ISTA PURITY COMMITTEE. Jane Taylor & Gerarda de Boer-Raatgever

Transcription

1 ISTA PURITY COMMITTEE Jane Taylor & Gerarda de Boer-Raatgever

2 Topics 1. Committee changes 2. Rules proposals 3. Universal List - digital images 4. Questions to the purity committee 5. Introduction to the new Chair 2

3 Purity committee members CHAIR: Jane Taylor United Kingdom 2 VICE-CHAIR: Gerarda de Boer Netherlands 3 Myriam Alvisi Brazil 4 Pernilla Andersson Sweden 5 Karima Boudehri-Giresse France 6 Maria Duter New Zealand 7 Adriel Garay US 8 Charan Jeet Mehta India 9 Andrea Jonitz Germany 10 Augusto Martinelli Argentina 11 Deborah Meyer US 12 Kepha Oganda Kenya 13 Dot Vittrup Pedersen Denmark 14 Zita Ripka Hungary 15 Ruojing Wang Canada 3

4 My thanks to the members of the purity committee for their discussions, help, support and patience. 4

5 Purity committee members Changes to the committee Leaving: Adriel Garay retired Dec 2015 Pernilla Andersson member Jane Taylor will retire June 2016 Proposed new members to be approved by the ECOM (June 2016) Carrie Lewis US Selma Kurt Turkey One vacancy interested persons should submit their application to ISTA and the purity committee for their consideration ASAP for TCOM voting and ECOM approval (NOV 2016). ISTA Forms: 5

6 Purity committee members CHAIR: Gerarda de Boer-Raatgever Netherlands 2 VICE-CHAIR: Ruojing Wang Canada 3 Myriam Alvisi Brazil 4 Karima Boudehri-Giresse France 5 Maria Duter New Zealand 6 Charan Jeet Mehta India 7 Andrea Jonitz Germany 8 Carrie Lewis US 9 Selma Kurt Turkey 10 Augusto Martinelli Argentina 11 Deborah Meyer US 12 Kepha Oganda Kenya 13 Dot Vittrup Pedersen Denmark 14 Zita Ripka Hungary 15 6

7 Rules proposals-voting 2016 B.1.1 New species Carica papaya L. C.3.1 Improved guidance in Other seeds C.3.2 Amendment to PSD 10 C.3.3 Move Hedysarum from PSD 11 to PSD23 C Reporting results in 4.7 7

8 Rules proposals-voting 2016 B New species Carica papaya L. Table 2, Part 2: tree and shrub seeds Minimum purity working sample weight = 50g PSD = 10 & classified as Chaffy (see ISTA 3.6.6) Sample preparation Because of the soft seed coat it is recommended that the seed should not be passed through a mechanical divider such as a Centrifugal divider because of the possibility of damaged being caused to the seed and that a riffle (soil divider) be used instead. U.S. National Seed Herbarium image 8

9 Rules proposals-voting 2016 C.3.1 Improved guidance in Other seeds 4. For schizocarps with two or more seeds, the individual seeds (mericarps) contained in a schizocarp are to be counted separately. 9

10 Schizocarps, PSD 15 & Other Seed Classification 1. Where a species is not covered by an ISTA PSD e.g. Aethusa, Ammi, Chaerophyllum 5 schizocarps = would be reported as 10 seeds 2. Where a species is covered by an ISTA PSD e.g. PSD15: Anthriscus, Cuminum, Daucus, 5 schizocarps = would be reported as 5 seeds Schizocarp NIAB NIAB NIAB Aethusa cynapium Anthriscus caucalis Daucus carota 10

11 Rules proposals-voting 2016 C.3.2 Amendment to PSD 10 ISTA PSD 10 = Seed, with or without testa Piece of seed larger than one half, with or without testa New wording: Allium: Pairs of Allium seeds adhering together do not need to be separated 11

12 Rules proposals-voting 2016 C.3.2 Amendment to PSD 10 The fruit of Allium is a dry dehiscent capsule containing three chambers, usually with two ovules per chamber. At maturity the pairs of seeds in each chamber may adhere together. While most Allium seed pairs separate naturally during seed conditioning, some do not. Attempting to separate the adhering seeds could cause mechanical damage and may affect the purity and germination results. In the AOSA rules, the Pure Seed Unit (PSU is described as: Pairs of Allium spp. adhering together need not be separated 12

13 Rules proposals-voting 2016 C.3.3 Move Hedysarum from PSD 11 to PSD23 A change of PSD from PSD11 to PSD 23 is proposed as new varieties of Hedysarum currently being developed are of a soft seeded variety that does not require the seed to be removed from the pod (for scarification). Upon harvest or cleaning the pods break into single pod units. The current PSD 11 does not allow for pod material, under the current PSD 11 all seed should be taken out of the pericarp. 13

14 Rules proposals-voting 2016 C.3.3 Move Hedysarum from PSD 11 to PSD23 There is currently an anomaly with the submitted sample weights in chapter 2 in that there are different submitted sample weights for fruits (300g) and samples submitted as fruit under the current PSD11 would be required to be removed from the pods (fruit) By moving Hedysarum to PSD 23 this contradiction would be removed The classification was also changed to Chaffy to cover the fruits 14

15 Rules proposals-voting 2016 C.3.3 Move Hedysarum from PSD 11 to PSD23 One-seeded segment of pod or siliqua, with or without stalk or terminal beak, unless it is obvious that no seed is present. Seed, provided a portion of the testa is attached. Piece of seed larger than one-half the original size, provided a portion of the testa is attached. 15

16 Rules proposals-voting 2016 C. 4.1 Reporting results in 4.7 If approved a consequential change in Chapter 1, also needed. Current version 4.7 Reporting results - The scientific name and number of seeds of each species sought and found in this weight. Proposed version 4.7 Reporting results - The scientific name and number of seeds of each species sought and found in this weight. If no other seeds are found, this must be indicated on the certificate. The laboratory can decide on the wording to be used. 16

17 Rules proposals-voting 2016 C. 4.1 Reporting results in 4.7 Examples for reporting: Other plant species in XXXg (Complete test) NIL Designated Other plant species in XXXg (Limited test) Avena spp. = NIL Cuscuta spp. = NIL Rumex spp. = NIL 17

18 Rules proposals-voting 2016 C.3.2 Amendment to PSD 10 ISTA PSD 10 = Seed, with or without testa Piece of seed larger than one half, with or without testa New wording: Allium: Pairs of Allium seeds adhering together do not need to be separated 18

19 A Rules proposal for 2017 Chenopodium quinoa L. Chenopodium The purity committee have already completed and agreed the purity part to add this species to the rules. Recommended submitted working sample weights are: 100g Submitted sample 10g Purity Chenopodiaceae PSD 2 Not chaffy 100g Other Seed Determination Statistical analysis of the germination data to be finalised. 19

20 Universal List Digital Images versallistofspecies2014.pdf 50 % are uploaded Another 32 species (group 2) are checked and ready to send to ISTA 20

21 Questions to purity committee May 2015 May 2016 Subject Date Country 1 Reporting of tests results not covered by Labs accreditation scope May 2015 EG Scientific basis/ history on half-seed ruling. 2 Unknown seeds? images received for identification Jun 2015 UK 3 Unknown seeds? images received for identification Jun 2015 UG 4 Seed or inert matter? images received for identification Jun 2015 FR 5 Seed Identification? Contamination of Setaria lutescens (S. pumila)? Jun 2015 NZ 6 Weight of the submitted sample - preparation of the working samples Jun 2015 RS 7 ISTA Rules Proposal? - Section and 4.7 reporting of a NIL result for other Aug 2015 US/ ISTA seeds Determination 8 Coriandrum sativum Query re TSW and working sample weights Aug 2015 IR 9 Pelleted seed, verification of species, Pure Seed from the purity test or germination test? Sep 2015 How to report Sclerotia, soil when carried out on the other seed determination weight 10 Question on new methods for TSW and automation of TSW during seed production Sep 2015 Via ISTA 11 Impurities with an undue effect (re ) Sep 2015 DE ISTA 21

22 Questions to purity committee Subject Date Country 12 TSW of Camelina sativa and Avena strigosa Sep 2015 DE 13 Application of PSD 21, re seeds in pods or not Sep 2015 ISTA 14 Seed Identification on Brachiaria Oct 2015 MX 15 Reporting of the purity test on coated seed and de-pelleted seed Oct 2015 AR 16 The weight of the working sample or the weight of the components? When reporting a purity test where the weight exceeds by 10% the weight specified in Table 2.A The process for sample preparation of the working samples for purity and other seed determination. Oct Weighing of the pure seed and impurity fractions to the same number of decimal places according to Table Dec 2015 LT 18 Testing of Mixtures and separation of components when the components are Jan 2016 US Festuca rubra and F. ovina 19 Verification of species pelleted seed and removal of the pelleting material. Jan 2016 AR 20 Testing Triticum spelta for TSW, query re the ears and how to proceed when the CV exceeds 6. Feb 2016 PL 21 ISTA Rule Impurities with an undue effect, further discussion by Purity Com. Feb 2016 DE AU 22 Reporting of the botanical name on the ISTA certificate, Genus only or Genus and species Feb 2016 AR 22

23 Questions to purity committee Subject Date Country 23 Discussion relating to chapter 18 re mixture testing and species that can be tested. Feb 2016 ISTA 24 Clarification on the reporting of Avena fatua multiple units and the number of seeds Feb 2016 PL & Avena sativa multiple seed units when found as other seeds 25 Seed identification query, confirmed as Tribulus terrestris Mar 2016 UG 26 Clarification on application of PSD 10 for Physalis regarding small and deformed seeds = pure seed? Stone cells = inert matter 27 Query re encrusted seeds when 2 seeds are attached together due to the treatment, is it 1 or 2 pellets when prepping seed for the germination test? Pelleted seed, Verification of species test, are empty florets of the species under test included in the total of seeds reported? How to report the results of the other seed determination test when a Reduced Limited test has been carried out on part of the search weight (ISTA rules 4.5.1b) for a specified species and for all other plant species excluding the specified species in the full search weight (i.e. a limited test) 28 How to report seed sample contamination with rodent or insect feces under the inert matter. What terminology to use? Mar 2016 JP Apr 2016 AR Apr 2016 US Are small stones classified separately from soil? 29 Tolerances tables in relation to seed count (seeds per pound or seeds per kilogram) Apr 2016 US 30 Species needed by an ISTA accredited laboratory for a Seed Reference Collection May2016 TH 23

24 Introduction of new chairperson Gerarda de Boer-Raatgever 24

25 Who is Gerarda? My career in seed testing: Started 28 years ago at the Governmental Seed Testing Station in Wageningen Hands on analyst a lot of practical experience Now the QA expert seed testing at NAK in the Netherlands Technical responsible for Moisture, Seed Cleaning, Purity, Germination and Seed Health tests 25

26 NAK Located in the North of The Netherlands 26

27 NAK 27

28 ISTA accredited 28

29 Trained analyst QA knowledge Internal and external auditor in NL ISTA technical auditor Member of the purity and moisture committee for many years Workgroup leader of the blowing working group 29

30 Supported by: My husband Jan My manager and staff at NAK The members of the purity committee 30

31 Mission purity committee Provide purity analysts with clear ISTA rules Provide knowledge Provide training Follow new developments 31

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