scholarly journals Resistance to virus diseases of some F1 clones descended from the species hybridization Solanum demissum x S. tuberosum

1960 ◽  
Vol 32 (1) ◽  
pp. 73-80
Author(s):  
Onni Pohjakallio ◽  
Laura Karhuvaara
Keyword(s):  
Potato Plant ◽  
Tuber Formation ◽  
Solanum Demissum ◽  
Virus Diseases ◽  
Rate Of Development ◽  
Species Hybridization

The following are the main conclusions to be drawn from the results of experiments in which the resistance of F1 clones descended from the species hybridization Solanum demissum x S. tuberosum (Rosafolia) was investigated: The clones forming purple tubers appeared to be very susceptible to the potato rugose. Bud mutants descended from the former, forming white tubers, appeared to be wholly resistant to this virus. The virus accelerated the onset of tuber formation and the decline of the haulms of the susceptible F1 plants. The degeneration of the virus-diseased plants did not progress from one vegetative generation to the next; instead, the virus altered the rate of development of the potato plant to a new level.

scholarly journals Observations on the formation and growth of tubers on the potato plant.

1955 ◽  
Vol 3 (4) ◽  
pp. 291-304
Author(s):  
N. Krijthe
Keyword(s):  
Seed Potato ◽  
Potato Plant ◽  
General Scheme ◽  
Storage Condition ◽  
Tuber Formation ◽  
Tuber Growth ◽  
Seed Potatoes ◽  
The Relationship

An account is given of an investigation, to be continued for several years, on the relationship between chitting, number of sprouts on the seed potato and the grading of the harvested potatoes. The influence of the following treatments on tuber growth (one treatment per year) was studied: (1) methods of chitting; (2) size of seed potatoes and (3) storage condition. After the first fortnight's growth, whole, sample plants were lifted weekly to study the position of stolons on the stems, and the location of the largest and smallest tubers on the plant, the size of tuber being judged by its length. At each lifting, the relative positions of the largest, the smallest and of the medium-sized tubers were the same on each plant. These positions were approximately the same in different varieties of potatoes, and the general scheme is shown diagramatically. The treatments (1), (2) and (3) showed no significant effects on formation and growth of tubers provided the sprouts of the seed potatoes were the same length. The phenomenon of secondary-tuber formation is discussed.-D.B. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Regulation of Tuber Formation in the Potato Plant

1962 ◽  
Vol 15 (3) ◽  
pp. 413-419 ◽  
Author(s):  
Yozo Okazawa ◽  
Harold W. Chapman
Keyword(s):  
Potato Plant ◽  
Tuber Formation

Search mode for rapid detection of virus particles

1991 ◽  
Vol 49 ◽  
pp. 286-287
Author(s):  
O. E. Bradfute
Keyword(s):  
Electron Microscopy ◽  
Rapid Detection ◽  
Plant Virus ◽  
Low Dose ◽  
Search Mode ◽  
Virus Diseases ◽  
Virus Particles ◽  
Focus Image ◽  
Time Required ◽  
Rapid Switching

Electron microscopy is frequently used in preliminary diagnosis of plant virus diseases by surveying negatively stained preparations of crude extracts of leaf samples. A major limitation of this method is the time required to survey grids when the concentration of virus particles (VPs) is low. A rapid survey of grids for VPs is reported here; the method employs a low magnification, out-of-focus Search Mode similar to that used for low dose electron microscopy of radiation sensitive specimens. A higher magnification, in-focus Confirm Mode is used to photograph or confirm the detection of VPs. Setting up the Search Mode by obtaining an out-of-focus image of the specimen in diffraction (K. H. Downing and W. Chiu, private communications) and pre-aligning the image in Search Mode with the image in Confirm Mode facilitates rapid switching between Modes.

Virus Diseases of the Respiratory Tract

1950 ◽  
Vol 34 (6) ◽  
pp. 1637-1652
Author(s):  
Thomas M. Durant ◽  
Charles R. Shuman
Keyword(s):  
Respiratory Tract ◽  
Virus Diseases
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