Effect of water stress on the epicuticular wax composition and ultrastructure of cotton (Gossypium hirsutum L.) leaf, bract, and boll
| Autor: | Kyung Soo Kim, Derrick M. Oosterhuis, John Brad Murphy, B.R. Bondada |
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| Rok vydání: | 1996 |
| Předmět: |
Alkane
chemistry.chemical_classification Bract Wax Nonacosane Plant Science engineering.material Biology biology.organism_classification Fiber crop Epicuticular wax chemistry.chemical_compound chemistry visual_art Botany engineering visual_art.visual_art_medium Composition (visual arts) Agronomy and Crop Science Ecology Evolution Behavior and Systematics Malvaceae |
| Zdroj: | Environmental and Experimental Botany. 36:61-69 |
| ISSN: | 0098-8472 |
| DOI: | 10.1016/0098-8472(96)00128-1 |
| Popis: | The epicuticular waxes (EW) of leaves, bracts, and bolls of cotton ( Gossypium hirsutum L.) were studied with respect to total accumulation, chemical composition, and their ultrastructure under well-watered and water-stressed conditions. Leaf, bract, and boll accumulated 91.71 μg cm −2 , 74.18 μg cm −2 , and 152.58 μg cm −2 of wax, respectively, under well-watered conditions, while water stress increased the wax concentration to 154.60 μg cm −2 , 108.91 μg cm −2 , and 158.53 μg cm −2 in the leaf, bract, and boll, respectively. Water stress increased the number and levels of long-chain, higher molecular weight alkanes in the leaf and bract wax, whereas the water-stressed boll wax contained only the long-chain alkanes. Among the long-chain alkanes, n -octacosane (2.70%), n -nonacosane (1.76%), n -triacontane (2.10%), dotracontane (4.60%), and n -tetratriacontane (24.50%) were the chief constituents of the water-stressed leaf wax. The bract wax contained n -octacosane (3.30%) and n -triacontane (38%). n -Octacosane (21.70%), n -nonacosane (8.60%), and n -triacontane (27.90%) were the long-chain alkane constituents of the boll wax. Alkanes constituted 65.94%, 51.00%, and 58.20% of the total wax in the water-stressed leaf, bract, and the boll, respectively, whereas wax from well-watered leaf, bract, and boll contained 10.53%, 25.70%, and 91.30% alkanes, respectively. Scanning electron microscopy revealed that the adaxial and abaxial surfaces of the leaf and bract, and the boll exterior surface had analogous wax morphology under both water-stressed and well-watered conditions. The results suggested that water stress increased the levels of long-chain alkanes in the epicuticular wax in which n -tetratriacontane was the major wax constituent of the water-stressed leaf, whereas the water-stressed bract and boll contained n -triacontane as the major wax component. |
| Databáze: | OpenAIRE |
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