ISSN:
1615-6102
Keywords:
Hevea brasiliensis
;
P-protein
;
Sieve element
;
Wounding
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01354003
Permalink
