The stomatal relationships, development, and mature structure of some Amaryllidaceous leaves

Wicks, Lillian Mary

(1933)

Wicks, Lillian Mary (1933) The stomatal relationships, development, and mature structure of some Amaryllidaceous leaves.

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Abstract

An investigation has been made of: i) Variations in the number and form of the stomata, papillae, and ordinary epidermal cells over the individual leaf. ii) Growth of the leaf with special reference to meristematic activity, and the vascular system. iii) Comparative anatomy of Amaryllidaceous leaves with special reference to the inverted bundle system. Variations in the water supply to the successive intercalary portions of the leaf cause variations in the degree of expansion of the epidermal cells. This modifies the stomatal frequencies (numbers per unit area) as otherwise determined by the index value (proportion of epidermal units converted into stomata). .The typical frequency gradients are: i. Increasing gradient from base towards the apex of the leaf, with a secondary decrease at the apex. ii. Increasing gradient from the mid-rib to the margin for broad leaves, and decreasing for narrow leaves. Stomatal indices are more constant than frequencies, but give similar gradients. The basal growth of the leaf-limb is due to: i. Meristematic activity and auxesis of the peripheral tissues forming the epidermis and assimilating tissues. ii. Auxesis only of the central ground-tissue. The extent of mature leaf-limb increases during growth but its water supply is limited by the amount that can be conducted through the extending zone. This supply improves due to the lignification of the immature tracheids present in the dormant leaf. In only six genera of the Amaryllidaceae are concentric leaves found excluding the Conostylideae. These leaves have adaxial inverted bundles which were found to differ in their mode of connection with the stem system. They may curve round into the sheathing portion of the leaf-base, passing directly to the stem system as in Ianthe. or they may be independent, ending in groups of storage tracheids in the upper part of the leaf-base, as in Narcissus poeticus and Zeph vranthes candida. It is difficult to harmonise the results from the two latter with the Phyllode theory.

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This is a Accepted version
This version's date is: 1933
This item is not peer reviewed

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https://repository.royalholloway.ac.uk/items/a81a27f6-1bd5-4db2-8eee-c8956087c1dc/1/

Item TypeThesis (Masters)
TitleThe stomatal relationships, development, and mature structure of some Amaryllidaceous leaves
AuthorsWicks, Lillian Mary
Uncontrolled KeywordsPlant Sciences; Biological Sciences; Amaryllidaceae; Amaryllidaceous; Amaryllidaceae; Development; Leaves; Mature; Relationships; Some; Stomatal; Structure
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Identifiers

ISBN978-1-339-61239-3

Deposited by () on 31-Jan-2017 in Royal Holloway Research Online.Last modified on 31-Jan-2017

Notes

Digitised in partnership with ProQuest, 2015-2016. Institution: University of London, Bedford College (United Kingdom).


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