Physiology of Rice Tungro Virus Disease: Involvement of Abscisic Acid-Like Substance in Susceptible Host-Virus Interactions |
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Authors: | SUSANTA K MOHANTY SANTOSH K MOHANTY A ANJANEYULU R SRIDHAR |
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Institution: | Department of Plant Pathology, Central Rice Research Institute, Cuttack 753 006, India |
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Abstract: | Stunting was severe in susceptible rice (Oryza saliva L.) cultivar ‘Taichung Native 1’ infected with tungro virus (RTV) compared to less-susceptible cultivar ‘IR 20’. The senescence of detached leaves of RTV-infected susceptible cultivar incubated in water in dark was accelerated compared to the healthy leaves as measured by the loss of total chlorophyll content. The transpiration rate of RTV-infected leaves of the susceptible cultivar was much lower than the healthy and RTV-infected leaves of the less-susceptible cultivar. Partially purified extracts obtained from RTV-infected leaves effectively inhibited GA-induced α-amylase synthesis in barley endosperms, and rice seedling growth, and they accelerated senescence of detached rice leaves. In all the three bibassays the ABA-like activity was significantly greater in the extracts from the RTV-infected susceptible cultivar than in extracts from the less-susceptible cultivar. |
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