STUDIES ON COMBINING ABILITY AND HETEROSIS FOR YIELD AND YIELD COMPONENTS ...

126 Pages·2016·2.88 MB·English

STUDIES ON COMBINING ABILITY AND
HETEROSIS FOR YIELD AND YIELD
COMPONENTS THROUGH LINE X
TESTER ANALYSIS IN MAIZE
(Zea mays L.)

K. SRAVANTI
B.Sc. (Ag.)

MASTER OF SCIENCE IN AGRICULTURE

(GENETICS AND PLANT BREEDING)

2014
STUDIES ON COMBINING ABILITY
AND HETEROSIS FOR YIELD AND
YIELD COMPONENTS THROUGH
LINE X TESTER ANALYSIS IN
MAIZE (Zea mays L.)

BY

K. SRAVANTI

B.Sc. (Ag.)

THESIS SUBMITTED TO THE ACHARYA N. G. RANGA
AGRICULTURAL UNIVERSITY IN PARTIAL FULFILMENT OF
THE REQUIREMENTS FOR THE AWARD OF THE
DEGREE OF

MASTER OF SCIENCE IN AGRICULTURE

(GENETICS AND PLANT BREEDING)

CHAIRPERSON: Dr. I. SWARNALATHA DEVI

DEPARTMENT OF GENETICS AND PLANT BREEDING
COLLEGE OF AGRICULTURE
RAJENDRANAGAR, HYDERABAD-500 030
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY
2014
DECLARATION

I, K. SRAVANTI, hereby declare that the thesis entitled “STUDIES ON
COMBINING ABILITY AND HETEROSIS FOR YIELD AND YIELD
COMPONENTS THROUGH LINE X TESTER ANALYSIS IN MAIZE (Zea mays
L.)” submitted to the Acharya N.G. Ranga Agricultural University for the degree of
Master of Science in Agriculture is the result of original research work done by me. I also
declare that no material contained in the thesis has been published earlier in any manner.

Place: Hyderabad (K. SRAVANTI)
Date: I.D. No. RAM/2012-48
CERTIFICATE

Ms. K. SRAVANTI has satisfactorily prosecuted the course of research and that
the thesis entitled “STUDIES ON COMBINING ABILITY AND HETEROSIS FOR
YIELD AND YIELD COMPONENTS THROUGH LINE X TESTER ANALYSIS IN
MAIZE (Zea mays L.)” submitted is the result of original research work and is of
sufficiently high standard to warrant its presentation to the examination. I also certify that
neither the thesis nor its part thereof has been previously submitted by her for a degree of
any University.

Date: ( I. SWARNALATHA DEVI)
Chairperson
CERTIFICATE

This is to certify that the thesis entitled “STUDIES ON COMBINING ABILITY
AND HETEROSIS FOR YIELD AND YIELD COMPONENTS THROUGH LINE X
TESTER ANALYSIS IN MAIZE (Zea mays L.)” submitted in partial fulfilment of the
requirements for the degree of Master of Science in Agriculture of the Acharya N.G. Ranga
Agricultural University, Hyderabad is a record of the bonafide original research work carried
out by Ms. K. SRAVANTI under our guidance and supervision.
No part of the thesis has been submitted by the student for any other degree or
diploma. The published part and all assistance and help received during the course of the
investigations have been duly acknowledged by the author of the thesis.

Thesis approved by the Student Advisory Committee

Chairperson : Dr. I. SWARNALATHA DEVI -----------------------------
Senior Scientist,
Plant Breeding,
SRTC, Rajendranagar,
Hyderabad -500 030.

Member : Dr. M. R. SUDARSHAN -----------------------------
Principal Scientist,
Plant Breeding,
Maize Research Centre, Rajendranagar,
Hyderabad.-500 030.

Member : Dr. K. SUPRIYA -----------------------------
Assistant Professor,
Dept. of Statistics & Mathematics,
College of Agriculture,
Rajendranagar, Hyderabad-500 030.
Date of final viva- voce:
ACKNOWLEDGEMENTS
First and foremost, I offer my obeisance to Lord ‘Sai Baba’ for his boundless
blessing, which accompanied me in all the endeavours.
I am pleased to place my profound etiquette to Dr. I. Swarnalatha Devi, Senior
Scientist, Plant Breeding, Seed Research and Technology Centre, Rajendranagar,
Hyderabad and esteemed Chairman of my Advisory Committee for her learned counsel,
unstinted attention, arduous and meticulous guidance on the work in all stages. Her
keen interest, patient hearing and constructive criticism have installed in me the spirit
of confidence to successfully complete the task.
I deem it my privilege in expressing my fidelity to Dr. M. R. Sudarshan, Principal
Scientist, Plant Breeding, Maize Research Centre, Rajendranagar, Hyderabad and
member of my Advisory Committee for his munificent acquiescence and meticulous
reasoning to refine this thesis and most explicitly to reckon with set standards. Ineffable
in my gratitude and sincere thanks to him for his transcendent suggestions and efforts to
embellish the study.
I sincerely extend my profound gratitude and appreciation to the member of my
advisory committee to Dr. K. Supriya, Assistant Professor, Department of Statistics &
Mathematics, College of Agriculture, Rajendranagar, Hyderabad, for her valuable help
and cooperation during the course of my study.
I feel a great privilege in placing on record my profound thanks to Dr. T.
Dayakar Reddy Professor and Head, and Dr. S. Sudheer Kumar, Professor, Post
Graduation in-charge for their moral support and timely help in successful completion
of my course. It's an immense pleasure to express great, heartfelt respect to my beloved
Teachers Dr. K. Radhakrishna, Dr. N.A. Ansari, Dr. Kuldeep Singh and Dr. M.,
Bharathi , Professors, Dr. M. Sujatha, Dr. Farzana Jabeen, Dr. Hemalatha Dr. K.
Radhika and Dr. Eshwari Associate professors and Dr. J. Suresh Assistant Professor
who have guided me, all the way to reach up to this level.
I owe my special debt of sincere gratitude and appreciation to my beloved teacher
Dr. V. Sailaja, Associate Professor, Department of Soil Science, College of Agriculture,
Rajendranagar, Hyderabad and beloved senior G. Usha Rani, Scientist (Plant
Breeding), Regional Agricultural Research Station (RARS), Palem, Andhra Pradesh for
their love, affection, special care and all time pragmatic help and cooperation which
helped for my goal setting and spiritual upliftment during my studies and worries.
Words are not enough to express my whole-hearted and affectionate gratitude to
my beloved parents Sri. K. Sadanandam and Smt. K. Sujatha for their unbounding
love, unparallel affection and unstinted encouragement throughout my educational
career and without whose invaluable moral support, the thesis would not have seen the
light of the day.
With boundless affection, I would hearty acknowledge the constant
encouragement, co-operation and enthusiasm given to me by beloved brother
K. Anil Kumar, sister Swathi and brother-in-law Shyam.
No words are enough to express the affection to my special friends Shilpakala,
Sridhar, Saritha, Uma, Shalini, G.V. Lakshmi, Pooja, Hyma, Shiva, Tirupathi and
Vijay for their help, guidance, constant encouragement and companionship in my
personal and professional life.
I express my heartfelt gratitude and thanks to my Divisional Seniors, Sri Krishna
Latha, Ravikiran, Srikanth, G.P, Prashanth, G.K, Rajesh, Prasanna, Parimala,
Sumalini, Swarna, Lingaiah, Sukumar, Sadaiah, M.S.Reddy, Rajender, Sravani,
Shiva, Parushuram and Mahadev for their valuable guidance and encouragement.
It is a great pleasure to acknowledge the affection and inspiration rendered by my
junior friends Nirosha, Ramya, Priyanka, Susmitha, Jaya Prakash, Naveen, Kalyan,
Mahesh, Sreejan, Shiva, Shankar, Ravindra, Suresh, and Santhosh, Rajkumar.
It is a pleasure to acknowledge the affection and inspiration rendered by my
department friends, Rakesh, Sandeep, Uma Nagesh, Durga Raju, Sriram, Rakesh,
R.P, Mahantesh, Meena, Sandeep, Steffi, Vandana, Pragnya, Shruthi, Swapna and
Shankar for their for their moral support during research work.
I humbly thank the authorities of Acharya N.G. Ranga Agricultural University
and Government of Andhra Pradesh for the financial help in the form of stipend during
my study period.
Finally, I wish my humble thanks to one and all who have directly or indirectly
contributed to the conduct of the study.

(K. SRAVANTI)
LIST OF CONTENTS

CHAPTER NO. TITLE PAGE NO.
I INTRODUCTION
II REVIEW OF LITERATURE
III MATERIAL AND METHODS
IV RESULTS AND DISCUSSION
V SUMMARY AND CONCLUSIONS
LITERATURE CITED
LIST OF TABLES

Table
Title Page No.
No.
Analysis of variance for randomized block design for
4.1
yield and yield component characters in maize
Mean performance of parents, crosses and standard checks
4.2
for yield and yield component characters in maize
Analysis of variance for combining ability for yield and
4.3
yield component characters in maize
Estimation of gca and sca variance for yield and yield
4.4
component characters in maize
Estimates of general combining ability (gca) effects and
4.5 specific combining ability (sca) effects for yield and yield
component characters in maize
Per cent mid parent heterosis, heterobeltiosis and standard
4.6a heterosis for days to 50% tasseling and days to 50%
silking
Per cent mid parent heterosis, heterobeltiosis and standard
4.6b
heterosis for days to maturity and plant height
Per cent mid parent heterosis, heterobeltiosis and standard
4.6c
heterosis for ear height and ear length

Per cent mid parent heterosis, heterobeltiosis and standard
4.6d
heterosis for ear girth and number of kernel rows per ear

Per cent mid parent heterosis, heterobeltiosis and standard
4.6e heterosis for number of kernels per row and 100-kernel
weight
Per cent mid parent heterosis, heterobeltiosis and standard
4.6f
heterosis for grain yield per plant and grain yield per plot

4.7 Phenotypic (P) and Genotypic (G) correlation coefficient

analysis of yield and yield component characters in maize

Phenotypic (P) and Genotypic (G) path coefficient
4.8
analysis of yield and yield component characters in maize