Thidiazuron effects on shoot growth, return bloom, fruit set and nutrition of apples

Pesquisa Agropecuária Brasileira

Cassandro Vidal Talamini Do Amarante²  Paulo Roberto Ernani¹  Luiz Eduardo Bassay Blum²  Clarice Aparecida Megguer² 

[1] ,Universidade do Estado de Santa Catarina (Udesc) Universidade do Estado de Santa Catarina (Udesc) Lages SC

关键词: Malus domestica;    cytokinin;    phenylurea;    calcium;    fruit yield;    pollination;    plant development;    Malus domestica;    citocinina;    difenil uréia;    cálcio;    rendimento de frutos;    polinização;    desenvolvimento das plantas;   

DOI  :  10.1590/S0100-204X2002001000003

来源: SciELO

【 摘 要 】

Apple (Malus domestica Borkh.) trees, cultivars Gala and Fuji, were sprayed at full bloom with thidiazuron (TDZ) at doses of 0, 5, 10, or 20 g ha-1 of a.i. in order to evaluate its effects on plant growth and development, return bloom, fruit set, nutrition, and fruit yield. Fruit set increased with TDZ dose in 'Gala' but not in 'Fuji'. TDZ did not affect fruit yield in any cultivar. In 'Gala', the return bloom was reduced in about 50% at TDZ doses of 10 or 20 g ha-1. TDZ increased shoot growth in both cultivars. In leaves, TDZ decreased the concentration of Ca and Mg in 'Gala' and of Mg in 'Fuji', but did not affect the chlorophyll content, leaf area, length, width, and dry mass per cm² regardless of cultivar. In fruits, the effect of TDZ varied according to the portion evaluated. Highest doses of TDZ decreased the concentration of Ca and K in 'Gala' and of K in 'Fuji' in the entire fruits (flesh + skin); in the skin, highest doses of TDZ reduced the levels of N, Ca, and Mg in both cultivars, in addition to the level of K in 'Fuji'.

【 授权许可】

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