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Variation in seed germination and early growth between and within acetolactate synthase herbicide resistant and susceptible Lolium rigidum accessions

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Differences in fitness (seed germinability and early growth) between ACCase herbicide resistant and herbicide susceptible biotypes of Lolium rigidum, were analysed. Five accessions were used: two herbicide susceptible biotypes (S1 and S2), two herbicide resistant biotypes (R1 and R2) and the fifth one (RB) composed of only basal seeds of the inflorescence of accession R2. Germination percentages, germination index (GI), coefficient of velocity (CV), coleoptile length and radicle length were estimated in controlled conditions in Petri dishes in germination chambers (12/24°C). Seedling emergence and early growth were also monitored outdoors in experimental pots. S biotypes showed similar germination percentages to R biotypes (92%) and similar coleoptile length at Zadocks 09 (9 mm), but slower germination (greater values of GI and lower values of CV) were observed. The basal seeds RB showed significant differences in percentage of germination (79%), coleoptile length (11 mm) and slower germination (greater GI and lower CV values) than seeds R2. Concerning the outdoor trial, no differences were observed in percentage of emergence and also in leaf and tiller appearance when comparing fitted Weibull curves of S and R biotypes. In contrast, significant differences between R2 and accession RB were recorded indicating slower plant development for the basal seeds (RB) than seeds from the rest of the inflorescence. Minor or no differences in fitness were observed between S and R biotypes; however, environmental factors as seed position in the spike have a relevant influence.
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Document Type: Research Article

Publication date: April 1, 2007

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