Table 2.

Capacity of specific cucurbit phloem sap proteins to interact with plasmodesmata to induce an increase in SEL and mediate their own cell-to-cell transport in cotyledons of C. maxima

Injected material	Protein concentration,* μg⋅μl−1	Microinjections†
LYCH	—	15 (15; 100%)
20-kDa FITC-dextran	—	0 (15; 0%)
17-kDa protein fraction‡	0.6	12 (17; 71%)
24-kDa protein fraction	1.0	14 (15; 93%)
30-kDa protein fraction	1.5	11 (14; 79%)
40-kDa protein fraction	1.4	5 (16; 31%)
52-kDa protein fraction	1.2	12 (15; 80%)

^*Represents phloem sap protein concentration back-loaded into the microinjection pipette. 

^†Details as in Table 1. 

^‡Each protein fraction was coinjected with 20-kDa FITC-dextran.