Systemic development of the pathogen from root infection
1996
Matana Srihuttagum | Charas Kitbamroong | Pornpudh Prasertkul (Department of Agriculture, Bangkok (Thailand). Chai Nat Field Crops Research Center)
Results revealed that M. phaseolina from diseased roots invaded the stem tissues systemically and intracellularly at the rate of 4.4 centimeters a day. Its mycelia were located mostly in the xylem, phoem and pith but rarely in cortex. They could invade upward the top end of the plant and some pod stalks since soil moisture was reduced to 57 percent WHC. However, no seed was found infected at any investigating times. The reduction of soil moisture to 57 percent WHC had an overwhelming effect to the diseased plants and made them succumb to the disease. At this stage, pathogen mycelia could spread throughout the stem resulted in abrupt death of the entire diseased plants within 1-2 days. The abrupt death of the entire diseased plants at the same time terminated growth and activities of the pathogen. Mycelia formed sclerotia and could not infect the pod, therefore, seeds were free from infection. In contrast, under soil water which was flavoured to growth of the plants, at 60 percent WHC, the plants grew vigorously and could highly resist to the onset of the pathogen mycelia. So they could not reach the pod and seeds before they were mature and dry out.
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