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Studies on the reproductive capacity of Aesculus parviflora and Aesculus pavia: opportunities for their improvement through interspecific hybridization

Chanon, Ann Marie
http://rave.ohiolink.edu/etdc/view?acc_num=osu1118692145

Abstract Details

2005, Doctor of Philosophy, Ohio State University, Horticulture and Crop Science.
The genus Aesculus, of the family Hippocastanaceae, is comprised of thirteen species, numerous botanic varieties, cultivars, and natural hybrids. All members of this genus are valued for their ornamental flowers. This research focused on the floral, pollen, seed, and reproductive biology of Aesculus parviflora and Aesculus pavia as the foundation for the development of an Aesculus improvement project. Both species exhibited andromonecy and expressed a sex ratio of approximately 5.5%. Aesculus pavia panicles contained fewer total flowers with the complete flowers located predominately in the basal portion of the inflorescence. Whereas, the complete flowers of A. parviflora panicles were located in the upper most apical portion of the panicle. There appeared to be some plasticity in floral sex expression since mechanical modification increased the number of complete flowers per panicle. Fresh pollen of all Aesculus tested germinated at acceptable levels greater than 80% across a broad range of sucrose concentrations and temperatures. The optimal conditions for germination were 20% sucrose and 15°C. Pollen germination following storage was not impacted by storage temperature but was significantly reduced with extended storage time. Overall seed germination and emergence for both A. parviflora and A. pavia were enhanced by a 60 day stratification period at 4°C. The 60 day stratification period improved the uniformity and increased the rate of the germination and emergence while minimizing the losses due to mold. Inadequate or extended periods of stratification resulted in seed deterioration. For both A. parviflora and A. pavia, the frequency of fruit set from both self and intraspecific pollinations was equal to or somewhat better than the fruit set for naturally occurring open pollination. In all cases, the success rate of fruit set for interspecific pollinations was quite low. Further work is needed to determine the basis for this poor fuit set and to develop techniques like embryo rescue in conjunction with traditional breeding methodologies for Aesculus improvement.
Pablo Jourdan (Advisor)
326 p.
Aesculus; Bottle brush buckeye; Red Buckeye; floral biology; pollen viability; pollen storage; seed germination; seed stratification; hybridization

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Citations

  • Chanon, A. M. (2005). Studies on the reproductive capacity of Aesculus parviflora and Aesculus pavia: opportunities for their improvement through interspecific hybridization [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1118692145

    APA Style (7th edition)

  • Chanon, Ann. Studies on the reproductive capacity of Aesculus parviflora and Aesculus pavia: opportunities for their improvement through interspecific hybridization. 2005. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1118692145.

    MLA Style (8th edition)

  • Chanon, Ann. "Studies on the reproductive capacity of Aesculus parviflora and Aesculus pavia: opportunities for their improvement through interspecific hybridization." Doctoral dissertation, Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1118692145

    Chicago Manual of Style (17th edition)

osu1118692145
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This open access ETD is published by The Ohio State University and OhioLINK.