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Articles by V. Pensuk
Total Records ( 2 ) for V. Pensuk
  W. Pimsaen , S. Jogloy , B. Suriharn , T. Kesmala , V. Pensuk and A. Patanothai
  Inulin containing tubers of Jerusalem artichoke (Helianthus tuberosus L.) can be used as raw material for healthy products, sweeteners, bio-ethanol and animal feed. The objective of this study was to evaluate the effects of cultivar, environment and cultivarxenvironment interaction on fresh tuber yield tuber number and tuber size of Jerusalem artichoke. Fifteen cultivars were evaluated in a randomized complete block design with four replications at nine environments in the Northeast of Thailand. Differences among cultivars were observed for fresh tuber yield, tuber number and weight of individual tubers (tuber size). Environment effect contributed to a larger portion of variations in fresh tuber yield, tuber number and tuber size. Although, genotypex environment interactions were also significant, their values were much smaller than genotype main effects for all characters. Stability parameters indicated that exploitation of superior cultivars with adaptation to a wide range of environments and the cultivars with specific adaptation to specific environments would be possible. Low correlation but significant was found for fresh tuber yield and tuber number, indicating that tuber yield in some cultivars was dependent on high tuber number. Strong correlation between fresh tuber yield and tuber size indicated that bigger tuber is necessary to obtain higher tuber yield. Negative but significant correlation between tuber number and tuber size indicated that increased tuber size is on the expense of tuber number. JA 89 was the most promising cultivar for wide adaptation and high tuber yield, whereas HEL 65 was the most promising cultivar for its bigger tubers and acceptable yield.
  V. Pensuk , S. Jogloy and A. Patanothai
  The difference in PBND incidence in the rainy and dry seasons in Thailand has led to a hypothesis that temperature and relative humidity might be the causal factors. The objective of this study was to investigate the effects of temperature and relative humidity on the effectiveness of mechanical inoculation of PBNV on peanut. Two experiments were conducted in the rainy and dry seasons during 2004 to 2005, using the susceptible peanut genotype Tainan 9. The first experiment evaluated the effect of low temperature on the effectiveness of PBNV transmission by mechanical inoculation. The second experiment compared two temperature and relative humidity conditions in the rainy season and in the dry season. The results showed that exposing the PBNV-inoculated plants to low temperature (25°C, 90% RH) during a 12 h light period and 20°C, 90% RH during a 12 h dark period) for all the time during the experimental period did not increase the infected plants. Two climate conditions representing the dry season (daytime, 32°C, 44% RH, night-time, 22°C, 65% RH) and the rainy season (daytime, 36°C, 46% RH, night-time, 25°C, 70% RH) in Thailand also showed no difference in the infected plants. These results indicated that low temperature or relative humidity did not affect the transmissibility of PBNV. The difference in disease incidences in the rainy and the dry seasons in Thailand could not be explained by the difference in climatic conditions but could possibly be accounted for by the difference in vector infestation.
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