Aestivation in Plants is the arrangement of petals and sepals in floral buds before blooming.
It is arranged with respect to the other members of the whorl.
The term aestivation is often confused with vernation which basically refers to the arrangement of new leaves and scales in a leaf bud..
There are four types of aestivation in plants which are valvate aestivation, twisted aestivation, imbricate aestivation, vexillary aestivation and quincuncial aestivation..
Aestivation is the term used for the arrangement of calyx (sepals) and corolla (petals) in relation to one another in a flower.
Aestivation is of five different types : 1.
Valvate – the type of aestivation in which sepals or petals are arranged in a whorl close together, and they do not overlap each other..
Aestivation - The mode of arrangement sepals or petals in floral bud with respect to the other members of the same. whorl is known as aestivation.
Following are the is known as aestivation. .
1) Valvate- when sepals or petals in a whorl just touch one another at the margin, without overlapping..
Aestivation is generally defined as a type of dormancy, which is a survival strategy used to sustain lack of food and other extreme conditions (Pinder et al., 1992; Abe, 1995; Storey, 2002).
Animals that aestivate become inactive and stop feeding in response to warm temperatures..
Aestivation (in botanical terms) is the arrangement of sepals and petals in floral buds with respect to other members of the whorl.
It is often confused 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..
Aestivation or estivation is the positional arrangement of the parts of a flower within a flower bud before it has opened.
Aestivation is also sometimes referred to as praefoliation or prefoliation, but these terms may also mean vernation: the arrangement of leaves within a vegetative bud..
Aestivation - The mode of arrangement sepals or petals in floral bud with respect to the other members of the same. whorl is known as aestivation.
Following are the is known as aestivation. .
1) Valvate- when sepals or petals in a whorl just touch one another at the margin, without overlapping..
In aestivation, animals look for moist and cool locations.
Some of the animals that undergo hibernation include insects, birds, mammals, and bats.
The animals that undergo aestivation include earthworms, frogs, bees, snails, salamanders, tortoises, and crocodiles..
(a) Valvate aestivation — In this type, either the margins of sepals or petals simply touch each other but they do not overlap; valvate sepals are found in Malvaceae.
Examples – Hibiscus rosa-sinensis; valvate petals are also found in Calotropis sp. and plants of the family Mimosaceae..
The examples of aestivation of different types are noted below: Valvate aestivation: Hibiscus, Calotropis, mustard and Annona.
Twisted aestivation: Cotton, ladyfinger, Hibiscus.
Imbricate aestivation: Legumes, flowers of Gulmohar..
Perianth aestivation is defined by the position, arrangement, and overlapping of floral perianth parts (Figure 9.20).
Aestivation can be an important systematic character for delimiting or diagnosing some flowering plant taxa..
In this kind of aestivation, the outermost whorl or perianth includes petals and sepals that overlap each other in a way that few petals are entirely inside and some are entirely outside.
Thus, the overlapping of calyx or corolla in imbricate aestivation is non-specific, i.e. not occur in a specific position.
Descending imbricate and ascending imbr.
It also refers as ascending imbricate aestivation and just contradicts the arrangement in descending imbricate aestivation.
In this type, the overlapping of petals begins from the anterior end to the posterior end.
In this type, the whorl of perianth is spirally arranged and not in a single whorl.
The odd posterior petal is first intersected by the.
It is also calledcontorted or convolute aestivation.
It includes the flowers whose sepals or petals are organized in such a way, in which one edge overlaps the next edge inside.
Thus they regularly overlap the neighbouring members on one side.
Example: Flowers of Hibiscus,ladyfinger and cotton.
It is an open kind of aestivation, which includes flowers whose sepals and petals are only attached through the margins in a single whorl by leaving a free space within them.
In simple words, the edges of calyx and corolla are very close within a floral whorl but do not intersect each other.
Example: Mustard, Annona and Calotropisflower
It is also known as papilionaceous ordescending imbricate aestivation.
In this type, the overlapping of petals starts from the posterior end towards the anterior side.
It includes such flowers, in which the odd posterior petal intersects the margin of two lateral petals.
A pair of smallest anterior petals are overlapped by the two lateral petals or.
Topics referred to by the same term
