Ultrastructure of P-protein inHevea brasiliensis during sieve-tube development and after wounding |
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Authors: | Ji-lin Wu Bing-zhong Hao |
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Institution: | (1) South China Academy of Tropical Crops, Hainan |
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Abstract: | Summary P-protein and the changes it undergoes after wounding of sieve tubes of secondary phloem in one- to two-year old shoots ofHevea brasiliensis has been studied using electron microscopy. The P-protein in the form of tubules with a diameter of 8–9 nm and a lumen of 2–2.5 nm occurred in differentiating sieve elements and appeared as compact bodies which consisted of small aggregates of the tubules. As the sieve elements matured, these P-protein bodies dispersed with a disaggregation of the tubules before they turned into striated fibrils, 10–11 nm in diameter. In wounding experiments, as the mature sieve elements collapsed after cutting, their striated P-protein converted into tubules. These tubules were the same in ultrastructure as the tubules in differentiating sieve elements and they often were arranged in crystalline aggregates. |
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Keywords: | Hevea brasiliensis P-protein Sieve element Wounding |
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