Rhizobium infection involves colonization of roots, attachment to root hairs, invasion causing curling, formation of an infection thread to transport bacteria into the cortex, initiation of nodule formation, release into cells, differentiation into nitrogen-fixing cells, and establishment of a direct vascular connection with the host.
Explain the process of rhizobium infection: 1 rhizobium multiply and colonize the surroundings of the root. 2 the rhizobia get attached to the epidermal and root hair cells. 3 the root hairs curl and the bacteria invade the root hair. 4 infection thread is produced carrying the bacteria into the cortex of the root. 5 in the cortex of the root, they INITIATE NODULE FORMATION. 6 bacteria are NOW Released from the thread INTO the cells. 7 THIS leads to the DIFFERENTIATION of specialised nitrogen fixing cells. 8 The nodule thus formed establishes a DIRECT VASCULAR CONNECTION with the host for exchange of nutrients.
| Front | explain the process of rhizobium infection |
|---|---|
| Back | 1 rhizobium multiply and colonize the surroundings of the root 2 the rhizobia get attached to the epidermal and root hair cells 3 the root hairs curl and the bacteria invade the root hair 4 infection thread is produced carrying the bacteria into the cortex of the root 5 in the coetex of the root, they INITIATE NODULE FORMATION 6 bacteria are NOW Released from the thread INTO the cells 7 THIS leads to the DIFFERENTIATION of specialised nitrogen fixing cells 8 The nodule thus formed establishes a DIRECT VASCULAR CONNECTION with the host for exchange of nutrients |
Tags: neet-biology::unit-4::mineral-nutrition
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