Stomata in Chlorophytum comosum

Differentiation in leaf epidermis of Chlorophytum comosum

Charlton W. A., (1990)

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Annals of Botany 66: 567-578 – https://doi.org/10.1093/oxfordjournals.aob.a088066 –

https://academic.oup.com/aob/article-abstract/66/5/567/147542?redirectedFrom=fulltext

Abstract

The distribution of guard mother-cell formation has been studied in developing abaxial epidermis in the basal meristem of the leaf of Chlorophytum comosum.

It is concluded that, as tissue is displaced from the base of the leaf by growth, it passes through a proliferative zone in which only proliferative mitoses occur, and then passes a boundary into a formative zone in which formative mitoses occur, giving rise to guard mother cells, and proliferative mitoses are absent.

Further distally, formative mitoses die out and in the next zone (the guard-cell zone) the only mitoses which occur are those by which the guard mother cells give rise to the guard cells.

Most distally there is a zone with no mitotic activity. The probability of a cell undergoing a formative mitosis is highest at the proximal boundary of the formative zone. It is consequently suggested that the fate of a cell on entering the formative zone depends partly on its position in the mitotic cycle; cells nearest to mitosis at entry are the most likely to undergo a formative mitosis during their passage through the formative zone.

Similarly, guard mother cells which fail to undergo mitosis may be those which were most distant from mitosis on entry into the guard cell zone. These suggestions may explain some of the elements of pattern previously found in the mature epidermis.

Stomata in 4 monocots

 

Stomatal Pattern in Four Species of Monocotyledons

by Charlton W. A. (1988)

in Ann Bot (1988) 61 (5): 611-621. – 

http://aob.oxfordjournals.org/content/61/5/611 

Abstract

The distribution of stomata has been investigated in the leaf epidermis of Chlorophytum comosum, Galanthus nivalis, Schizostylis coccinea and Scilla lancifolia. The epidermis was considered to consist of units of construction of two kinds: type A, a long epidermal cell with a stoma at its distal end, and type B, a long epidermal cell without an associated stoma.

Except in Scilla, the probability of an epidermal unit being type A increases approximately with its length. Considering the epidermis as rows of units, alternating sequences of type A and type B do not occur randomly along the rows. In Chlorophytum, Galanthus and Schizostylis, both type A and B units tend to be aggregated into longer sequences than would be expected on a random basis.

It is suggested that homoeogenetic induction (i.e. of like by like) may be occurring during development. No case can be made for homoeogenetic induction of units in Scilla. There is a slight tendency to periodicity of distribution of type A units in Galanthus, Schizostylis and Scilla, but this does not seem to represent a primary element of pattern.

There is interaction between rows in the sense that unit ends (transverse walls) tend to avoid those in neighbour rows; this affects the relative distribution of stomata, but there is no evidence of any direct interaction between stomata in different rows.

Stomata in Chlorophytum

 

Differentiation in Leaf Epidermis of Chlorophytum comosum Baker

by Charlton W. A. (1990)

in Ann Bot (1990) 66 (5): 567-578.

Abstract

The distribution of guard mother-cell formation has been studied in developing abaxial epidermis in the basal meristem of the leaf of Chlorophytum comosum.

It is concluded that, as tissue is displaced from the base of the leaf by growth, it passes through a proliferative zone in which only proliferative mitoses occur, and then passes a boundary into a formative zone in which formative mitoses occur, giving rise to guard mother cells, and proliferative mitoses are absent. Further distally, formative mitoses die out and in the next zone (the guard-cell zone) the only mitoses which occur are those by which the guard mother cells give rise to the guard cells. Most distally there is a zone with no mitotic activity.

The probability of a cell undergoing a formative mitosis is highest at the proximal boundary of the formative zone. It is consequently suggested that the fate of a cell on entering the formative zone depends partly on its position in the mitotic cycle; cells nearest to mitosis at entry are the most likely to undergo a formative mitosis during their passage through the formative zone. Similarly, guard mother cells which fail to undergo mitosis may be those which were most distant from mitosis on entry into the guard cell zone. These suggestions may explain some of the elements of pattern previously found in the mature epidermis.

See the text: Annals of Botany