Shoot growth restriction in dry matter partitioning andminituber production of potato plants

• Autor(a) principal: Bisognin,Dilson Antônio
• Data de Publicação: 2015
• Outros Autores: Dellai,Jacso
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Ciência Rural
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001101917
• topic: Solanum tuberosum L.; leaf area; plant propagation; cuttings; tuber seeds

The aim of this research was to determine the effect of shoot growth restriction in the dry matter partitioning and minituber production of potato plants grown in a closed soilless system. Minitubers of the cultivars 'Macaca' and 'Asterix' were planted in the greenhouse in the density of 100 hills m-2, during autumn and spring growing seasons. Growth restriction levels were gotten by pruning shoots at 10, 20 and 30cm height or without pruning. The growth restriction levels were identified by their respective leaf area index. The experiment was a factorial (cultivars x growth restriction x growing season) in a random design, with four replications. Growth restriction affected the dry matter production of potato plants in both growing seasons and cultivars. Pruning potato plants at 30cm is a feasible technique to control leaf area index and it has lower effect on harvest index and number than in dry matter production of minitubers. Growth restriction does not change dry matter partitioning of potato plants grown in soilless system.