Crop Improvement-II (Rabi Crops) Study Notes

Crop Improvement - Rabi Crops: Comprehensive Study Guide

General Information

  • Compiled by: Dr. R. M. Pawar
    • Department: Agricultural Botany

Table of Contents

  1. Cereals: Wheat, Oat, and Barley
    • Pages 2-7
  2. Pulses: Chickpea
    • Pages 8-10
  3. Oilseeds: Sunflower and Safflower
    • Pages 11-15
  4. Oilseeds: Linseed, Rapeseed, and Mustard
    • Pages 16-19
  5. Fodders: Napier Grass, Bajra, Sorghum, Maize, and Berseem
    • Pages 20-28
  6. Cash Crop: Sugarcane
    • Pages 29-32
  7. Vegetable Crop: Potato
    • Pages 33-35
  8. Vegetable Crop: Field Pea
    • Pages 36-37
  9. Horticultural Crops: Mango, Aonla, and Guava
    • Pages 38-44
  10. Plant Genetic Resources, its Utilization, and Conservation
    • Pages 45-49
  11. Adaptability and Stability
    • Pages 50-53
  12. Hybrid Seed Production Technology in Rabi Crops
    • Pages 54-64
  13. Ideotype Concept and Climate Resilient Crop Varieties
    • Pages 65-72

1. Cereals: Wheat, Oat, and Barley

1.1 Wheat
  • Botanical Names and Ploidy Levels:
    • Triticum aestivum L. - Hexaploid (2n = 6x = 42)
    • Triticum durum - Tetraploid (2n = 4x = 28)
    • Triticum monococcum L. - Diploid (2n = 2x = 14)
  • Family: Gramineae/Poaceae
  • Centers of Origin:
    • Bread wheat originated in Near East: Iran, Iraq, Afghanistan.
    • Diploid wheat originated in Asia Minor.
    • Cultivated in countries like USA, UK, Russia, China, India.
  • Wild Relatives:
    • Triticum timopheevii, Aegilops species.
  • Floral Biology:
    • Inflorescence: Spike or ear type.
    • Features include chasmogamous flowers, self-pollination.
    • Fruit: Grain called caryopsis, with various colors.
  • Breeding Objectives:
    1. High grain yield
    2. Lodging resistance (dwarfing gene)
    3. Resistance to diseases (rust, blights)
    4. Resistant to pests (aphids, weevils)
    5. Quality breeding (milling and baking)
  • Breeding Methods:
    • Introduction, Selection, Pure Line Selection, Hybridization, etc.
1.2 Oat
  • Botanical Name: Avena sativa L., Hexaploid (2n = 6x = 42)
  • Centers of Origin: Near East/Mediterranean.
  • Distribution: Northwest Europe, India (Himalayan regions).
  • Floral Biology:
    • Inflorescence is a panicle, flowers consist of lemma and palea features.
  • Breeding Objectives:
    1. Economic competitiveness; harvesting high yields.
    2. Improved milling quality.
    3. Increased value for ruminants/industrial use.
1.3 Barley
  • Botanical Name: Hordeum vulgare, Diploid (2n = 2x = 14)
  • Centers of Origin: Near East/Ethiopia.
  • Distribution: Major producer countries include Russia & India.
  • Floral Biology:
    • Annual grass structure with specific floral arrangement in spikelets.

2. Pulses: Chickpea

2.1 Chickpea
  • Botanical Name: Cicer arietinum, Diploid (2n = 2x = 16)
  • Centers of Origin: SW Africa and Mediterranean region.
  • Distribution: Majorly grown in India, with significant production in M.P. and U.P.
  • Floral Biology:
    • Flower structure includes papilionaceous features.
    • Self-pollination is predominant, with a variable cross-pollination rate.
  • Breeding Objectives:
    1. Increased seed yield.
    2. Resistance to diseases (Ascochyta blight, Fusarium wilt).
    3. Tolerance to environmental stress.

3. Oilseeds: Sunflower and Safflower

3.1 Sunflower
  • Botanical Name: Helianthus annuus, Diploid (2n = 2x = 34)
  • Centers of Origin: Central America.
  • Distribution: Cultivated widely in India and other countries.
  • Floral Biology:
    • Inflorescence is a capitulum with distinct florets.
    • Pollination predominantly by insects, especially honey bees.
  • Breeding Objectives:
    1. High seed yield.
    2. Early maturity.
    3. High oil content (46-52%).
3.2 Safflower
  • Botanical Name: Carthamus tinctorius, Diploid (2n = 2x = 24)
  • Centers of Origin: Ethiopia/Afghanistan.
  • Distribution: Majorly grown in Maharashtra and India.
  • Floral Biology:
    • Inflorescence consists mainly of disc florets.
  • Breeding Objectives:
    1. Increased oil content.
    2. Higher seed yield and tolerance to abiotic stresses.

4. Oilseeds: Linseed, Rapeseed, and Mustard

4.1 Linseed
  • Botanical Name: Linum usitatissimum, Chromosome number: 2n=30
  • Centers of Origin: South Western Asia.
  • Distribution: Significant in India and worldwide.
  • Floral Biology:
    • Pentamerous flowers with specific morphological traits.
  • Breeding Objectives:
    1. Higher yield and early maturity.
    2. Disease resistance (wilt and rust).
4.2 Rapeseed and Mustard
  • Family: Cruciferae
  • Economic Importance: Varieties like Brassica campestris, Brassica juncea with diverse uses.

5. Fodders: Napier, Bajra, Sorghum, Maize, and Berseem

5.1 Objectives
  • High dry matter yield, improved quality components., tolerance to adverse soils.
  • Characteristics focusing on greater persistence and better growth when intercropped.

6. Cash Crop: Sugarcane

6.1 Sugarcane
  • Botanical Name: Saccharum officinarum, Chromosome number: 2n = 80
  • Centers of Origin: New Guinea and other Asian regions.
  • Distribution: Entailing major state presence in India.
  • Breeding Objectives:
    1. Focus on high cane yield, quality of sugar, and disease resistance strategies.

7. Vegetable Crop: Potato

7.1 Potato
  • Botanical Name: Solanum tuberosum, 2n=2x=48
  • Centers of Origin: Andes region.
  • Breeding Objectives:
    1. Higher tuber yield, early maturity, and resistance against diseases.

8. Vegetable Crop: Field Pea

8.1 Field Pea
  • Botanical Name: Pisum sativum L., 2n=2x=14
  • Breeding Objectives:
    1. Increased biomass, resistance to health stressors, and improved seed quality.

9. Horticultural Crops: Mango, Aonla, and Guava

9.1 Mango
  • Botanical Name: Mangifera indica L.
  • Breeding Objectives:
    1. Cultivation imparting good fruit quality and increased disease resistance.
9.2 Aonla
  • Botanical Name: Emblica officinalis
  • Breeding Objectives:
    1. High-quality fruit with improvements in yield and keeping quality.
9.3 Guava
  • Botanical Name: Psidium guajava L.
  • Breeding Objectives:
    1. Enhance yield, improve fruit quality, and resistance to pests and diseases.

10. Plant Genetic Resources, Utilization, and Conservation

10.1 Definitions
  • Genetic Resources: Total of genes in a crop species.
  • Gene Pool: Library of different alleles of a species.
  • Germplasm: Total hereditary material in a species and its wild relatives.
10.2 Conservation
  • Collection from diverse sources, significance in gene banks, and addressing genetic erosion caused by modern agricultural practices.

11. Adaptability and Stability

11.1 Definitions
  • Stability: Consistent performance under varying environmental conditions.
  • Adaptability: Performance consistency across diverse environments.
11.2 Types of Adaptation
  • Specific and general adaptation featured prominently within breeding strategies.

12. Hybrid Seed Production Technology

12.1 Overview
  • Utilization of cytoplasmic genetic male sterility mechanisms for hybrid seed production.
  • Principles established in key crops: Sunflower, Safflower, Castor, Rabi Sorghum.

13. Ideotype Concept and Climate Resilient Crop Varieties

13.1 Ideotype
  • Introduced by Donald (1968) for plant movement; identifies optimal morphological and physiological traits across contexts of cultivation.
13.2 Merits and Demerits
  • Effectiveness in increasing yield contrasted with challenges in trait incorporation and variability.

Conclusion

  • These notes encapsulate the breadth of crop improvement strategies focusing on various aspects of Rabi crops including cereals, pulses, oilseeds, and horticultural crops, addressing genetics and plant breeding in the context of agricultural sustainability and productivity.