Plant Organ Abscission: From Models to CropsTimothy J. Tranbarger, Mark L. Tucker, Jeremy A. Roberts, Shimon Meir Frontiers Media SA, Nov 22, 2017 Plant organ abscission is a developmental process regulated by the environment, stress, pathogens and the physiological status of the plant. In particular, seed and fruit abscission play an important role in seed dispersion and plant reproductive success and are common domestication traits with important agronomic consequences for many crop species. Indeed, in natural populations, shedding of the seed or fruit at the correct time is essential for reproductive success, while for crop species the premature or lack of abscission may be either beneficial or detrimental to crop productivity. The use of model plants, in particular Arabidopsis and tomato, have led to major advances in our understanding of the molecular and cellular mechanisms underlying organ abscission, and now many workers pursue the translation of these advances to crop species. Organ abscission involves specialized cell layers called the abscission zone (AZ), where abscission signals are perceived and cell separation takes place for the organ to be shed. A general model for plant organ abscission includes (1) the differentiation of the AZ, (2) the acquisition of AZ cells to become competent to respond to various abscission signals, (3) response to signals and the activation of the molecular and cellular processes that lead to cell separation in the AZ and (4) the post-abscission events related to protection of exposed cells after the organ has been shed. While this simple four-phase framework is helpful to describe the abscission process, the exact mechanisms of each stage, the differences between organ types and amongst diverse species, and in response to different abscission inducing signals are far from elucidated. For an organ to be shed, AZ cells must transduce a multitude of both endogenous and exogenous signals that lead to transcriptional and cellular and ultimately cell wall modifications necessary for adjacent cells to separate. How these key processes have been adapted during evolution to allow for organ abscission to take place in different locations and under different conditions is unknown. The aim of the current proposal is to present and be able to compare recent results on our understanding of organ abscission from model and crop species, and to provide a basis to understand both the evolution of abscission in plants and the translation of advances with model plants for applications in crop species. |
Contents
Plant Organ Abscission From Models to Crops | 7 |
from models to crops | 11 |
Development and regulation of pedicel abscission in tomato | 24 |
The IDA Peptide Controls Abscission in Arabidopsis and Citrus | 30 |
Understanding the Physiology of Postharvest Needle Abscission in Balsam Fir | 37 |
Can Our Understanding of Abscission in Model Systems Promote or Derail Making Improvements in Less Studied Crops? | 48 |
AlleleSpecific Interactions between CAST AWAY and NEVERSHED Control Abscission in Arabidopsis Flowers | 56 |
Examination of the AbscissionAssociated Transcriptomes for Soybean Tomato and Arabidopsis Highlights the Conserved Biosynthesis of an Extensib... | 63 |
Genomewide digital transcript analysis of putative fruitlet abscission related genes regulated by ethephon in litchi | 139 |
Cellular and Pectin Dynamics during Abscission Zone Development and Ripe Fruit Abscission of the Monocot Oil Palm | 155 |
one more sensitive to exogenous ethylene than the other | 170 |
Burst of reactive oxygen species in pedicelmediated fruit abscission after carbohydrate supply was cut off in longan Dimocarpus longan | 180 |
Transcriptome Profiling of Petal Abscission Zone and Functional Analysis of an AuxIAA Family Gene RhIAA16 Involved in Petal Shedding in Rose | 190 |
Transcriptome Analysis of Soybean Leaf Abscission Identifies Transcriptional Regulators of Organ Polarity and Cell Fate | 203 |
Flower abscission in Vitis vinifera L triggered by gibberellic acid and shade discloses differences in the underlying metabolic pathways | 219 |
Bimodal effect of hydrogen peroxide and oxidative events in nitriteinduced rapid root abscission by the water fern Azolla pinnata | 237 |
withstanding genome duplications and gain and loss of the receptors HAEHSL2 | 78 |
De novo Transcriptome Sequencing and Development of Abscission ZoneSpecific Microarray as a New Molecular Tool for Analysis of Tomato Org... | 90 |
Distribution of XTH expansin and secondarywallrelated CesA in floral and fruit abscission zones during fruit development in tomato Solanum lycope... | 119 |
physiological fruitlet responses | 128 |
Primary and Secondary Abscission in Pisum sativum and Euphorbia pulcherrimaHow Do They Compare and How Do They Differ? | 245 |
Auxin is a longrange signal that acts independently of ethylene signaling on leaf abscission in Populus | 262 |
Back Cover | 272 |