BioQuest | Vol. 1, No. 1 (July 2017)

12

Introduction

Plant growth regulators or phytohormones are

organic substances produced naturally in higher plants,

controlling growth or other physiological functions at a

site remote from its place of production and active in

minute amounts. Plant growth regulators include

auxins, gibberellins, cytokinins, ethylene, growth

retardants and growth inhibitors.

Large number of plants are propagated by stem

cutting, leaf cutting and layering. For promoting

rooting, the commonly used hormone is IBA followed

by NAA. IBA enhances root formation on cuttings.

Cytokinins also help in quick and profuse root

formation on cutting and layers. By use of IBA, profuse

root formation is observed in cutting at pomegranate,

grape etc.

Seed Germination

Plant growth regulators are used to promote

early seed germination and improve the germination

percentage. Many seeds have natural dormancy which

can be overcome by dipping the seeds in auxins.

� GA3 @ 500 ppm solution enhances seed

germination in aonla

� Ber- 500 ppm GA

� 200 ppm GA + 5% Sucrose.

Vegetative Propagation

a. Cutting: Auxins play an important role in the

initiation of roots in cuttings.

� Guava cuttings: 5000 ppm IBA by quick dip

method

� Grape cuttings:4000 ppm IBA by quick dip

method

� Pomegranates: 2000 ppm IBA by quick dip

method

� Litchi cuttings: 3000 ppm IBA by quick dip

method

� Jamun cuttings: 5000 ppm IBA by quick dip

method

� Fig cuttings: 1000 ppm IBA by quick dip method

� Air layering-guava: 3000 ppm IBA by pasting

lanoline paste

� Air layering-pomegranate: 3000 ppm IBA by

pasting lanoline paste

� Air layering-litchi: 5000 ppm IBA by pasting

lanoline paste

� Air layering-jamun: 10000 ppm IBA by pasting

lanoline paste

� Air layering-tamarind: 4000 ppm IBA by pasting

lanoline paste

� Air layering-cashew: 500 ppm IBA by pasting

lanoline paste

Fig: Air Layering in Guava

b. Layering: Paste of auxin pasted on the operated

portion of the plant part helps in initiation of roots in

grafting and layering e.g. Air layering in Guava.

Importance of plant growth regulators on fruit nursery

Subbaiah KV1*, Raju GS

1, Nirmala TV

1, Reddy AD

1, Karuna Sree E

1, Reddy RVSK

2

1Krishi Vigyan Kendra, DrYSR Horticultural University, Andhra Pradesh, India

2Administrative Building, Dr YSR Horticultural University, Andhra Pradesh, India

*Corresponding author email: venkathort@gmail.com

BioQuest | Vol. 1, No. 1 (July 2017)

13

c. Grafting: IBA+6BA (500:500 ppm) in Bee wax

paste is useful in joining the scion on stock in many

fruit crops like Grapes, Mangoes, Sapota.

d. Budding: The treatment of IBA+6BA (500:500

ppm) in Bee wax paste is useful in bud joints in Citrus,

Roses, Ber, Jamun, etc.

e. Breaking Dormancy: Gibberellins play an important

role in breaking the dormancy of seeds of fruit crops by

loosening the seed coat to permit water inside the

embryo for germination (e.g., 500-700 ppm of GA3).

f. Hastening Rootstock Growth

� Rangpur lime seedlings: 200 ppm of GA3 at one

month interval.

� Jamberi rootstock seedlings: 200 ppm of GA3 at

one month interval.

� Aonla seedlings: 20 ppm 6-BA at one month

interval.

� Khirni and Custard apple seeds: 1000 ppm GA3

and 20-24 hours seed soaking.

Fig. A fruit nursery in Florida USA

Dr. A P J Abdul Kalam’s dream project

‘Mobile Science Lab’, now live in Bihar

Inspired by late former President A P

J Abdul Kalam, the ‘Mobile Science

Laboratory’ (MSL) vans are imparting

knowledge in science to children particularly

in rural areas of the state. The MSL van was

launched in 2010 on the suggestion of Kalam

by Manas Bihari Verma, his former colleague

in the Aeronautical Development Agency

(ADA), Bengaluru. Presently there are three

vans, equipped with physics, chemistry and

life science laboratories, moving around

schools in the rural areas of Darbhanga,

Madhubani and Patna.

Source:

https://yourstory.com/2015/07/kalam-

dream-project-bihar/

Look at the sky. We Look at the sky. We Look at the sky. We Look at the sky. We

are not alone. The are not alone. The are not alone. The are not alone. The

whole whole whole whole universe is universe is universe is universe is

friendly to us and friendly to us and friendly to us and friendly to us and

conspires only to give conspires only to give conspires only to give conspires only to give

the best to those who the best to those who the best to those who the best to those who

dream and work.dream and work.dream and work.dream and work.

-------x--------