Root Development of Bell Pepper (Capsicum annuum L.) as Affected by Water Salinity and Sink Strength.

Ran Erel,Rivka Offenbach,Amram Eshel,Ilana Shtein,Thuc T Le,Tobias Strijker,Shabtai Cohen

doi:10.3390/plants9010035

Ran Erel, Rivka Offenbach + Show 5 more

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https://doi.org/10.3390/plants9010035

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Abstract

Fruits are the dominant sinks for assimilates. At optimal conditions, assimilates supply can meet the demand of fruits and those of the vegetative organs; however, extreme circumstances such as strong sink strength or an environmental stress may disturb this fine balance. While most studies focus on aboveground parameters, information regarding root growth dynamics under variable sink strength are scarce. The objective of this study was to evaluate the effect of sink strength (represented by fruit load) and salinity on bell-pepper root development. Three levels of fruit load were combined with two salinity levels in plants grown in an aeroponic system. Root growth was determined both by root capacitance and destructive measurements. Salinity and sink strength significantly affected root, shoot and fruit growth dynamics. Root growth was less affected by fruit load. Salinity stress was negatively associated with shoot growth, but after an acclimation period, salinity enhanced root development. Additionally, this study shows for the first time that root capacitance is a valid approach for non-destructive measurement of root development in aeroponic systems. The good correlation measured by us (r2 0.86) opens new opportunities for continuous root growth monitoring in aeroponic systems in the future.

Highlights

Successful plant growth and reproduction depend on adequate partitioning of the resources among roots, shoots and reproductive organs
We found no record of the evaluation of root capacitance as a research tool in aeroponic systems
The current study focuses on root growth dynamics as far as they are influenced by fruit load in aeroponically grown bell pepper plants under two salinity levels

Summary

Introduction

Successful plant growth and reproduction depend on adequate partitioning of the resources among roots, shoots and reproductive organs. Source and sink metabolism are tightly coordinated and large fluctuations and imbalances between supply and demand are avoided [1,2,3]. At the early stages of plant development, assimilates are partitioned between shoots and roots. At maturity the fruits are the dominant sinks for assimilates, and fruit growth adds a burden on root and shoot capacity for supply of nutrients, water and photosynthates. The sink strength of a developing fruit fluctuates during growth, and the fruit growth is often characterized by a sigmoid curve [4], implying complex intra-seasonal interaction with shoot and root development dynamics.

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