Abstract
Seed biometry and dormancy overcoming methods should be considered in the passion fruit production chain, in the seedling production stage, because of the different characteristics that condition the seedlings. The objective of this work was to identify and correlate the main biometric characteristics between seeds and seedlings and to select the best pre-germinative treatments in passion fruit hybrids. Seed length, width, thickness and weight were measured, and subsequently subjected to pre-germinative treatments, in a completely randomized design, in a 5 x 2 x 3 (GA3 concentrations x scarification x hybrids) factorial scheme. In the initial development of the seedlings, the length of the aerial part, the diameter of the stem and the number of leaves were evaluated. Pearson's correlation matrix was estimated between seed and seedling characters and, subsequently, path analysis. The Classification Sum Index was used for the means of the characters under pre-germinative treatment. The best pre-germinative treatment for BRS GA is scarification and soaking in 50 mg of GA3, for BRS SC, soaking in 100 mg of GA3, and for BRS RC, immersion in 50 mg of GA3. Seed morphometric selection is a technique that should be recommended to obtain quality seedlings.
Highlights
Knownas sour passion fruit, the commercial passion fruit has an expressive participation in the Brazilian market, allowing Brazil to stand out as the largest world’s producer (Faleiro & Junqueira, 2016)
The analysis of variance did not show a triple interaction between the factors evaluated, but there was a significant difference by the F test, demonstrating the existence of genetic variability
Significant interaction was observed between hybrid factors and scarification at 1% significance for all variables under study, as well as significant interaction between hybrids and GA concentration at 1%
Summary
Knownas sour passion fruit, the commercial passion fruit has an expressive participation in the Brazilian market, allowing Brazil to stand out as the largest world’s producer (Faleiro & Junqueira, 2016). In 2019, the cultivation of commercial species of passion fruit occupied a harvested area of 41,584 ha and produced 593,429 tons across the country (IBGE, 2020). The productivity achieved in the Brazilian orchards is very low (14.3 t ha-1) (IBGE, 2020) on average, considering that the species has a productive potential to reach more than 40 t ha-1 (Freitas et al, 2011). The number of available commercial passion fruit hybrids is reduced, hampering the access of the farmer to propagating material of high agronomic quality (Krause et al, 2012). Much remains to be reported on the productive behavior of this type of genetic material (Freitas et al, 2011)
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