Name: HÉRICA CHISTÉ
Publication date: 20/08/2021
Advisor:
Name |
Role |
|---|---|
| EDILSON ROMAIS SCHMILDT | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| ANDREIA BARCELOS PASSOS LIMA GONTIJO | Internal Examiner * |
| EDILSON ROMAIS SCHMILDT | Advisor * |
| SARA DOUSSEAU ARANTES | Internal Examiner * |
Summary: The genetic variability between clones, the season in which the cuttings are collected
and the low concentration of endogenous auxin are determining factors for the rooting
and quality of conilon coffee seedlings. In this context, the objective was to evaluate
the interaction between different concentrations of auxin on the quality of seedlings of
five genotypes of conilon coffee collected in summer and winter. The experiment was
carried out in a nursery, located at the Experimental Farm of Linhares - ES, between
the months of June to November and December to May, winter and summer
respectively. The experiment was carried out in a randomized block design in a split
plot scheme with four replications of 27 plants, with 14 useful plants in the plot, totaling
108 seedlings per treatment. The plot consisted of five genotypes (A1, LB1, 143, 02
and 748) and indole-3-butyric acid concentrations (0, 500, 1000, 1500 and 2000
mg Lିଵ) and the sub plot constituted by two seasons of cuttings collection (summer
and winter). In the R software, correlation was performed using the Pearson method,
considering the p-value at a significance level of 0.05 and the creation of the correlation
matrix in the Corrplot package. Analysis of variance was performed using the Sisvar
statistical program, and when significant, the means were compared using the Scott
Knott test at 5% probability. Quantitative regression analyzes were performed to obtain
the adjustment equations of the mathematical models. The quality of conilon coffee
seedlings is influenced by the time of cuttings collection, by the genotype and by the
dose of IBA. Cuttings collected in winter have a lower capacity for shoot formation and
AIB promoted an improvement in the performance of less vigorous genotypes. The
formation of the aerial part of seedlings of genotype 748 is inhibited by 72% in cuttings
collected in winter, and at the point of greatest efficiency at the dose of 726 mg L^(-1)
of IBA promotes an increase of 29.40% in length. Of the stem. The seedlings of
genotype 143 have reduced development of the shoot genotype and the season has
no influence, however, the AIB promoted an improvement in the performance in
cuttings collected in the summer with the highest efficiency point at the dose 959 mg
vii
Lିଵ). The genotypes A1, 02 and LB1 had very similar responses for both the time of
collection of cuttings and the doses of IBA. No differences were detected in the length
of the longest root of the conilon coffee genotypes as a function of IBA doses applied,
with mean values of 19.75 cm, concerning MSR, the changes as a function of IBA
doses were not sufficient for statistical significance. It is concluded that the genotype
and the time of collection of the cuttings are the most determining factors in the quality
of the seedlings of the conilon coffee tree. Cuttings collected in winter have a lower
capacity for aerial part formation. AIB promotes improvement in the growth of less
vigorous genotypes.
