Heteromannan and Heteroxylan Cell Wall Polysaccharides Display Different Dynamics During the Elongation and Secondary Cell Wall Deposition Phases of Cotton Fiber Cell Development
The roles of non-cellulosic polysaccharides in cotton fiber development are poorly understood. Combining glycan microarrays and in situ analyses with monoclonal antibodies, polysaccharide linkage analyses and transcript profiling, the occurrence of heteromannan and heteroxylan polysaccharides and related genes in developing and mature cotton (Gossypium spp.) fibers has been determined. Comparative analyses on cotton fibers at selected days post-anthesis indicate different temporal and spatial regulation of heteromannan and heteroxylan during fiber development. The LM21 heteromannan epitope was more abundant during the fibe...
Source: Plant and Cell Physiology - September 8, 2015 Category: Cytology Authors: Hernandez-Gomez, M. C., Runavot, J.-L., Guo, X., Bourot, S., Benians, T. A. S., Willats, W. G. T., Meulewaeter, F., Knox, J. P. Tags: Regular Papers Source Type: research
Loss of Arabidopsis thaliana Seed Dormancy is Associated with Increased Accumulation of the GID1 GA Hormone Receptors
Dormancy prevents seeds from germinating under favorable conditions until they have experienced dormancy-breaking conditions, such as after-ripening through a period of dry storage or cold imbibition. Abscisic acid (ABA) hormone signaling establishes and maintains seed dormancy, whereas gibberellin (GA) signaling stimulates germination. ABA levels decrease and GA levels increase with after-ripening and cold stratification. However, increasing GA sensitivity may also be critical to dormancy loss since increasing seed GA levels are detectable only with long periods of after-ripening and imbibition. After-ripening and cold st...
Source: Plant and Cell Physiology - September 8, 2015 Category: Cytology Authors: Hauvermale, A. L., Tuttle, K. M., Takebayashi, Y., Seo, M., Steber, C. M. Tags: Regular Papers Source Type: research
Loss of Arabidopsis 5'-3' Exoribonuclease AtXRN4 Function Enhances Heat Stress Tolerance of Plants Subjected to Severe Heat Stress
mRNA degradation plays an important role in the rapid and dynamic alteration of gene expression in response to environmental stimuli. Arabidopsis 5'–3' exoribonuclease (AtXRN4), a homolog of yeast Xrn1p, functions after a de-capping step in the degradation of uncapped RNAs. While Xrn1p-dependent degradation of mRNA is the main process of mRNA decay in yeast, information pertaining to the targets of XRN4-based degradation in plants is limited. In order to better understand the biological function of AtXRN4, the current study examined the survivability of atxrn4 mutants subjected to heat stress. The results indicated t...
Source: Plant and Cell Physiology - September 8, 2015 Category: Cytology Authors: Nguyen, A. H., Matsui, A., Tanaka, M., Mizunashi, K., Nakaminami, K., Hayashi, M., Iida, K., Toyoda, T., Nguyen, D. V., Seki, M. Tags: Regular Papers Source Type: research
Suppressing Sorbitol Synthesis Substantially Alters the Global Expression Profile of Stress Response Genes in Apple (Malus domestica) Leaves
In this study we used RNA sequencing (RNA-seq) profiling to characterize the transcriptome of leaves from transgenic lines of the apple cultivar ‘Greensleeves’ exhibiting suppressed expression of aldose-6-phosphate reductase (A6PR) to gain insights into sorbitol function and the consequences of decreased sorbitol synthesis on gene expression. We observed that, although the leaves of the low sorbitol transgenic lines accumulate higher levels of various primary metabolites, only very limited changes were found in the levels of transcripts associated with primary metabolism. We suggest that this is indicative of p...
Source: Plant and Cell Physiology - September 8, 2015 Category: Cytology Authors: Wu, T., Wang, Y., Zheng, Y., Fei, Z., Dandekar, A. M., Xu, K., Han, Z., Cheng, L. Tags: Regular Papers Source Type: research
Insight into a Physiological Role for the EC Night-Time Repressor in the Arabidopsis Circadian Clock
Life cycle adaptation to seasonal variation in photoperiod and temperature is a major determinant of ecological success of widespread domestication of Arabidopsis thaliana. The circadian clock plays a role in the underlying mechanism for adaptation. Nevertheless, the mechanism by which the circadian clock tracks seasonal changes in photoperiod and temperature is a longstanding subject of research in the field. We previously showed that a set of the target genes (i.e. GI, LNK1. PRR9 and PRR7) of the Evening Complex (EC) consisting of LUX–ELF3–ELF4 is synergistically induced in response to both warm-night and nig...
Source: Plant and Cell Physiology - September 8, 2015 Category: Cytology Authors: Mizuno, T., Kitayama, M., Takayama, C., Yamashino, T. Tags: Regular Papers Source Type: research
