| Front | physical defenses of plants 4.1.1(c) |
|---|---|
| Back | physical defenses - when attacked, high levels of polysaccharide callose (made of beta 1,3 and 1,6 linkages)produced between glucose - soon after attack, callose synthesised, deposited between cell walls and cell membrane in cells next to infected cells, which acts as barriers to prevent pathogens entering plant cells around site of infection - large amounts continue to be deposited, lignin added (barrier stronger now) - callose blocks sieve plates in phloem, seeling off infected part and prevent spread of pathogens - deposited in plasmodesmata between infected cells and neighbours, sealing them off for healthy cells and preventing spread |
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