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作者 Warner, Ryan Matthew
書名 Characterization and basis of high temperature inhibition of flowering
國際標準書號 0496843907
book jacket
說明 161 p
附註 Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2806
Adviser: John E. Erwin
Thesis (Ph.D.)--University of Minnesota, 2004
High temperatures reduce flowering by reducing flower initiation and inhibiting flower development, thereby reducing performance of ornamental plants and reducing yield of food crops. The objectives of this dissertation were to (1) characterize high temperature responses of several herbaceous ornamentals exhibiting reduced flowering during warm summer months, (2) identify traits associated with heat tolerance for flowering for use in screening for heat tolerance in breeding programs and (3) identify a model to study the basis of high temperature inhibition of flower development using naturally-occurring intraspecific variation. High temperature (32°C) reduced flower bud number of five herbaceous ornamentals examined, and reduced dry mass gain rate of all species except Torenia fournieri Linden ex E. Fourn (a potential model to study the basis for high temperature inhibition of flowering). Twelve Viola x wittrockiana (pansy) cultivars varied in heat tolerance for flowering and dry mass gain. Flower bud number at 30°C was positively correlated with branch number and shoot dry mass, and negatively correlated with flower diameter and root:shoot ratio, suggesting screening for these traits may aid in developing heat-tolerant pansies. Arabidopsis thaliana (L.) Heynh. was identified as a model for studying high temperature inhibition of flower development, and genotypes Col-0 and No-0 were identified as heat-tolerant and heat-sensitive, respectively. Observed differences in high temperature inhibition of flower development between Col-0 and No-0 corresponded to differences in heat-sensitive stages of floral development (early stage 12 for Col-0 and stages 9--12 for No-0). Impact of plant hormones on high temperature disruption of flower development was investigated by applying hormones and by analyzing genotypes carrying mutations for hormone biosynthesis or sensitivity. Plants carrying mutations for abscisic acid biosynthesis or sensitivity were killed by 36°C exposure for 72 h, suggesting a requirement for abscisic acid signaling in heat stress response induction. Expression of heat stress proteins and transcription factors were similar between Col-0 and No-0. These results provide a base of data on high temperature inhibition of flower development in Arabidopsis and aid in identifying floral developmental events disrupted by high temperature
School code: 0130
DDC
Host Item Dissertation Abstracts International 65-06B
主題 Biology, Plant Physiology
0817
Alt Author University of Minnesota
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