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Updated on 09th August, 2023 , 5 min read
Aestivation in plants refers to the arrangement of floral organs (petals, sepals, stamens, and pistils) in a flower bud before it opens. The term is also known as prefloration. It is often befuddled with vernation, which is the arrangement of scales and new leaves in a leaf bud before it opens. The sepals and petals are collectively known as a perianth. The course of action of perianth inside a flower bud before it blooms is known as the aestivation of plants.
Aestivation in plants means arrangement of accessory floral organs (sepals or petals) in relation to one another in a flower. Aestivation is the flower characteristic that illustrates the course of action of corolla (petals) and calyx (sepals) in connection to each other in a flower bud. Corolla and calyx are collectively known as the perianth. The term aestivation in plants is like the term vernation, which describes the organization of the leaves inside a vegetative bud.
Aestivation in plants is an important part of taxonomyas flowers of different species how different aestivation. The five different types of aestivations are:
What is aestivation: Types | What is aestivation: Examples |
Valvate Aestivation in plants | Examples of flowers with valvate aestivation include the Brassica flower and the Arabidopsis flower |
Twisted Aestivation in plants | Examples of flowers with twisted aestivation include the Hibiscus flower and the Malva flower |
Imbricate Aestivation in plants | Examples of flowers with imbricate aestivation include the Tulip flower and the Lilium flower |
Vexillary Aestivation in plants | Examples of flowers with vexillary aestivation include pea flowers, bean flowers, and lentil flowers |
Quincuncial Aestivation in plants | Examples of flowers with quincuncial aestivation include the Magnolia flower and the Liriodendron flower |
The calyx may be gamosepalous (sepals united) or polysepalous i.e., sepals free. Aestivation in plants basically refers to the way sepals and petals or the perianth, are arranged in a floral bud before it blooms. The corolla means the outer petals of a flower. The shape and color of corolla vary greatly in plants. Corolla may be tubular, bell shaped, funnel-shaped or wheel-shaped. Corolla is a combination of petals, and they are usually bright in color to attract insects for pollination.
There are four types of aestivation in plants which are valvate aestivation, twisted aestivation, imbricate aestivation, vexillary aestivation and quincuncial aestivation.
Type of Aestivation | Description | Examples of Flowers |
| Crumpled | Crumpled aestivation in plants is a type of aestivation where corolla's petals overlap in a crumpled and twisted manner in the bud. This results in a wavy appearance of the unopened bud. | Hibiscus rosa-sinensis, also known as Chinese hibiscus |
| Twisted | Twisted aestivation in plants, also known as contorted aestivation or convolute aestivation, is a type of prefloration in plants where the floral organs (petals, sepals, etc.) are twisted or rolled up longitudinally in the floral bud. | Ladyfinger, Cotton, and Hibiscus flowers |
| Valvate | Valvate aestivation in plants is a type of prefloration in plants where the margins of the floral organs (petals, sepals, etc.) are in contact with each other, without overlapping, in the floral bud. | Sweet Pea,Garden Pea, Yellowwood |
| Imbricate | Imbricate aestivation is a type of prefloration in plants where the floral organs (petals, sepals, etc.) are arranged in a manner where the margins of the floral organs overlap each other in the floral bud. This results in a bud that appears to be covered in scales or tiles, like shingles on a roof. | Flowers of Gulmohar |
| Quincuncial | Quincuncial aestivation is a term used to describe the way that the petals or sepals of a flower are arranged in a bud before it opens. In this arrangement, there are five overlapping structures, with two outer structures enclosing three inner structures. | Delonix and Cassia flowers |
| Vexillary | In vexillary aestivation in plants, the largest petal (called the vexillum or banner) is placed on top of the two lateral petals, which in turn cover the two smallest petals at the base. This arrangement is commonly found in flowers of the legume family, such as peas, beans, and lentils. It is also known as descending imbricate or papilionaceous aestivation. | Crotalaria, Dolichos, and Tephrosia flowers |
Placentation in plants refers to the arrangement of ovules within the ovary of a flower. Ovules are the structures that contain the female reproductive cells (eggs) and are attached to the ovary wall by a stalk-like structure called the funiculus. It is the number, position, and arrangement of the placentas within the ovary.
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By - Nikita Parmar 2023-08-25 09:48:44 , 11 min readAestivation in plants refers to the arrangement of sepals or petals in a flower bud before it opens up.
Aestivation in plants is an important part of taxonomy as flowers of different species show different aestivation. The four different types of aestivation are: 1. Valvate Aestivation 2. Twisted Aestivation 3. Imbricate Aestivation 4. Vexillary Aestivation
Aestivation in plants refers to the arrangement of sepals or petals in a flower bud before it opens up. There are several types of aestivation, including vexillary, imbricate, valvate, twisted, and quincuncial aestivation.
An example of aestivation can be seen in the flower buds of the pea family (Fabaceae).
Aestivation refers to the arrangement of sepals or petals in a flower bud before it opens up. It is a strategy used by plants to protect their reproductive structures from harsh environmental conditions like drought or extreme temperatures. Hibernation, on the other hand, is a physiological adaptation used by some animals to survive the winter. During hibernation, the animal’s body temperature drops, its metabolism slows down, and it enters a state of reduced activity. This allows the animal to conserve energy during the winter when food is scarce.
The Casparian strip or band occurs in the endodermis of the roots of plants. It is a region of the cell wall that is impervious to water and solutes, and it helps to regulate the passage of water and nutrients from the soil into the plant
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