The productivity of disease-free plants
2000
Saerekanno, M. (Estonian Agricultural Univ., Tartu (Estonia). Plant Biotechnological Research Centre EVIKA)
The potato, a vegetatively propagated crop, requires healthy disease-free planting material. At present the in vitro plantlets and microtubers are commonly used for speeding up multiplication at the start of seed program. The effectiveness, energy expenditure, and the degree of pollution of the environment differ much in each method. The technology created in EVIKA for multiplication of disease-free potato plants in plastic rolls and growing of the first tuber generation in the field has justified itself well in practice. The multiplied plants are not always with the same productivity and seed tubers with uniform size. In the test-fields of the first generation the influence of 3 multiplication methods, 5 planting densities and 3 genotypes on the number and size of seed tubers were studied. The amount of tubers per plant and size were statistically credibly influenced by the method of propagation and the planting density. By increasing the planting density in the field the number of tubers per plant and size were decreased. The plants obtained in vitro had 6.8 - 14.7 and in plastic rolls 3.7 - 8.2 tubers per plant. For all tested varieties the optimal planting density turned out to be 20 - 25 x 70 cm
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