
TY  - JOUR
A1  - Kallarackal, J 
A1  - Milburn, JA 
T1  - Studies on the Phloem Sealing Mechanism in <I>Ricinus</I> Fruit Stalks
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1983
VL  - 10
IS  - 6
SP  - 561
EP  - 568
KW  - 
UR  - https://doi.org/10.1071/PP9830561 
N2  - Fruit stalks of R. communis were made to exude phloem sap by repeated slicing at intervals of a few minutes. Samples 1 mm thick from the fruit stalks were fixed for electron microscopy. Samples were also fixed and processed for electron microscopy from previously intact (non-exuding) fruit stalks. Examination of the sieve tubes from these two different samples showed predominantly open sieve-plate pores in the exuding fruit stalk. The sieve plates of the non-exuding fruit stalk showed occlusion of the sieve-plate pores by P-protein. The starch grains from the broken plastids also had characteristic distributions. The implications of these observations are discussed in relation to comprehending the mechanism by which sieve-plate pores become choked, and so sealing the sieve-tube system as a result of injury. 
ER  -

