TURNIP (Brassica rapa L.) FOUNDATION

     SINGLE CROSSES

I. Application and Amplification of General Seed Certification Standards

    A.    The General Seed Certification Standards are basic and together with the following specific standards

constitute the standards for certification of the seeds of  foundation single crosses of turnip.

   B.     The General Standards are amplified as follows to apply specifically to the foundation single crosses of

            turnip.

    1. Eligibility requirements for certification

    (a) A foundation single cross to be eligible for certification must be produced  by seed to seed method (in situ)

         as the inbred lines are by and large fixed for the desired attributes.

    (b) A foundation single cross to be eligible for certification must be produced from two approved inbred lines, both

         of which shall be self - incompatible but cross - compatible to each other, the sources of which shall assure their

          identity and is approved by the Certification Agency.

    2. Classes and Sources of seed

    (a) A foundation single crosses shall consist of the first generation hybrid resulting from the controlled crossing of the two

         approved self- incompatible but cross-compatible inbred lines. The foundation single crosses may be of three types depending 

         upon the procedure of seed production;

        - seeds of only female parent are harvested and certified;

        - seeds of both parents are harvested separately and certified; 

           and

        - seeds of both the parents are harvested, mixed together and certified.

    (b) The foundation single cross shall be used for production of  hybrid seed.

II. Land requirements

    Land to be used for seed production of  foundation single crosses of  turnip shall be free from volunteer plants.

III. Field Inspection

    A minimum of three inspections shall be made as follows:

    1.  the first  inspection shall be made before flowering  to check isolation, offtypess, outcrosses,

         planting ratio, and other relevant factors; 

    2. the second inspection shall be made during flowering to check isolation, offtypes and other relevant

        factors;

    3. the third inspection shall be made at maturity and prior to harvesting to check offtypes, seed borne 

        diseases and other relevant factors.

IV. Field Standards

A. General requirements

1. Isolation

    Seed fields of foundation single cross shall be isolated from the contaminants shown in column 1 of the Table 

below by the distances specified in column 2 of the said Table:

                                    Contaminants                                                            Mininmum distance (meters)

                                            1                                                                                            2

Fields of other varieties including same single cross hybrid                                                1600                                                                                

Fields of the same single cross / hybrid (code desingnation)

 not conforming to varietal purity requirements for certification

and form other species of genus 

Brassica listed below:                                                                                                      1600                   

Brassica pekinensis (Lour.) Rupr.: Chinese cabbage (heading)

Brassica chinensis L.: Chinese cabbage (non-heading).

Brassica  napus (L.) var.  napobrassica (L.) Peterm : rutabaga (swede).

Brassica juncea (L.) Czern & Coss. subsp. juncea : Indian mustard or rai 

or bangla sarson.

B. juncea var. rugosa (Roxb) : Pahadi rai

B. juncea (L)Czen. & Coss. Subsp.integrifolia (West) Thell: Vegetabl 

mustard or rai.

B. Chinensis Juslen non Duthie &Fuller: brown sarson or kali sarson. 

B.napus L.var. glauca (Roxb.) Schulz: yellow sarson or pilli sarson or sarish.

B.napus L.var. napus : laha or maghi or achara rai.

B.tournefortii Gouan: Punjabi rai or jangli rai.

B.nigra (L.) koch: true mustard or black mustard

B.alba (L.) Robenh: white mustard.

B. Specific requirements    

        Factor                                                                                              Maximum permitted (%)

Offtypes in each parent at and after flowering                                                    0.010

*Plants affected by seed borne diseases at final inspection                                 0.10

*Seed borne diseases shall be:

    Black leg: Leptosphaeria maculans (Desm.)Ces. & de Not)

    Black rot:Xanthomonas camepstris  pv.campestris (Pamm.) Dawson

        Factor                                                                                                Standards

Pure seed (minimum)                                                                                     98.0%

Inter matter (maximum)                                                                                    2.0%

Other crop seeds (maximum)                                                                         None

Weed seeds (maximum)                                                                                 None

Germination (minimum)                                                                                   70%

Moisture (maximum)                                                                                       6.0%

For vapour-proof containers (maximum)                                                         5.0%