Correlation between morphoagronomic traits and resistance to ethylene action in ornamental peppers

• Published in: Horticultura brasileira 2015-06, Vol.33 (2), p.151-154
• Main Authors: Nascimento, Mayana F, Rêgo, Elizanilda R, Nascimento, Naysa FF, Santos, Rusthon MC, Bruckner, Claudio H, Finger, Fernando L, Rêgo, Mailson M
• Format: Magazinearticle
• Language: English
• ISSN: 0102-0536; 0102-0536
• DOI: 10.1590/S0102-053620150000200003

The post-production quality of ornamental peppers can be shorted due to exposure to ethylene. The concentration of this phytohormone at 10 µL/L induces leaf, fruit and flowers abscission, ripening of climacteric fruits, organ senescence, seed germination and seedling growth. We evaluated the correlation between pepper morphoagronomic traits and resistance to ethylene on ornamental peppers. Two genotypes, one resistant (UFPB 132), a susceptible (UFPB 134), and two hybrids (DR x PN) were utilized (76 x PN) to assess the susceptibility or resistance to ethylene. The experimental design was completely randomized, with four replications. First, 19 morphoagronomic characteristics were analyzed when the plants had 30% of fruits at the ripe stage. At this stage, the pots were transferred to a room at 25oC with 8-10 µmol/s/m2 of white fluorescent light. Afterwards, the pots were placed in a 60-L container and treated with ethylene at final concentration of 10 µL/L. The plants were exposed to ethylene for 48 hours and then kept at room temperature for further analysis. Afterwards, the number of leaves and fruits was determined at time zero and after 144 hours after end of the ethylene treatment. The Pearson correlation was calculated for each pair of variables and submitted to t-test (p≤0.05). We observed high occurrence of a significant positive correlation (>0.95) between leaf abscission and the anther length, major fruit width, pedicel length, pericarp thickness and dry matter content of the fruits. No significant correlation between fruit abscission and morphological evaluated variables was found. These results show the possibility to use morphological measurements to select plants resistant to leaf abscission induced by ethylene, while for the abscission of fruits, No relation to the morphological parameters evaluated in this experiment was possible to be established. A qualidade pós-produção das pimentas ornamentais pode ser encurtada devido à exposição ao etileno. A concentração de etileno de 10 µL/L no ambiente já induz a abscisão de folhas, o abortamento de frutos e flores, o amadurecimento de frutos climatéricos e a senescência de órgãos, prejudicando a comercialização dos produtos. O objetivo deste trabalho foi determinar a existência de correlação entre características morfológicas da pimenteira ornamental e a resistência das plantas à queda de folhas e frutos pela ação do etileno. Foram utilizados três genótipos resistentes, um acesso (UFPB 132) e dois