Tammin subterranean clover

Page last updated: Wednesday, 24 July 2019 - 3:36pm

Tammin is a more persistent early flowering variety for cropping rotations in low-medium rainfall (300-450 mm annual average rainfall) areas with the novel traits of seedling resistance to redlegged earth mites (RLEM) and much higher hardseededness than other cultivars.

It results from a five-year joint venture between the Department of Primary Industries and Regional Development (DPIRD) and pasture seed company, Seed Force.

Origin

Tammin is derived from a complex cross involving the variety Dalkeith, three naturalised strains collected in WA and a wild plant collected in Sicily with RLEM seedling resistance. It was the most productive and persistent of 18 early flowering breeding lines and six commercial varieties in trials in WA at Tammin and Katanning (two trials) and two sites in eastern Australia.

Varietal characters

Tammin flowers approximately 88 days from an early May sowing in Perth (Table 1). It has only trace levels of the oestrogenic compound, formononetin, and will not cause infertility problems in ewes. Tammin suffers markedly less RLEM cotyledon damage than other early flowering varieties. Tammin is also considerably more hardseeded than other varieties, resulting in greater persistence in crop rotations. Table 1 shows the proportion of seed set remaining as hard seeds in May following placement on the soil surface in Perth. Hard seed breakdown over four summers on the soil surface is shown in Figure 1. After four summers Tammin still had 7.7% of its original seed as hard seeds, while all other cultivars had <1% still hard after only three summers.

Table 1 Characteristics of Tammin and other early flowering varieties

Variety

Flowering time

Formononetin

RLEM damage

Hardseededness

 

(days from sowing in Perth)

(% of dry matter)

(% cotyledon silvering)

(% hard seeds in May after 5 months on the soil surface)

Tammin

88

0.0

6.1

51.3

Dalkeith

96

0.0

39.2

16.3

Geraldton

88

1.1

40.8

20.3

Izmir

80

0.1

27.9

21.7

Losa

95

0.1

28.3

9.3

Nungarin

77

0.1

32.9

23.7

Urana

105

0.0

25.4

24.3

 

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Figure 1 Hard seed breakdown over four summers (from 1 December 2012 until 1 June 2016) in the field at Perth of Tammin and other early flowering cultivars

Field performance

Across all sites and years Tammin had 7% higher autumn biomass than Dalkeith, 2% higher winter biomass, 17% higher spring biomass, similar seed yields in the year of sowing and maintained a 31% higher seed bank density in subsequent summer-autumn periods.

The real advantage of the higher hardseededness of Tammin was apparent in the Tammin and Katanning trials, which were cropped in the second year. Across both sites, Tammin retained 48% more seeds in the seed bank during the crop phase than Dalkeith, which resulted in a 34% higher seedling regeneration density, 9% more winter biomass and 56% more spring biomass (Figure 2).

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Figure 2 Mean field performance of Tammin and other early flowering varieties (expressed as a percentage of Dalkeith) following a crop in Year 2 at Tammin and Katanning

Seed availability and PBR status

Seed of Tammin can be purchased through Seed Force agencies.

Tammin is protected under the Plant Breeders Rights Act 1994. Under the Act sale of Tammin seed can only be carried out by agreement with the licensee, Seed Force Pty Ltd. However, this does not restrict sale of produce, such as hay or silage, provided seed was legally purchased.

For seed sales information visit seedforce.com.au

Seed Force

Contact information

Paul Sanford
+61 (0)8 9892 8475

Author

Phil Nichols

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