Viability and meiotic index of <i>Ochroma pyramidale</i> from the Brazilian Amazon

Zanetti, Géssica Tais; Rossi, Ana Aparecida Bandini; Zortéa, Kelli Évelin Müller; Lima, Joameson Antunes; Silva, Maurecilne Lemes da; Behling, Maurel; Hoogerheide, Eulalia Soler Sobreira

doi:10.1590/1983-40632025v5582152

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Research Article • Pesqui. Agropecu. Trop. 55 • 2025 • https://doi.org/10.1590/1983-40632025v5582152 linkcopy

Viability and meiotic index of Ochroma pyramidale from the Brazilian Amazon

Viabilidade e índice meiótico de Ochroma pyramidale da Amazônia brasileira

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Ochroma pyramidale is a neotropical tree species native to Central and South America, occurring naturally in the Brazilian Amazon and cultivated in the Mato Grosso state, Brazil, where it is used for timber production and ecological restoration. This study aimed to investigate the pollen viability and meiotic behaviour of O. pyramidale (Cav. ex Lam.) Urb., factors that directly influence the species’ reproductive success. Flower buds at various developmental stages were collected from six individuals to assess the pollen grain morphology, pollen viability and meiotic index. The pollen viability (mean values of 96.16 and 97.72 %, using acetocarmine and the Alexander’s stain, respectively) and meiotic index (average of 96.53 %) were high across all individuals, presenting regularity and stability in the meiosis process.

KEYWORDS:
Balsa wood; pollen grains; meiotic stability

Measurement	Min-Max (μm)	x ± sx (μm)	CI 95% (μm)	CV (%)
Equatorial diameter (equatorial view)	188.51-225.79	207.33 ± 9.16	203.26-210.54	4.42
Polar axis (equatorial view)	157.98-183.2	168.31 ± 7.68	171.39-164.30	4.56
Equatorial diameter (polar view)	224.75-179.45	194.77 ± 11.82	189.52-199.5	6.06
Nexine	2.17-4.74	3.40 ± 0.65	3.11-3.06	19.27
Sexine	3.5-6.47	4.65 ± 0.72	4.33-4.94	15.57
Exine	5.67-11.21	8.06 ± 1.24	7.50-8.55	15.40
Polar axis/equatorial diameter ratio	0.75-0.91	0.81 ± 0.04	0.79-0.83	5.91
Polar area index	0.56-0.71	0.66 ± 0.03	0.65-0.67	4.58

Individual	Tetrads	Monads	Dyads	Triads	Polyads	Meiotic index (%)
SP01	2,382	0	0	18	0	99.25 (0.84)*
SP02	2,381	2	6	10	1	99.21 (0.53)
SP03	2,360	7	16	17	0	98.33 (0.87)
IT04	2,358	15	11	16	0	98.21 (1.33)
IT05	2,386	0	0	14	0	99.42 (0.49)
AF06	2,206	0	15	178	1	91.92 (3.68)
Total	14,073	24	48	253	2	-
Mean	2,345.5	4	8	42.16	0.33	97.72
CV (%)	1.74

Source of variation	DF	MS
Dyes	1	58.1*
Individuals	5	390.7**
Dyes x individuals	5	67.4ns
Mean	96.95 %

Individual	Pollen viability (%)
Individual	2 % acetic carmine	Alexander’s stain
SP01	98.54 (0.90)	98.83 (1.08)*
SP02	94.92 (4.43)	98.38 (0.70)
SP03	94.04 (3.10)	97.92 (0.83)
IT04	92.71 (5.54)	93.54 (3.20)
IT05	97.33 (0.83)	99.04 (0.54)
AF06	99.42 (0.33)	98.58 (0.41)
Mean (%)	96.16	97.72
CV (%)	4.78	2.7

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Escola de Agronomia/UFG Caixa Postal 131 - Campus II, 74001-970 Goiânia-GO / Brasil, 55 62 3521-1552 - Goiânia - GO - Brazil
E-mail: revistapat.agro@ufg.br

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[tn1] x: mean; sx: standard deviation; CI 95 %: confidence interval; CV: coefficient of variation.