The Plant Pathology Journal 2002;18(6):328-332.
Published online December 31, 2002.
Physiological and Morphological Aspects of Bipolaris sorokiniana Conidia Surviving on Wheat Straw
R. Chand, H. V. Singh, A. K. Joshi, E. Duveiller
Abstract
Wheat samples showing typical spot blotch symptoms on stems and sheaths were collected from the field after physiological maturity, and were sealed in paper bags and stored in the laboratory at room temperature to study the survival of Bipolaris sorokiniana conidia on wheat straw. The materials were observed at monthly intervals to assess the conidia viability during storage. After 4 months, the frequency of individual conidia already present on wheat straw at the time of sampling was reduced and appeared to be progressively replaced by the formation of round structures consisting of conidia aggregates. After 5 months, distinct, individual conidia were no longer detected, and only ``clumps of conidia`` were observed. These dark black aggregates or ``clumps of conidia`` measured 157-170 mm in diameter and were grouped into boat-shaped olivacious conidia showing thick wall and measuring 50-82
Key Words: Bipolaris sorokiniana, Cochliobolus sativus, conidia, dormancy, spot blotch, survival, viability
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