Allelopathic interference of plant-water relationships by para- hydroxybenzoic acid
نویسندگان
چکیده
Soybean seedlings were used as the test species to investigate the effect of phydroxybenzoic acid (pHBA) on growth and plant-water relationships. Plants were grown in nutrient solution under greenhouse conditions and were subjected to pHBA through amendments to the growth medium. Treatments were initiated 10 days after germination and continued for either 14 or 28 days with stomatal conductance, water potential, and water use monitored periodically. At harvest, effects on growth were determined and, in the 28-day study, the carbon isotope ratio (13C : 12C) of leaf tissue was analyzed as an indicator of integrated effects on plant-water status. Soybean growth was significantly reduced by 0.5 mM pHBA, or higher concentrations, with the degree of inhibition being concentration dependent. Plants treated with 0.75 mM pHBA had significantly lower stomatal conductance, lower water potential, and less discrimination against 13C. Similar trends were apparent in 0.5 mM pHBA-treated plants. Interference with plant-water balance appears to be one mechanism of action of pHBA causing a reduction in plant growth.
منابع مشابه
p-hydroxybenzoic acid inhibited photosynthetic efficiency, yield and non-photochemical fluorescence quenching in Lactuca sativa
The p-hydroxybenzoic acid (BA) is a widespread phenolic compound often cited as allelochemical [1], released into soil by root exudates of Avena fatua [2], leaf leachates, and decomposed plant tissues of Triticum aestivum L. [3]. Because of the herbicidal potential of BA on crops [4] and weed species [5], commercially available BA was tested on photosynthetic efficiency, yield and non-photochem...
متن کاملAllelochemicals in wheat (Triticum aestivum L.): cultivar difference in the exudation of phenolic acids.
Analysis by GC-MS/MS showed that a worldwide collection of 58 wheat accessions differed significantly in the amounts of 7 known phenolic acids exuded by the living roots of 17-day-old wheat seedlings. The quantities of exuded allelochemicals varied with the specific compound and ranged from 2.3 to 18.6, from 0.6 to 17.5, from 0.1 to 4.9, from 0.0 to 52.7, from 0.33 to 12.7, from 1.5 to 20.5, an...
متن کاملMetabolomics differentiation of canola genotypes: toward an understanding of canola allelochemicals
Allelopathy is one crop attribute that could be incorporated in an integrated weed management system as a supplement to synthetic herbicides. However, the underlying principles of crop allelopathy and secondary metabolite production are still poorly understood including in canola. In this study, an allelopathic bioassay and a metabolomic analysis were conducted to compare three non-allelopathic...
متن کاملPlant growth and phenolic compounds in the rhizosphere soil of wild oat (Avena fatua L.)
The objectives of this study were to determine the pattern of dry matter (DM) accumulation and the evolution of phenolic compounds in the rhizosphere soil from tillering to the ripe seed stages of wild oat (Avena fatua L.), a widespread annual grassy weed. Plants were grown under controlled conditions and harvested 13 times during the growing season. At each harvest, shoot and root DM and pheno...
متن کاملInvestigation of Allelopathic Effects of Medicago Sativa Aqueous Root Extract on Germination and Seedling Growth of Trifolium Sp and Beta Vulgaris (Case Study: Zarch Area In Yazd Province, Iran)
In natural ecosystems, biological relationships have serious effects on system stability. Allelopathic is negative or positive effect of a plant on other plant growth. Today this word is used for rangelands, same as agricultural areas. Because of good herbage production, Medicago is most common plant in agricultural rotations and rangelands. Therefore investigation of its allelopathic qualities...
متن کامل