Study of population dynamics of Clavibacter michiganensis subsp. michiganensis in exposed and buried crop debris
2019
Bibi, Ayesha | Junaid, Muhammad | Ahmad, Musharaf | Ali Shah, Syed Fayaz | Khalil, Iftikhar Hussain
The aims of the current work were to determine the effect of burial depth (0, 6, 12 and 18 cm) on thedegradation of diseased crop debris, and survival of the debris-borne bacterial inoculum. This study was carried outin two-locations namely; the Agricultural Research Institute, Tarnab, Peshawar, and the Haripur University, Haripurcampus, Pakistan. Results revealed that the debris degraded at faster rate and the number of bacteria per gram oftissue declined more in buried samples than in exposed samples. Moreover, the decline in number of bacteria wasmore at greater depths than at shallow ones; suggesting that the use of turn-over ploughs after harvest would behelpful in reducing the crop debris-borne primary inoculum, and hence reducing the disease incidence. During aperiod of 270 days, the mean number of cells of Clavibacter michiganensis subsp. michiganensis (Cmm)\ gram ofexposed stem tissue was reduced from 8.9×109to 6.0×105at ARI, Tarnab, and from 7.93×109to 5.26×105atHaripur. On the other hand, the mean number of cells\ gram of tissue at ARI, Tarnab buried at different soil depthsof 6, 12, and 18 cm, decreased from 9.05×109to 3.2×103, 8.55×109to 2.9×103, and 5.8×109to non-detectable;respectively, after 270 days of burial. Whereas at Haripur; the mean number of cells\ gram of tissue buried at thesame depths decreased from 4.28×109to 1.81×104, 4.46×109to 2.31×103, and 3.82×109to non-detectable,respectively, after the same period.
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