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Evaluation of the blackberry germplasm (Rubus spp.) frost resistance at the Research Institute for Fruit Growing Pitesti

Author(s): Paulina Mladin | Emil Chitu | Viorica Chitu | Gheorghe Mladin

Journal: Scientific Papers of the Research Institute for Fruit Growing Pitesti, Romania
ISSN 1584-2231

Volume: XXVI;
Start page: 1;
Date: 2010;
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Keywords: Variety | Selection | Hybrid | Minimum temperature | Damaged canes

The study concerns the evaluation of damage caused by strong frosts in the winter 2009-2010 to the blackberry plants in the experimental field of the RIFG Pitesti-M ă r ă cineni. There were taken under study 42 blackberry genotypes of the Institute collection, 11 selections originated from 6 hybrid combinations made in 2000 and 350 hybrids resulted from the 15 hybrid combinations, made in 2002. The objective of the work was to evaluate and identify genotypes with genetic resistance to negative temperatures extremely severe (-24.4 ˚ C in air and -25.5°C on snow surface) knowing that the threshold resistance of the thornfree blackberry is the minimum temperature -14° .. -15°C and of the thorny ones -17°.. -18°C. The goal was to introduce the most resistant genotypes as basic genitors in the breeding program for the improving the frost resistance of the varieties and to promote them in culture. The evaluation was done on the stems, buds and shoots of plants in the bud-break and growth of fruiting shoots phenophases. It was found that the most varieties, selections and hybrids with semierect and erect habit were strongly damaged, with some exceptions that will be presented below, while the least affected were those with creeping habit and stems bent to the ground soil. Of all the genotypes Wilson Early variety, selections ARK 613 and ARK 609, 2 / 21 and hybrids : N x A-T 12, H -N1, H T4-R3, N x H-2/11 ş i N x H 2/T 13 were found to have high degree resistance to the extremely frosts of the 2009-2010 winter.
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