Effect of some environmental factors on the asexual phase of Peronosclerospora sorghi

Shekara Shetty, H. ; Safeeulla, K. M. (1981) Effect of some environmental factors on the asexual phase of Peronosclerospora sorghi Proceedings of the Indian Academy of Sciences - Plant Sciences, 90 (1). pp. 45-51. ISSN 0253-410X

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Official URL: http://www.ias.ac.in/j_archive/procb/90/vol90conte...

Related URL: http://dx.doi.org/10.1007/BF03052896


Peronosclerospora sorghi, produced a maximum of 10,800 conidia/cm2 of diseased sorghum leaves at 100% relative humidity but only about 3600 conidia at 85% relative humidity underin vitro conditions. The sporulation was totally inhibited at 80% relative humidity and below. Infected sorghum leaves kept in darkness after completion of the previous crop of the spores, did not sporulate in continuous darkness even at the optimum relative humidity and temperature. Optimum temperature for sporulation is 21-23°C, 31°C and 30°C are minimum and maximum respectively. At 26°C and above, conidiophores were malformed and produced only a few conidia. For conidial germination, 21-25°C were optimum while at 13°C conidial germination was as low as 52%. At 32°C, 80% germination was recorded but 35°C and above no germination occurred. After inoculation with conidial suspension, a minimum of 3 hr moisture was essential to induce systemic infection.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Peronosclerospora sorghi; Sorghum Downy Mildew; Epidemiology; Asexual Phase; Environment
ID Code:48587
Deposited On:14 Jul 2011 14:04
Last Modified:14 Jul 2011 14:04

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