– Genetic Studies on Seed Coat Texture and Cooking Time in Some Varieties of Cowpea –
Download Genetic Studies on Seed Coat Texture and Cooking Time in Some Varieties of Cowpea project materials: This project material is ready for students who are in need of it to aid their research.
ABSTRACT
Genetic studies on seed coat texture and cooking time in some varieties of cowpea (Vigna unguiculata (L.) Walp.) were carried out between August 14, 2000 and November 20, 2002 and August 2, 2001, and December 3, 2003, respectively.
The experiments were carried out at the research and teaching farm, Federal University of Technology, Yola, Adamawa State. Randomized complete block design with five replications was used for the two experiments.
Appropriate crosses were made among eight cowpea varieties with four types of seed coat texture in order to study the inheritance pattern of seed coat texture. Seed coat texture was observed to be controlled by two gene pairs with various forms of gene interactions such as dominance and recessive epistasis.
Complete dominance of smooth seed coat texture over wrinkle, rough and lose seed coat textures were observed. Wrinkle seed coat texture plants also show complete dominance over rough and loose seeded plants. Recessive epistasis was observed in the cross between rough seed coat texture and loose seed coat texture.
TABLE OF CONTENTS
Title Page i
Certification ii
Declaration iii
Acknowledgement iv
Dedication v
Table of Contents vi
List of Tables ix
List of Figures xiii
List of Plates xiv
Abstract xv
CHAPTER ONE: INTRODUCTION 1
1.1 BACKGROUND INFORMATION 1
1.2 CONCEPT/STATEMENT OF PROBLEM 2
1.3 JUSTIFICATION 3
1.4 GENERAL OBJECTIVES AND RESEARCH SCOPE 4
CHAPTER TWO: LITERATURE REVIEW 5
2.1 ORIGIN OF COWPEA 5
2.2 TAXONOMY 6
2.3 CYTOLOGY 7
2.4 MORPHOLOGY 7
2.5 PRODUCTION 8
2.6 UTILIZATION of 10
2.7 PRODUCTION CONSTRAINTS 11
2.8 COWPEA GENETICS 12
CHAPTER THREE: MATERIALS AND METHODS 20
3.1 EXPERIMENT 1: INHERITANCE OF SEED COAT
TEXTURE IN SOME VARIETIES OF COWPEA 20
3.2 EXPERIMENT 2: INHERITANCE OF COOKING TIME
IN SOME VARIETIES OF COWPEA 24
3.3 GENETIC AND STATISTICAL ANALYSIS 32
CHAPTER FOUR: RESULTS 40
4.1 INHERITANCE OF SEED COAT TEXTURE IN
SOME VARIETIES OF COWPEA 40
4.2 INHERITANCE OF COOKING TIME IN
SOME VARIETIES OF COWPEA 76
4.2.1 Evaluation of Cooking Time in the Eight
Cowpea Varieties 76
4.2.2 Generation Mean Analysis 76
CHAPTER FIVE: DISCUSSION 109
5.1 INHERITANCE OF SEED COAT TEXTURE IN
SOME VARIETIES OF COWPEA 109
5.2 INHERITANCE OF COOKING TIME IN COWPEA
SOME VARIETIES OF COWPEA 111
5.3 CONCLUSION 116
SUMMARY OF FINDINGS 118
CONTRIBUTION TO KNOWLEDGE 120
REFERENCES 122
APPENDICES 130
INTRODUCTION
Cowpeas are grown extensively throughout the lowland tropics of Africa in a broad belt along the Southern fringes of the Sahara and in Eastern Africa from Ethiopia to South Africa.
They are mainly confined to the hot semi-arid to sub-humid areas with significant production in Nigeria (which alone produces about 61% of the World production), Niger, Burkinafaso, Uganda and Senegal (Rachie and Roberts, 1974).
The crop is also extensively cultivated in India, Southeastern Asia, Australia, the Caribbean lowland and coastal areas of South and Central America and in the Southern regions of the United States. In Nigeria, cowpea is the most important and widely grown grain legume (Fatokun and Singh, 1987).
Cowpeas are widely consumed in different forms in Nigeria and other West African countries. Various types of products are traditionally produced by soaking, dehulling, grinding, boiling or frying (Akinyele et al., 1986).
Cowpea contributes 60-70KgN/ha in the soil due to its nitrogen-fixing properties and also serves as a residue, which benefits the succeeding crops. It is also a shade-tolerant and, therefore, compatible as an intercrop with a number of cereals and root crops, as well as with cotton, sugarcane and several plantation crops.
Coupled with these attributes, its quick growth and rapid ground cover have made cowpea an essential component of sustainable subsistence agriculture in marginal lands and drier regions of the tropics, where rainfall is scanty and soils are sandy with little organic matter (Singh et al., 1997).
REFERENCES
Abadassi, J.A., Singh, B.B., Ladeinde, T.A.O., Shoyinka, S.A. and Emechebe, A.M. (1987). Inheritance of resistance to brown blotch, Septoria leaf spot and scab in cowpea (Vigna unguiculata (L.) Walp). Indian Journal of Genetics 47:299-303.
Aggarwal, V.D. (1985). Cowpea Striga research. In: S. R. Singh and K.O. Rachie (ed), Cowpea research, production and utilization. John Wiley and
Sons, Chichester, UK, pp. 335-340.Aggarwal, V.D. (1991). Research on cowpea Striga resistance at IITA. In: S. K. Kim (ed), Combating striga in Africa, IITA, Ibadan, Nigeria, pp. 90-95.
Agwaranze, N.F.U. (1992). Morphological variability, inheritance of pubescence in Vigna vexillata and the histology of hybrids between wild Vigna and cultivated cowpea (Vigna unguiculata (L.) Walp). Ph.D. Thesis, University of Ibadan, Ibadan, Nigeria. 208pp.
Akinyele, I.O., Onigbinde, A.O., Hussani, M.A. and Omololu, A. (1986).
Physiochemical characteristics of 18 cultivars of Nigeria cowpea (V. unguiculata L.Walp) and their cooking properties. Journal of Food Science 51: 1483-1485.
Akoroda, M.O. (1981). Studies on the genetics and floral biology of yams (Dioscorea retundata Poir and Dioscorea cayenensis Lam.). Ph.D Thesis, University of Ibadan, Nigeria. 298pp.
StudentsandScholarship Team.
Be the first to comment