Produção de platycodon em vaso em resposta a paclobutrazol

Sabino, João Henrique Ferreira; Grossi, José Antonio Saraiva; Silva, Toshik Iarley da; Verly, Otávio Miranda; Martins Filho, Sebastião; Barbosa, José Geraldo

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Pesquisa Agropecuária Tropical

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Research Article • Pesqui. Agropecu. Trop. 51 • 2021 • https://doi.org/10.1590/1983-40632021v5168949 copiar

Produção de platycodon em vaso em resposta a paclobutrazol

Autoria SCIMAGO INSTITUTIONS RANKINGS

RESUMO

Platycodon grandiflorus é uma espécie ornamental que pode ser comercializada como flor de vaso; porém, apresenta ramos florais frágeis e pendentes. Reguladores de crescimento, como o paclobutrazol, são compostos que reduzem o alongamento do caule, permitindo a produção de plantas com formação mais compacta. Objetivou-se avaliar os efeitos de paclobutrazol no crescimento de platycodon, em casa-de-vegetação. O delineamento experimental foi em blocos inteiramente casualizados, em esquema fatorial 4 × 5, com quatro repetições. Os tratamentos consistiram de quatro variedades de platycodon ‘Astra Semi-Double’ (Blue, Lavender, Pink e White) e cinco doses de paclobutrazol (0; 1,25; 2,5; 3,75; e 5,0 mg vaso^-1). A aplicação de paclobutrazol não afetou o diâmetro do caule, número de folhas, dias até a antese, número de flores ou botões florais e diâmetro da flor. O comprimento da parte aérea, área foliar e massa seca da parte aérea decresceram com o aumento da dose do regulador de crescimento. Lavender apresentou os maiores valores de comprimento da parte aérea, número de folhas, área foliar e massa seca da parte aérea. Pink teve a antese mais precoce, seguida de Blue e White, enquanto Lavender teve a antese mais tardia. A dose de 3,75 mg vaso^-1 de paclobutrazol eficientemente controlou o crescimento e melhorou a qualidade visual de todas as variedades de platycodon.

PALAVRAS-CHAVE:
Platycodon grandiflorus (Jacq.) A; DC; flor-balão; regulador de crescimento vegetal

Sources of variation	SL	SD	NL⁽¹⁾	A	NF	FD	LA⁽¹⁾	SDM	LDM	TDM⁽²⁾
Sources of variation	(cm)	(mm)	NL⁽¹⁾	(days)	NF	(cm)	(cm²)	(g)	(g)	(g)
VAR (F_c)	36.90^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	6.30^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	33.38^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	81.94^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	3.94^* * p-value < 0.05;	9.77^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	20.96^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	14.76^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	23.06^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.	7.26^ p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.(1) Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.(2) Includes the dry mass of stem, leaves, flowers and flower buds.
Blue	17.92 b	6.05 b	9.53 b	70.65 b	20.95 b	7.00 a	21.36 b	0.81 b	1.71 b	3.94 b
Lavender	21.11 a	5.98 b	12.21 a	75.90 a	26.05 a	7.07 a	24.69 a	1.13 a	2.20 a	4.63 a
Pink	16.75 b	6.90 a	9.59 b	63.85 c	21.70 b	6.43 b	20.09 b	0.83 b	1.52 b	3.86 b
White	17.17 b	6.61 ab	9.48 b	69.05 b	23.05 ab	6.10 b	20.02 b	0.81 b	1.50 b	3.75 b
PBZ
0	20.07	6.03	10.26	68.18	23.00	6.67	23.82	1.01	1.95	4.46
1.25	18.91	6.38	10.39	70.00	23.25	6.68	21.56	0.94	1.78	4.25
2.50	18.35	6.62	10.24	70.50	23.75	6.83	21.59	0.92	1.77	4.15
3.75	16.84	6.43	10.14	70.12	23.31	6.40	20.06	0.79	1.57	3.68
5.00	17.02	6.46	9.97	70.50	21.37	6.66	20.71	0.85	1.61	3.72
VAR × PBZ (F_c)	0.71^ns ns p-value > 0.05;	1.21^ns ns p-value > 0.05;	0.76^ns ns p-value > 0.05;	1.64^ns ns p-value > 0.05;	1.11^ns ns p-value > 0.05;	0.90^ns ns p-value > 0.05;	1.23^ns ns p-value > 0.05;	0.67^ns ns p-value > 0.05;	0.88^ns ns p-value > 0.05;	1.15^ns ns p-value > 0.05;
CV (%)	7.98	12.31	10.14	3.51	22.08	10.02	9.91	20.53	17.55	16.38

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[TFN1] F_c: F calculated value (

[TFN2] ^ns
p-value > 0.05;

[TFN3] ^*
p-value < 0.05;

[TFN4] ^**
p-value < 0.001). Means followed by the same letter in the column do not differ by the Tukey test, at 5 % of probability.⁽¹⁾ Data transformed into their square roots (y = √x) to attend the normality premise of the analysis of variance.⁽²⁾ Includes the dry mass of stem, leaves, flowers and flower buds.