthetic. It originates from a pool of 1650 dwarf-type ryegrass plants collected from (a) high wear sites through New Zealand; (b) seed increase fields of the pasture cultivars Ruanui and Nui; and (c) overseas cultivars of turf ryegrass. During 1974–76, these plants (duplicated) were grown at 5 cm spacings under close and frequent defoliation, and screened for density, rate of spread, leaf shortness, dark colour, and disease resistance. After the first year, cores were removed from the 430 most promising genotypes, planted in a separate replicated block at 60 cm spacings, and screened for amount and timing of seedhead production. Before flowering, ramets were removed from some of these selected genotypes and inter-pollinated. The seed was used for a progeny test as sown mini-swards. Before flowering in 1976, the final selection of 28 parent geotypes was made from the spaced-plant block. A polycross isolation was made and the seed harvested was bulked and entered into official trials under the name ‘Grasslands Fine’.

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