Advantages and Disadvantages of Seed Propagation Quiz and Flashcards

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Questions and Answers

What is the main purpose of the stock/root stock in grafting?

To provide the root system (correct)

To provide the aerial part of the plant

To form the upper portion of the graft

To contribute buds for graft union

Which type of grafting involves inserting young, actively growing woody plants into a T cut?

Side grafting

Crown grafting

Tongue or whip grafting (correct)

Wedge grafting

In budding, why is a single bud from the desired scion used instead of an entire scion?

To accelerate the growth process

To ensure a stronger graft union

To reduce the risk of incompatibility with the root stock (correct)

To provide more buds for future growth

What is the main difference between grafting and budding techniques?

Grafting involves using a single bud, while budding involves using an entire scion. Signup and view all the answers

What is a potential disadvantage of seed propagation compared to grafting and budding?

Higher chance of incompatibility between scion and stock Signup and view all the answers

Which practical consideration could be a disadvantage of grafting and budding compared to seed propagation?

Higher initial cost of materials and tools for implementation Signup and view all the answers

What is the purpose of holding cut surfaces together tightly during grafting?

To prevent water loss and promote healing Signup and view all the answers

Why is it important to maintain the graft at proper environmental conditions?

To optimize callus development at the graft site Signup and view all the answers

What technique is utilized in micropropagation for producing new plants?

Tissue culture Signup and view all the answers

What is the main purpose of acclimatization in micropropagation?

Preparing plants for survival outside the sterile environment Signup and view all the answers

What are the advantages of seed propagation over vegetative propagation methods like budding and grafting?

Greater genetic variation Signup and view all the answers

Why is it essential to protect cut surfaces from desiccation after grafting?

To prevent dehydration and damage to the graft union Signup and view all the answers

What is a major advantage of seed propagation mentioned in the text?

Uniformity and hybrid vigor in the F1 generation Signup and view all the answers

Which process is a risk associated with, except in tissue culture which uses meristems?

Vegetative propagation Signup and view all the answers

What is a major disadvantage of seed propagation mentioned in the text?

Variability in heterozygous plant offspring Signup and view all the answers

Which method can hasten the slow growth of seed-raised plants of some trees and shrubs?

Budding and grafting Signup and view all the answers

Why are some seeds difficult to germinate according to the text?

Dormancy Signup and view all the answers

Which characteristic is NOT mentioned as a disadvantage of seed propagation?

Fast growth leading to early maturity Signup and view all the answers

Study Notes

Advantages of Seed Propagation

Hybrid seed production allows for additional vigor and rejuvenation.
F1 generation hybrid seeds are produced by crossing two pure bred strains, resulting in uniformity and hybrid vigor.
Seeds provide a method of starting disease-free plants, as viral diseases are not usually transmitted through seeds.
Seedlings are required in nurseries to provide rootstock with desirable characters, such as resistance to root diseases.

Disadvantages of Seed Propagation

Variability in heterozygous plants results in variation in resulting progenies due to genetic segregation.
Loss of uniformity over generations poses a major disadvantage in the cut flower industry.
Late maturity and slow growth are common issues, with some plants taking years to mature and flower.
Some seeds are difficult to germinate due to dormancy, and some cultivated plants do not produce seeds at all.

Requirements for Successful Grafting

Rapid healing of the graft union is necessary, requiring the scion to be supplied with water and nutrients from the stock.
Grafts should be maintained at proper environmental conditions, including optimal temperature (24-29°C), high humidity, and darkness.
Cut surfaces must be protected from desiccation, and can be covered with tape, grafting wax, etc.

Micropropagation (Tissue Culture)

Micropropagation involves exposing a part of a plant (cell, tissue, organ) to specific conditions under aseptic environment to produce a new set of plants similar to the mother plant.
There are four basic developmental stages in micropropagation: establishment of an explant culture, multiplication of the propagule, regeneration, and acclimatization.

Methods of Vegetative Propagation

Stock/Root stock provides the root system and forms the lower portion of the graft.
Scion is the aerial part of the combination, contributing to the union with the root stock.
Grafting involves different types, including tongue or whip, crown, wedge, side, and approach grafting.
Budding involves attaching a single bud from the desired scion to the root stock, with different techniques including T budding and patch budding.

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Description

Test your knowledge on the advantages of seed propagation, including hybrid seed production, starting disease-free plants, and the benefits of F1 generation seeds. Explore how sexual reproduction in nature leads to the evolution of new species.