The formation of seed and fruit without fertilisation is achieved by apomixis and parthenocarpy. In apomixis, seeds and fruit develop without gametic fusion. This occurs in some plants like dandelions and citrus. Parthenocarpy, on the other hand, is the development of seed and fruit without fertilisation, forming seedless fruits, for example, bananas and seedless watermelons.
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Both processes can occur naturally and can also be induced artificially by the use of hormones. These processes maintain plant traits across generations and are also economically important for agriculture, producing seedless, market-friendly fruits. Formation of seed and fruit without fertilisation is an important topic in the biology subject.
A fundamental phenomenon in the process of reproduction in plants is the formation of fruit and seed, which typically takes place after fertilisation. Here, the ovary of the flower is transformed into fruit and the fertilised ovules are matured into seeds. This process starts with the fertilisation of the ovule with the help of the pollen, which forms a zygote. The fruit protects the seeds and helps their dispersal. Thus, it is important to understand this process, as it allows species of plants to continue, provides aid in seed dispersion, and contributes to plant diversity and adaptation of the plant.
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Asexual reproduction in plants includes methods like vegetative propagation and also formation of seeds and fruits without fertilisation. It results in genetically identical offspring and allows for rapid multiplication. The details are explained below-
Apomixis is a mode of asexual reproduction in which the seeds are formed without the act of fertilisation. Its offspring have the same genetic makeup as the parent plant. Hence, by this process, the plants increase in number without pollination or fertilisation and can propagate specific characteristics.
Types of Apomixis:
Gametophytic and Sporophytic: In gametophytic apomixis, the embryo originates from the haploid gametes. In sporophytic apomixis, the embryo develops from the somatic cells of the ovule. In both types, the development of seeds occurs without genetic contribution from male gametes.
Examples in Nature
The dandelion, Taraxacum officinale, commonly propagates by apomixis. Some graminaceous examples, for example, species of Paspalum, are examples that can propagate by sexual means as well as by apomixis.
Parthenocarpy is defined as the phenomenon by which the fruit develops in the absence of the fertilisation of the ovary, giving rise to seedless fruits. It can be induced or naturally occurring, and is often used to provide for fruit crops that are economically more profitable.
Natural vs. Artificial Parthenocarpy
Natural parthenocarpy occurs on its own in some plant species under the influence of genetic factors, whereas artificial parthenocarpy comes about through treatment, for example, hormonal application. The former examples are naturally found in plants like bananas and Musa spp., whereas the latter includes seedless grapes and some cucumbers.
Examples and Applications
Some of the common examples of parthenocarpic fruits include bananas and seedless oranges. The applications herein are the improvement of the quality and marketability of fruits, plus the shelf life of the crop.
Apomixis occurs when seeds form without fertilisation, either through sporophytic (from somatic ovule cells) or gametophytic (from unreduced embryo sacs) apomixis. It bypasses meiosis and syngamy to produce clones of the parent. The mechanism of apomixis is explained below-
In apomixis, seeds are formed without fertilisation. In general, both forms of seeds are similar to each other in their structure, but in the case of gametophytic apomixis, embryos are formed through the gametophyte, whereas in the second case, embryos are formed from the ovule's somatic cells.
Gametophytic Apomixis
It is a type of apomixis in which embryos are developed autonomously from the haploid egg cells or other cells of the gametophyte. This avoids the process of fertilisation, which, upon maturity, will lead to offspring that are genetic replicas of the mother plant.
Sporophytic Apomixis
In sporophytic apomixis, the embryos arise from the somatic cells of the ovule, such as the nucellus or integuments, and do not go through stages of meiosis or fertilisation. It is a process that can give rise to clonal progeny from the mother plant.
Apomixis is influenced by several functional genes involved in the process, like meiosis and embryo development. Molecular pathways participate in regulating cell divisions as well as the formation of embryos, allowing the normal sexual reproduction process to be bypassed.
Role of Specific Genes
Genes that have been associated with apomixis are usually those that regulate seed development and cell differentiation. These include genes that control the formation of haploid gametes and the maintenance of the diploid genetic state of progeny.
Molecular Pathways Involved
Molecular pathways for apomixis mainly involve signal vehicle networks that link the control of embryo development with and without fertilisation. Hormonal regulation and genetic expression mechanisms are also involved in these pathways.
Parthenocarpy involves fruit development without seed formation, either naturally or induced using plant growth regulators like auxins and gibberellins. It results in commercially profitable seedless fruits. The mechanism of parthenocarpy is explained below-
Parthenocarpy is the formation of fruit from an ovary that has not been fertilised. This state can be brought about by hormonal changes or genetic changes. It skips over the fertilisation stage and goes straight to forming seedless fruit.
Hormonal Control
Two very important hormones in the induction of parthenocarpy are auxins and gibberellins. They are responsible for promoting fruiting through stimulation without fertilisation. Even the presence of cytokinins will further increase cell division and fruit set.
Genetic and Environmental Influences
Genetic factors decide the potential of a plant to grow parthenocarpic fruits. On the other hand, environmental conditions, for instance, temperature and light, may—for now, or then—influence the result of the application of hormonal treatments. Application of environmental stress may also cause certain species of plants to exhibit natural parthenocarpy.
Parthenocarpy in crops can be induced by chemical treatments, like the application of synthetic auxins and gibberellins. Parthenocarpic varieties have also been developed through genetic engineering techniques by targeted genetic manipulations.
Chemical Treatments
The application of chemicals like gibberellic acid (GA) and auxin analogues to foster fruit development has been practised. These treatments can be applied directly to plants to improve fruit set and quality.
Genetic Engineering Techniques
Genetic engineering has advanced to produce genetically modified plants with regulated hormones that result in parthenocarpic fruit. These techniques contain gene editing and introduction/transformation to develop more elaborate parthenocarpic traits.
These mechanisms offer benefits like faster propagation, uniform traits, and seedless fruit production. However, they reduce genetic diversity and may result in less adaptation to environmental changes. The advantages and disadvantages are explained below-
The asexual reproduction techniques have many advantages, like apomixis and parthenocarpy, including crop uniformity, seedless fruit, increased shelf life, better recovery cost in the market, and reduced frequency of replanting seeds.
The major disadvantages include loss of genetic diversity in crops, and less resistance to environmental changes and diseases. Besides, all these require high human intervention and very good technical skills, which might increase production costs and complexities.
Q1. Which hormones are commonly used to induce parthenocarpy?
Option 1: Auxins and gibberellins
Option 2: Cytokinins and abscisic acid
Option 3: Ethylene and brassinosteroids
Option 4: None of the above
Correct answer: 1) Auxins and gibberellins
Explanation:
Auxins and gibberellins are the hormones most frequently utilised to cause parthenocarpy, or the formation of fruit without fertilisation.
Auxins: Without fertilisation, these hormones encourage the growth of fruit.
Gibberellins: They also aid in promoting the growth of fruit, particularly in seedless types.
Plants can be treated with either of these hormones to create seedless fruits, like bananas or grapes.
Hence, the correct answer is option 1) Auxins and gibberellins
Q2. Following are certain statements regarding apomixis in plants:
P. Apomixis cannot be used to maintain hybrid vigor over many generations in plants.
Q. In sporophytic apomixis maternal genotype is maintained.
R. There is an event of meiosis during gametophytic apomixis which is also referred to as apomeiosis.
S. In diplospory, meiosis of the megaspore mother cell is aborted, resulting in two unreduced spores, out of which one forms the female gametophyte.
Which one of the following combinations is correct?
Option 1: P and Q
Option 2: P and R
Option 3: Q and R
Option 4: Q and S
Correct answer: 4) Q and S
Explanation:
Q. In sporophytic apomixis maternal genotype is maintained.
S. In diplospory, meiosis of the megaspore mother cell is aborted, resulting in two unreduced spores, out of which one forms the female gametophyte.
Statement P is incorrect. Apomixis, which involves asexual reproduction, cannot maintain hybrid vigour over many generations since it does not involve the recombination and genetic variation that occur through sexual reproduction.
Statement R is incorrect. Meiosis is not a part of gametophytic apomixis, and it is not referred to as apomeiosis. Gametophytic apomixis involves the development of an embryo from an unreduced egg cell or a modified female gametophyte without the need for fertilisation.
Therefore, the correct combination is Q and S. In sporophytic apomixis, the maternal genotype is maintained, and in diplospory, meiosis of the megaspore mother cell is aborted, resulting in two unreduced spores, one of which forms the female gametophyte.
Hence, the correct answer is option 4) Q and S
Q3. What is common between vegetative reproduction and apomixis.
Option 1: Both are applicable to only dicot plants.
Option 2: Both bypass the flowering phase
Option 3: Both occur round the year
Option 4: Both produce progeny identical to the parent
Correct answer: 4) Both produce progeny identical to the parent
Explanation:
Both vegetative reproduction and apomixis produce progeny that are genetically identical to the parent, referred to as clones. These forms of asexual reproduction do not involve the formation of gametes or fertilization and rely on a single parent for reproduction. In vegetative reproduction, new plants arise from vegetative parts like roots, stems, or leaves, while in apomixis, seeds are formed without fertilisation, bypassing the typical sexual reproduction process. Both methods ensure the preservation of genetic uniformity across generations.
Hence, the correct answer is option 4) Both produce progeny identical to the parent
Read more:
Apomixis is the process of asexual production of seeds without fertilisation, while parthenocarpy is the production of fruit without fecundation.
Parthenocarpy naturally results in fruits without seeds, which, in most cases, is an attraction to consumers and therefore increases the market value of the produce.
Yes, apomixis can occur naturally in very few plant species mostly in some grasses and citrus.
Common examples: Banana, grapes, and some citrus fruits.
Artificial parthenocarpy can be induced by the application of plant hormones like auxins, gibberellins, or cytokinins and by the process of genetic engineering.
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