MODIFIED HALF-SIB F0000000000000AMILY SECTION- Đình Dũng.pptx

bygygiguhuhl

1. MODIFIED HALF-SIB FAMILY SECTION Trinh Dinh Dung – 670024 Class: K67KHCTT Course: Plant Breeding BREEDING METHODS

2. Introduction 01 03 02 04 Table of contents Significance and Comparison Definition Advantages and Disadvantages

3. Introduction 01 - Plant breeding is a long process that requires accurate evaluation of genetic potential. - Many selection methods have been developed, among which the half-sib family method is common. However, the traditional half-sib approach has some limitations => Improvement is needed . the concept of the MODIFIED HALF-SIB FAMILY SECTION

4. Definition 1. Half-Sib 2. Family Section 3. Modified

5. In plant breeding, a half-sib family refers to a group of progeny that share either the same father or the same mother. Typically, the female parent is clearly identified, while the male parent remains unknown because pollen comes from the general population through open pollination Example: Suppose you have a maize plant as the female parent. It is pollinated by many different plants in the field. All the seeds produced on that plant together form a half-sib family. 1. Half-Sib 2. Family Section

6. 2. Family section - When planted for evaluation, the seeds of each half-sib family are sown in a separate experimental plot. Within this plot, all plants belong to the same family, allowing observation, comparison, and assessment of genetic traits among different families. This is a common approach to estimate yield, resistance, and the genetic potential of each family . => Each plot contains a “family” of plants with a common origin. - Instead of planting randomly, breeders arrange the plots with replication, randomization, or other error-reducing methods. => Purpose: to compare families more accurately and identify the best ones . 3. Modified

7. Evaluate genetic differences among half-sib families Select the best families/plants for further crossing or propagation. Help breeders shorten the breeding cycle and increase efficiency compared to evaluating single plants . Commonly applied in cross-pollinated crops (maize, grasses, sunflower, etc.) where half-sib families are widespread. Significance in breeding

8. COMPARISON WITH TRADITIONAL HALF-SIB FAMILY Criteria Half-sib family Modified half-sib family section Layout Scattered planting, little control Planted in experimental plots/sections with scientific design Accuracy Low, strongly influenced by environment Higher, errors are controlled Application Preliminary yield estimation Precise selection, used in breeding improvement programs

9. ADVANTAGES AND DISADVANTAGES 04

10. 4.1. Advantages - Simpler and more cost-effective compared to more complex designs - Higher accuracy than traditional half-sib due to the improved experimental layout. - Suitable for large-scale programs and applicable across various crops. - Facilitates early selection of promising families or individuals.

11. Still influenced by open pollination → pollen source cannot be fully controlled. Accuracy is lower than methods with strict mating control Requires relatively large field area to accommodate all family plots. Evaluation is time-consuming (at least two growing seasons are needed: seed harvest → experimental planting). 4.2. Disadvantages

12. Do you have any questions?