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Microsporogenesis and flower development in Eucalyptus urophylla × E. tereticornis.

Yang J, Kang X - Breed. Sci. (2015)

Bottom Line: We compared microsporogenesis and flower development in Eucalyptus urophylla × E. tereticornis.The flower buds grew on the lower side of the branch and showed greater increases in diameter.Thus, the start of microsporogenesis in E. urophylla × E. tereticornis could be determined, which may be applicable to future breeding studies.

View Article: PubMed Central - PubMed

Affiliation: National Engineering Laboratory for Tree Breeding, Beijing Forestry University , Beijing 100083 , P R China ; Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants, Ministry of Education, Beijing Forestry University , Beijing 100083 , P R China.

ABSTRACT
We compared microsporogenesis and flower development in Eucalyptus urophylla × E. tereticornis. In this study, although microsporogenesis and cytokinesis occurred simultaneously during meiosis of pollen mother cells, we observed a strong asynchronism in different anthers from a flower bud. The developmental period of microsporogenesis in anthers originated from the long thrum before the short thrum. Flower development was also asynchronous at different locations on a branch. The flower buds grew on the lower side of the branch and showed greater increases in diameter. In addition, we observed a relationship between microsporogenesis development and flower bud diameter growth. Generally, when the pachytene stage was first observed in a small single flower bud growing on top of a flowering branch, the remaining microsporogenesis stages (from diplotene to tetrad) in the whole branch occurred over the next 5-9 days. Thus, the start of microsporogenesis in E. urophylla × E. tereticornis could be determined, which may be applicable to future breeding studies.

No MeSH data available.


Mean diameters of umbels from different locations on different days.
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Related In: Results  -  Collection

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f3-65_138: Mean diameters of umbels from different locations on different days.

Mentions: When the microsporogenesis was observed for the first time (Day 1), the mean diameter and the location serial number of each umbel from a large selected flower branch was recorded over 21 days, and data from days 1, 5, 7, 9, 14, and 21 were used to analyze flower growth and development. The results showed that umbels according to their locations were at different development stages of growth at the same time (Fig. 3). The majority of umbels (with Arabic serial numbers) on the lower locations of a small branch grew larger than the upper locations. The maximum interpolation of mean diameter in the same small branch was greater than 1.00 mm (umbels b1 and b4 on day 1). However, the umbel sizes between small branches (with lowercase serial letters) from a selected large branch differed. In addition, they did not show the same role as the umbels growing on the same small branch. The umbels from branch c grew bigger than those on branch a, but grew lower than those on branch a (on day 1, 5, 7, 9, 14, and 21).


Microsporogenesis and flower development in Eucalyptus urophylla × E. tereticornis.

Yang J, Kang X - Breed. Sci. (2015)

Mean diameters of umbels from different locations on different days.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4430506&req=5

f3-65_138: Mean diameters of umbels from different locations on different days.
Mentions: When the microsporogenesis was observed for the first time (Day 1), the mean diameter and the location serial number of each umbel from a large selected flower branch was recorded over 21 days, and data from days 1, 5, 7, 9, 14, and 21 were used to analyze flower growth and development. The results showed that umbels according to their locations were at different development stages of growth at the same time (Fig. 3). The majority of umbels (with Arabic serial numbers) on the lower locations of a small branch grew larger than the upper locations. The maximum interpolation of mean diameter in the same small branch was greater than 1.00 mm (umbels b1 and b4 on day 1). However, the umbel sizes between small branches (with lowercase serial letters) from a selected large branch differed. In addition, they did not show the same role as the umbels growing on the same small branch. The umbels from branch c grew bigger than those on branch a, but grew lower than those on branch a (on day 1, 5, 7, 9, 14, and 21).

Bottom Line: We compared microsporogenesis and flower development in Eucalyptus urophylla × E. tereticornis.The flower buds grew on the lower side of the branch and showed greater increases in diameter.Thus, the start of microsporogenesis in E. urophylla × E. tereticornis could be determined, which may be applicable to future breeding studies.

View Article: PubMed Central - PubMed

Affiliation: National Engineering Laboratory for Tree Breeding, Beijing Forestry University , Beijing 100083 , P R China ; Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants, Ministry of Education, Beijing Forestry University , Beijing 100083 , P R China.

ABSTRACT
We compared microsporogenesis and flower development in Eucalyptus urophylla × E. tereticornis. In this study, although microsporogenesis and cytokinesis occurred simultaneously during meiosis of pollen mother cells, we observed a strong asynchronism in different anthers from a flower bud. The developmental period of microsporogenesis in anthers originated from the long thrum before the short thrum. Flower development was also asynchronous at different locations on a branch. The flower buds grew on the lower side of the branch and showed greater increases in diameter. In addition, we observed a relationship between microsporogenesis development and flower bud diameter growth. Generally, when the pachytene stage was first observed in a small single flower bud growing on top of a flowering branch, the remaining microsporogenesis stages (from diplotene to tetrad) in the whole branch occurred over the next 5-9 days. Thus, the start of microsporogenesis in E. urophylla × E. tereticornis could be determined, which may be applicable to future breeding studies.

No MeSH data available.