A Psorosis-Like Virus Causing Symptoms Only on Dweet Tangor
1968; Volume: 4; Issue: 4 Linguagem: Inglês
10.5070/c50bk3w8jr
ISSN0074-7203
AutoresC. N. Roistacher, Rupert Blue,
Tópico(s)Plant Virus Research Studies
ResumoMETHODS FOR detecting mild strains of citrus viruses were studied as part of the Variety Improvement Program of the Citrus Research Center, University of California, Riverside.Detection of very mild strains of virus has been enhanced by the use of a modified U.C. soil mix (3) to produce maximum plant growth free from patterns of nutrient deficiency or excess, and by supplemental lighting during the winter months (4).Investigations on indicators for concave-gum virus revealed that the Dweet tangor [Citrus reticulatu Blanco x C. sinensis (L.) Osb.] is a very efficient indicator for a mild strain of the virus and is also sensitive to psorosis-A and crinkly-leaf viruses (4).Despite a mild spotting that may appear on uninoculated seedlings, the superior sensitivity of Dweet tangor to psorosis-type viruses makes it a desirable indicator plant.After 1963, all new candidates entering the Variety Improvement Program were indexed on Dweet tangor, and over 150 candidates not previously indexed on Dweet were tested.One result of this re-indexing was detection of a psorosis-like mottle (Fig. l,A) on leaves of the Dweet indicator inoculated from a Cleopatra mandarin (C.reticulata Blanco) (CRC 270 in 8A-13-50).The parent tree showed no visible evidence of damage or decline due to virus infection, although the fruits were small, the twigs
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