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Important Tables

Seed Technology - Important Points & Tables

Milestones in Seed Technology

1

National seed corporation of India was established in 1963

2

Seed Act was enacted during 1966

3

National seed project was launched during 1976

4

Implementation of the new policy for seed development in 1988

5

National seed project (NSP) III launched in March 1990

6

Total Number of state seed corporation present in India is 13

7

New seed policy was introduced in 1988

8

Grow more food enquiry committee constituted during 1952

9

Seed rules was came into force during 1968

10

Seed control order was passed during 1983

11

World seed day started during 1961

Crop

Test Weight / Seed Index

Rice

20-30 g

Wheat

36-50 g

Barley

35-40 g

Pearlmillet

5-9 g

Grain Sorghum

25-30 g

Finger millet

1.0 – 4.5 g

Chickpea(Desi)

140-259 g

Chickpea (Kabuli)

260–450 g

Pigeonpea

45-105 g

Lentil

17-38 g

Blackgram

36-49 g

Greengram

20-70 g

Soybean

80-150g

Cowpea

100-250 g

Horsegram

25-41 g

Groundnut

200-250 g

Rapeseed and mustard

3-5 g

Sunflower

40-50 g

Safflower

10-70 g

Castor

100-150 g

Linseed

4-8 g

Sesame

2.85-4.06 g

Niger

3-5 g

Tobacco

0.05-0.12 g

Cotton (Seed Index or 100 seed weight)

7-10 g

Isolation distance for different crops

Crop

Isolation distance

Foundation seed

Registered seed

Certified seed

Rice, wheat, barley, oats, groundnut, soybean, cowpea

Fields should be separated by a definite boundary

-

-

Cotton (Upland type)

30 m from cultivars which differ markedly

-

-

Cotton (Egyptian type)

400 m

400 m

200 m

Tomato

60 m

30 m

9 m

Millets

400 m

400 m

200 m

Onion

1600 m

800 m

400 m

Grasses

273 m

91 m

50 m

Dormancy Breaking Method

Sl. No.

Crop

Methods used

1

Mustard

Pre chilling for 3-10 days at 0 – 5 ºC

2

Rice

Pre heating at 40 – 50 ºC

3

Tomato

KNO3 treatment

4

Lettuce

Pre chilling with thiourea

5

Bitter guard

Piercing with needle

6

Cotton

Soaking in conc. H2SO4 for 20 – 30 min.

7

Rubber

Seed coat removing

8

Lentil

Hot water treatment

9

Apple

Cold stratification

Seed Moisture content v/s Storage life

Sl. No.

Seed moisture content

Storage life

1

11 – 13 %

½ year

2

10 – 12 %

One year

3

9 – 11 %

Two year

4

8 – 10 %

Four year

Methods of Seed Treatment

Sl. No.

Methods

Examples

1

Physical

Seed coat removing, Scarification, Delinting in cotton

2

Chemical

Insecticide, Fungicide

3

Biological

Trichoderma, Azospirillum, Azotobacter, Rhizobium

Memorizing technique: Order of seed treatment

i.e., FIR – Fungicide, Insecticide, Rhizobium (Biological)

Seed certificate and their tag colors

Sl. No.

Certified for

Tag color

1

Seed weight

Orange / Green

2

Seed sample

Blue

3

Breeder seed

Golden yellow

4

Foundation seed

White

5

Certified seed

Blue

6

Nucleus seed

Buff

7

Truthful labelled seed

Opel green

Flowering types

1

Basipetal – Flowering from top to bottom. Ex. Rice

2

Acropetal – Flowering from bottom to top. Ex. Gingelly

3

Centripetal – Flowering from centre to both sides. Ex. Pearl millet

Minimum genetic purity of different classes of seeds

Classes of seeds

Minimum genetic purity (%)

Foundation seed

99.00 %

Certified :

Varieties

Composites

Synthetics

Multi-lines

98.00 %

Hybrids

95.00 %

Sl. No.

Types

Examples

1

Autogamous oil seed

Ground Nut

2

Allogamous oil seed

Sunflower

3

Alloautogamous oil seed

Sesame

4

Autogamous cereal

Rice

5

Allogamous cereal

Maize

6

Alloautogamous cereal

Sorghum

7

Autogamous pulse

Green gram

8

Alloautogamous pulse

Pigeonpea

Chemicals used for Seed Processing

Chemicals / Elements

Role

Sulphuric acid

Cotton delinting

Gametocydes

Induce production of female flowers

Maleic hydrazide

Arrests the potato sprouting

Boron 

Involved in pollen grain germination

Sodium alginate

Used for enclosing the synthetic seed

Ethylene

Accumulation of ethylene leads to ecological suicide of the crop seeds at field conditions

KH2PO4

Mid storage correction

KCl

Used for seed hardening

Endospermous and Non endospermous seeds with examples

Sl. No.

Seed category

Examples

1

Endospermous monocotyledonous seeds

Maize, Wheat, Rice, Barley, Onion

2

Endospermous dicotyledonous seeds

Castor, Coffee, Cotton

3

Non endospermous monocotyledonous

Pothos sp., Vallisanaria sp.

4

Non endospermous dicotyledonous

Pea, Bean, Gram, Mango, Mustard, Jack fruit, Sunflower

Must Know this

1

First private seed company came into existence during the year 1912

2

First private seed company started in Kolkata

3

First private seed company was – Sutton & Sons

4

First seed testing laboratory was established at IARI in 1961

5

The first symbolic importance of seed started after the report of famine commission in 1881

Different methodologies and terms you come across in Seed technology

1

Accelerated aging test was developed by Delouche & Baskin during 1942

2

Positive correlation between Tetrazolium staining with seed quality in Soybean seeds was showed by Burries in 1969

3

Grow out test helps to determine genetic purity of seeds

4

The close relationship between the viability of the aleurone layer and the seedling emergence from the maize seed was shown by Germ and Kietreiber

5

The use of Tetrazolium staining technique for assessing seed quality was described by Moore in 1973

6

The use of linear measurement of plumula growth as a vigour test was first suggested by Germ in 1949

7

International crop improvement association (ICIA) in 1946, classified seeds into different categories

8

Seed moisture can be controlled by – Ventilation, Moisture proofing, Dehumidification, Sealed containers, Desicants

9

The process of evaluation of seeds in terms of purity and germination is called Seed testing

10

Hand book of seed testing was published in 1876

11

Formula for mean germination time is given by Nicolls and Heydecker in 1962

12

Foundation of international seed testing association (ISTA) led during 1924

13

Primary objective of ISTA includes - to develop, adopt and publish standard procedures for sampling and testing seeds.

14

Seeds which do not absorb water are referred as Hard seeds

15

Process of removal of off plants from the field of an improved variety is known as Roguging

16

Association of official seed analysts (AOSA) was started during 1908

17

Primary objective of AOSA is to develop, Adopt and publish rules for testing seeds and to encourage research in seed technology

18

Society of commercial seed technologists (SCST) was established in 1922

19

Small integument outgrowth of seed is called Hairs

20

Pulse proteins are deficient in Methionine

21

Major transportable form of amino acids in peas is Hemoserine

22

Energy mobilization in seeds is enhanced by the enzyme Lyases

23

Enzyme synthesis in germinating seeds is controlled by Gibberlins

24

Epithelium layer of scutellum of rice is the source for α and β amylase

25

Calvin cycle enzymes in castor is found in Chloroplast

26

Reduced germination of Onion is due to Mn deficiency

27

Pollination by animals is called as Zoophyllous

28

Foundation seeds usually has 98 % purity in majority of seeds

29

The seed that does not meant for general distribution to the farmers for commercial cultivation is Breeder seed

30

Certification is does not required for Breeder seeds

31

Grow out test is carried out to determine Genetic Purity

32

Major transportable form of amino acids in legumes is Asparagine

33

Major transportable form of amino acids in castor is Glutamine

34

Protein present in the peanut is Arachin and Conarachin

35

Protein present in soybean is Glycine

36

Protein present in Hemp is Glaiden

37

Protein present in peas is Vicilin

38

Storage protein present in wheat is Glutelin

39

Storage protein present in paddy is Albumin

40

Seedlings which are unable to develop into normal plants are called Abnormal seedlings

41

Cross pollinated species are highly Heterzygous and Heterogenous

42

Storage protein present in barley is Hordein

43

Pollen viability of cotton flower is 24 hours

44

Axis in lettuce play a major role in β mannanase synthesis

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