Cold stress affects cell wall deposition and growth pattern in tobacco pollen tubes
| Autor: | Gea Guerriero, Claudia Faleri, Luigi Parrotta, Giampiero Cai |
|---|---|
| Přispěvatelé: | Parrotta, Luigi, Faleri, Claudia, Guerriero, Gea, Cai, Giampiero |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Turgor pressure Germination Plant Science Biology medicine.disease_cause 01 natural sciences Cell wall 03 medical and health sciences chemistry.chemical_compound Genetic Osmotic Pressure Pollen tube Pollen Tobacco Genetics medicine Tip growth Cellulose Fluorescent Antibody Technique Indirect Glucans Abiotic stress Cold-Shock Response Callose General Medicine Hydrogen-Ion Concentration 030104 developmental biology chemistry Biophysics Pectins Reactive oxygen specie Calcium Cold stre Reactive Oxygen Species Agronomy and Crop Science Intracellular 010606 plant biology & botany |
| Popis: | Cold is an abiotic stress seriously threatening crop productivity by decreasing biomass production. The pollen tube is a target of cold stress, but also a useful model to address questions on cell wall biosynthesis. We here provide (immuno)cytological data relative to the impact of cold on the pollen tube cell wall. We clearly show that the growth pattern is severely affected by the stress, since the typical pulsed-growth mechanism accompanied by the periodic deposition of pectin rings is absent/severely reduced. Additionally, pectins and cellulose accumulate in bulges provoked by the stress, while callose, which colocalizes with pectins in the periodic rings formed during pulsed growth, accumulates randomly in the stressed samples. The altered distribution of the cell wall components is accompanied by differences in the localization of glucan synthases: cellulose synthase shows a more diffuse localization, while callose synthase shows a more frequent cytoplasmic accumulation, thereby denoting a failure in plasma membrane insertion. The cell wall observations are complemented by the analysis of intracellular Ca 2+ , pH and reactive oxygen species (ROS): while in the case of pH no major differences are observed, a less focused Ca 2+ and ROS gradients are present in the stressed samples. The standard oscillatory growth of pollen tubes is recovered by transient changes of turgor pressure induced by hypoosmotic media. Overall our data contribute to the understanding of the impact that cold stress has on the normal development of the pollen tube and unveil the cell wall-related aberrant features accompanying the observed alterations. |
| Databáze: | OpenAIRE |
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