NDLI: Ontogenic Changes in Epicuticular Wax and Chloroplast Integrity of a Cotton (Gossypium hirsutum L.) Leaf

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Ontogenic Changes in Epicuticular Wax and Chloroplast Integrity of a Cotton (Gossypium hirsutum L.) Leaf

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Ontogenic Changes in Epicuticular Wax and Chloroplast Integrity of a Cotton (Gossypium hirsutum L.) Leaf

Content Provider	Springer Nature Link
Author	Bondada, B.R. Oosterhuis, D.M.
Copyright Year	2002
Abstract	The progressive decline in cotton leaf photosynthesis with season could be accounted for by gaining an insight into ontogenic changes in chloroplast integrity and epicuticular wax ultrastructure. Therefore, the sequence of ultrastructural changes in chloroplast and epicuticular wax morphology were probed in 10-, 20-, 40-, and 60-d-old cotton (Gossypium hirsutum L.) leaves using electron microscopy. Scanning electron microscopy illustrated that the epicuticular wax on the periclinal walls of the convex epidermal cells occurred as striations and persisted as such during the course of leaf aging. The degree of wax spread, however, increased as the leaf progressed towards senescence. Transmission electron microscopy revealed that a 20-d-old photosynthetically active leaf possessed healthy chloroplasts (6.8 μm long and an area of 9.7 μm$^{2}$) with absolute membrane integrity depicted by large appressed grana stacks of thylakoids interconnected by non-appressed stroma lamellae. The thylakoid membrane network was oriented parallel to the long axis of the chloroplast and a few small plastoglobuli (1.85 μm$^{2}$) scattered in the stroma. Conversely, membrane integrity was lost with leaf age after 20 d as evidenced by disruption of the grana and stroma lamellae. Concurrent with the membrane damage, extensive occlusion of chloroplast by several large spherical plastoglobuli (5.68 μm$^{2}$) occurred, the rate of occlusion increased with leafage distending the chloroplast as evidenced by proliferation of its cross-sectional area (12.8 μm$^{2}$). Of particular interest was the finding that the plastoglobuli ensued through the chloroplast envelope into the cytoplasm. The progressive loss of chloroplast membrane integrity coupled with increased leaf waxiness may have limited photosynthetic activities of cotton leaves during senescence.
Starting Page	431
Ending Page	436
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	40
Issue Number	3
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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