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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.


The ratio of each meiosis period on different days.
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f5-65_138: The ratio of each meiosis period on different days.

Mentions: Studies on other species of trees demonstrated that the suitable period of high-temperature treatment to induce 2n gametes was between diakinesis and metaphase I (Kang et al. 2000, Lu et al. 2013, Mao et al. 2013). In E. urophylla × E. tereticornis, the percentage of each meiotic stage in a branch containing multiple sizes of flowers buds were different on different days (Fig. 5). The leptotene stage was first observed in the smallest flower bud as a starting point, and meiosis in this whole branch likely occurred over the next 5–9 days. Diplotene to diakinesis stages in the whole branch accounted for 36.00%, 26.00%, and 25.91% of developmental stages on day 5, 7, and 9, respectively. That may be the most suitable period for treatment. Due to asynchronous meiosis between stamens in a flower, this period may be longer than expected.


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

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

The ratio of each meiosis period on different days.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5-65_138: The ratio of each meiosis period on different days.
Mentions: Studies on other species of trees demonstrated that the suitable period of high-temperature treatment to induce 2n gametes was between diakinesis and metaphase I (Kang et al. 2000, Lu et al. 2013, Mao et al. 2013). In E. urophylla × E. tereticornis, the percentage of each meiotic stage in a branch containing multiple sizes of flowers buds were different on different days (Fig. 5). The leptotene stage was first observed in the smallest flower bud as a starting point, and meiosis in this whole branch likely occurred over the next 5–9 days. Diplotene to diakinesis stages in the whole branch accounted for 36.00%, 26.00%, and 25.91% of developmental stages on day 5, 7, and 9, respectively. That may be the most suitable period for treatment. Due to asynchronous meiosis between stamens in a flower, this period may be longer than expected.

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.