30 th Southern Tree Improvement Conference
نویسندگان
چکیده
Glutathione/ glutathione disulfide and ascorbic acid /dehydroascorbateare two major redox pairs that control the redox-state in a developing seed.Recently these redox compounds have been shown to exert strong positive effectson embryo development in several plants including white spruce. A picture isemerging that early-stage embryo development occurs best in the presence of areducing environment while late-stage development requires a shift to anoxidizing environment. Knowledge of physiological concentrations of thesecompounds during pine embryo development would allow us to better mimic theseed environment and improve somatic embryo development. Triplicate analysis for the seed redox chemicals ascorbic acid (AsA),dehydroascorbate (DHA), glutathione (GSH) and glutathione disulfide (GSSG)were completed for developmentally staged zygotic embryos and femalegametophytes over the sequence of loblolly pine (Pinus taeda L) seeddevelopment. The two trees tested generally showed similar concentrations andpatterns of change through time. The redox potential changed significantlythrough the progression of seed development. These profiles suggest that early-stage embryo development occurs best in the presence of a reducing environmentwhile late-stage development requires a shift to an oxidizing environment. Theredox chemical profiles obtained provide guidelines and targets to mimic in thetissue culture environment. Recent and ongoing tests have shown that alteration of the in vitro redoxenvironment through medium supplementation with glutathione or glutathionedisulfide during specific developmental stages can indeed enhance loblolly pinesomatic embryo development and germination.
منابع مشابه
Optimal Design of Experiments
s of the International Conference in Honor of the late Jagdish Srivastava Satellite Conference of the 58 th ISI World Statistics Congress, Dublin 2011 Vienna, Austria, September 25 th 30 th , 2011
متن کاملHierarchical Tensor Decomposition of Latent Tree Graphical Models
We approach the problem of estimating the parameters of a latent tree graphical model from a hierarchical tensor decomposition point of view. In this new view, the marginal probability table of the observed variables is treated as a tensor, and we show that: (i) the latent variables induce low rank structures in various matricizations of the tensor; (ii) this collection of low rank matricizatio...
متن کاملLong-term response of yellow-poplar to thinning in the southern Appalachian Mountains
Citation for proceedings: Holley, A. Gordon; Connor, Kristina F.; Haywood, James D., eds. 2015. Proceedings of the 17th biennial southern silvicultural research conference. e–Gen. Tech. Rep. SRS–203. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 551 p. Research Forester, USDA Forest Service, Southern Research Station, Asheville, NC 28806; and Ecologis...
متن کاملProceedings of the 12 th Conference of the European Chapter of the Association for Computational Linguistics 30
متن کامل
AOSO-LogitBoost: Adaptive One-Vs-One LogitBoost for Multi-Class Problem
This paper presents an improvement to model learning when using multi-class LogitBoost for classification. Motivated by the statistical view, LogitBoost can be seen as additive tree regression. Two important factors in this setting are: 1) coupled classifier output due to a sum-to-zero constraint, and 2) the dense Hessian matrices that arise when computing tree node split gain and node value fi...
متن کامل