Estimating leaf water content at the leaf scale in soybean inoculated with arbuscular mycorrhizal fungi from in situ spectral measurements

Weibao Kong ,Wenjiang Huang,Lingli Tang,Xuliang Zhou ,Hugh Mortimer,Lingling Ma,Chuanrong Li

doi:10.25165/j.ijabe.20191205.4950

Abstract

Estimating leaf water content at the leaf scale in soybean inoculated with arbuscular mycorrhizal fungi from in situ spectral measurements

Highlights

Drought stress is one of the main factors threating the agricultural development on the earth, as it limits crops growth and yield, especially in arid and semi-arid regions[1]
We explored the three types of vegetation indices (VIs) to combine the information on the raw spectral reflectance (R( )) with the November, 2019 Kong W P, et al Estimating leaf water content at the leaf scale in soybean inoculated with arbuscular mycorrhizal fungi Vol 12 No.6 151 continuum-removed spectral reflectance (RC( )) of soybean leaves, and the new VIs were formulated by Equation (3)-(5), referred to as the DVIC(λ1, λ2), NDVIC(λ1, λ2) and RVIC(λ1, λ2)
Under the other two drought stress levels, there was the opposite of the occurrence, because this period was the end of soybean growth stage, the +M plants had relatively larger leaf area compared to the CK plants, which increased the transpiration and led to the low leaf water content (LWC)

Summary

Introduction

Drought stress is one of the main factors threating the agricultural development on the earth, as it limits crops growth and yield, especially in arid and semi-arid regions[1]. About 45% land in China belongs to arid and semi-arid regions, and is expected to increase with climate change[2], which exposes soybean to drought stress. Some studies have demonstrated that arbuscular mycorrhizal fungi associates with the plant roots in such relationship enhances the plant ability of water and nutrition uptakes[1,4,5], in particular when plants suffer from drought stress[6], increasing drought resistance in plants and improve the water-use efficiency. Drought resistance in plants can occur via the maintenance of high internal water potential[7]. Leaf water content (LWC) is a suitable parameter for evaluation of plant water status and mycorrhizal effect under drought stress

Objectives

Methods

Results

Conclusion